Watts Catalogue

Select from a truly outstanding range 

of world leading products

2 

OVER 20 MANUFACTURING LOCATIONS IN EUROPE 

Watts. It’s a name you’ll recognise no matter what 

area of industry you’re involved in, and wherever 

you are situated in the world. 

And no wonder. Because as well as being around 

for over 100 years, we’ve also developed a 

reputation as a global leader in the field. 

At Watts Industries, we’re focused not only on water, 

plumbing and heating, valves and controls, but a 

great deal more. We are dedicated to developing 

the most innovative products. It’s what we 

specialise in. 

This commitment has driven the company since it 

was founded in 1874. It’s led to us firmly establishing 

ourselves as one of the world’s premier manufacturers of 

valves and controls. 

Watts has 55 facilities and 6,500 employees around the globe, with stateof-the-art 

manufacturing plants located throughout Europe, North America 

and Asia. We have also developed an impressive strategic warehousing 

and distribution network to ensure the cost-efficient distribution of our 

products to customers in a variety of industries. 

Watts – the name for quality products in the UK 

Whilst you may already have heard of our name, you might be 

surprised to discover just how extensive our capabilities are, and the 

depth of service Watts can now offer - to original equipment 

manufacturers and wholesalers in the UK. 

Over the last few years, we’ve made major 

investments to our distribution service and added 

highly respected tube manipulation and 

electronic controls companies to the Watts 

Industries UK family. 

We can now claim to offer one of the largest and 

most diverse plumbing, heating and 

water quality product lines available – 

anywhere. And we can justly claim to 

serve some of this country’s biggest 

wholesalers. 

Watts. You’re about to hear a lot more 

about us.

3 

WATTS 

THE NAME 

BEHIND A 

WORLD CLASS 

CAPABILITY 

WATTS INDUSTRIES IS FOCUSED 

ON CUSTOMER COMFORT, SAFETY 

AND PROTECTION 

WE HAVE 55 FACILITIES 

WORLDWIDE, 6500 EMPLOYEES 

AND OVER $1.2 BILLION ANNUAL 

SALES 

WE HAVE A PRODUCT PORTFOLIO 

OF MORE THAN 4000 PRODUCTS, 

WHICH ARE DISTRIBUTED 

WORLDWIDE

4 

WORLD WIDE SALES IN EXCESS OF $1.2BN 

With more than 20 Watts Industries production 

plants and sales offices throughout Europe, 

including 15 ISO-certified manufacturing facilities, 

and an annual turnover over EUR 500 Million, 

we’ve already made a big name for ourselves 

among wholesalers and OEMs across the 

continent. Now it’s time for the UK to sit up and 

really take notice. 

If you’re an OEM or a wholesaler in this country, and 

you deal with related products in any way, then the 

Watts name will be very familiar to you. 

What you probably don’t realise though is just how 

extensive our plumbing, heating and water 

quality product range is. Or precisely how much 

support we can offer in bringing you the 

specialist quality-tested solutions you need. 

Whatever your requirement, as the marketing, 

sales and distribution company for Watts Industries products within 

the UK and Ireland, we’re here to help you. 

Backflow preventers 

Watts Industries is the world leader in backflow prevention devices. 

Sanitary products 

We’re a key manufacturer and supplier of pressure reducing valves, 

thermostatic mixing valves, safety valves and safety groups. 

HVAC products 

Solar ...air conditioning...fuel and gas...if it’s a HVAC application then 

Watts has just the quality products you’re looking for. 

Our recent acquisition of Swansea-based Team Precision also 

means we now have unparalleled experience in the custom design, 

manufacture and supply of manipulated tubing. 

Instrumentation 

Plus we offer a complete range of instrumentation products.

5 

WATTS 

THE NAME FOR TRIED AND 

TRUSTED TECHNOLOGY 

• AUTOMATIC CONTROL VALVES 

• BACKFLOW-PREVENTERS 

• BALANCING AND CONTROL VALVES 

• CHECK VALVES 

• EXPANSION VESSELS 

• FILTERS AND STRAINERS 

• GAS AND FUEL VALVES 

• INSULATED PEX PIPE 

• MANIFOLDS AND FITTINGS 

• MEASURING GAUGES 

• PRESSURE REDUCING VALVES 

• RADIATOR ACCESSORIES 

• SAFETY VALVES AND UNITS 

• SHUT-OFF VALVES 

• SYSTEMS AND SYSTEM PRODUCTS 

• THERMOSTATS AND TEMPERATURE 

CONTROLLERS

6 

OVER 4,000 PRODUCT LINES AVAILABLE IN STOCK 

At Watts Industries UK we treat our relationships with 

customers as a partnership. We listen to your needs. 

We get to understand the problems and issues you 

face. And by drawing on our experience and the vast 

resources at our disposal we work closely with our 

customers to find the most effective solutions possible. 

Think of Watts. Think of the one-stop shop. 

Having recently doubled the size of our centralised storage and 

distribution facility in Evesham, we are perfectly positioned to provide 

you with the essential plumbing, heating and water quality products 

you need, fast. 

In every single way, Watts delivers. 

Watts the name for service and support 

The staff at Watts Industries UK all have a background in 

the industry and are ready to help you find the most suitable and 

cost effective solutions possible. 

We have experienced customer service specialists waiting to guide you 

through our product range and give you informed advice, whilst full 

support is available across our entire product offering with a wide 

variety of publications and CD ROMs. 

You can also be sure that the products we supply are competitively 

priced. That’s because, as a major player in the market, we are 

committed to low cost manufacturing and 

investing in product development. 

No wonder Watts is working closely 

with some of the biggest wholesalers 

and distributors in the UK.

Antipollution 

devices

ANTIPOLLUTION DEVICES 

EXAMPLE OF APPLICATION 

8 

3 

3 

2 

4 

1 

1 Backflow preventer unit. 

2 Backflow preventers with unregulated pressure zone. 

3 Anti-siphon devices. 

4 Anti-siphon devices for watering taps. 

Please note: The diagram is for illustrative purposes only; for guidance on specific applictions please refer to the 

Water Regulations Manager at your local water company.


Modern and safe solutions for our drinking water 

9 

Water is one of our most vital resources. Protecting our water 

quality is crucial to ensuring clean and safe drinking water for 

the future. 

We use and distribute our water for many different purposes 

via a public water supply network that is becoming 

increasingly more complex. Consumers from all walks of life 

are connected to this network, which entails significant 

contamination risks for water supply and distribution systems. 

A challenging environment such as this calls for innovative 

and watertight security solutions that meet today’s demands. 

A challenge that Watts Industries is fully capable of meeting. 

Public water supply network with a large number of consumers 

BA BS and BA BM: the new standard in BA drinking water protection 

Watts Industries backflow prevention devices BA 009 and BA 909 are used 

worldwide to protect public water supply systems from contamination by backflow 

of liquids in hazard category 4, as defined in EN 1717. 

To meet the new European and UR legislation and product specifications in this 

area, Watts Industries introduced the BA BS backflow prevention device in the 

dimensions DN 6, DN 8 and DN 10. The BA BS is designed specifically for low 

flow rate applications. 

With its new BA BM, in the dimensions DN 15 to DN 50 inclusive, Watts Industries 

offers a complete range of backflow prevention devices that meets the 

requirements set out in the European standards EN1717 and EN12729 for 

protection of drinking water systems from backflow.


RPZ BACKFLOW PREVENTERS – THREADED 

10 

STANDARD 

The BA BS has been developed in compliance with EN1717 and EN12729. 

Installation guidelines 

The BA BS is to be installed according to your national installation guidelines. 

BA BS material specifications 

Body 

Relief valve body 

Seal 

Tundish 

Connections 

DZR brass CW602N 

Plastic (PA) 

Rubber 

Plastic 

DZR brass 

BA BS technical specifications 

Max. system pressure PN 10 (10 bar) 

Nom. operating temp. 65°C 

Peak temperature 

90 °C for 1 hour/day 

BA BS approvals 

Kiwa, WRAS, NF, Belgaqua 

Article numbers 

Model BS DN Unit Device 

BA BS 006 6 405006311 405006010 

BA BS 008 8 405008311 405008010 

BA BS 010 10 405010311 405010010 

Overall dimensions 

BA BS pressure loss curve 

DRUKVERLIESCURVE BA BS006/008/010 

Delta P [kPa] 

DN6 

DN8 

DN10 

150 

140 

BS006 

BS008 

130 

120 

BS010 

110 

100 

90 

80 

70 

60 

50 

40 

30 

20 

10 

0 

0 0,2 0,4 0,6 0,8 1 1,2 1,4 

Flow [m3/h] 

EN12729 BS006 BS008 BS010 

Cutting edge materials and technology 

• Dezincification resistant brass (DR). 

• Piston-driven relief valve, designed to reduce breakdown and maintenance and extend 

useful life of device. The absence of a diaphragm ensures that only a small area of the 

rubber surface will come in contact with potable water, reducing potential for excess 

sediment accumulation in device. 

• A tundish, for draining out water and keeping floor dry.


RPZ BACKFLOW PREVENTERS – THREADED 

BA BM TECHNICAL SPECIFICATIONS 

The new BA BM range was developed to complement the BA BS range in order to satisfy the 

new European legislation and product specifications for backflow prevention devices that protect 

drinking water systems from backflow of liquids in hazard category 4, as defined in EN1717. 

11 

Standard 

The BA BM is developed in accordance with EN1717 and EN12729. 

Installation guidelines 

The BA BM is to be installed according to your national installation guidelines. Valve supplied as 

either a unit which includes strainer and isolating ball valves or as a device which is the valve on 

its own. Valves must be tested on an annual basis by a qualified tester. www.wras.co.uk 

Overall dimensions 

BA BM Unit 015 020 025 032 040 050 

Connections (male) R inch ½” ¾” 1” 1 ¼” 1 ½” 2” 

Tundish connection (female) D mm 32 32 40 40 50 50 

Overall length excl. connections L1 mm 122 122 157 157 220 220 

Overall length incl. connections L2 mm 201 201 252 252 336 336 

Height H1 mm 168.5 168.5 238 238 303.5 303.5 

Height H2 mm 103 103 156 156 202.5 202.5 

Height H3 mm 65.5 65.5 82 82 101 101 

Width W mm 53 53 76 76 115 115 

Weight, incl. connections L kg (+/-) 1,2 1,2 2,7 2,7 6,5 6,5 

and tundish 

STR 

BA BM material specifications 

Body 

Relief valve body 

1st and 2nd check valve module 

Seal 

Tundish 

Connections 

DZR brass CW602N 

Plastic (PA) 

Plastic (POM) 

Rubber 

Plastic 

DZR 

Stop Strainer BA device Stop valve 

valve 

with tundish 

BA BM technical specifications 

Max. system pressure 

PN 10 (10 bar) 

Nom. operating temperature 65°C 

Peak temperature 

90°C for 1 hour/day 

BA BM Approvals 

Kiwa, WRAS, DVGW, NF, Belgaqua 

Delta P [kPa] 

150 

140 

130 

120 

110 

100 

90 

80 

70 

60 

50 

40 

30 

20 

10 

0 

BA BM pressure loss curve 

DRUKVERLIESCURVE BA BS006/008/010 

DN6 

0 0,2 0,4 0,6 0,8 1 1,2 1,4 

Flow [m3/h] 

DN8 

BS006 

DN10 

BS008 

BS010 

Article numbers 

Model BM DN Unit Device 

BA BM 015 15 405015311 405015310 

BA BM 020 20 405020311 405020310 

BA BM 025 25 405025311 405025310 

BA BM 032 32 405032311 405032310 

BA BM 040 40 405040311 405040310 

BA BM 050 50 405050311 405050310 

EN12729 BS006 BS008 BS010


RPZ BACKFLOW PREVENTERS – THREADED / FLANGED 

12 

RPZ 009 – PROTECTION BA 

Backflow preventer designed to protect potable water supplies in accordance with national 

plumbing regulations and water company requirements up to Fluid Category 4. 

Comprising two in-line, independent check valves, captured springs and replaceable check 

seats with an intermediate relief valve in a bronze body, supplied with Y type strainer and two 

isolating ball valves, with screwed BSP female end connections. 

Max. operating pressure 12 bar. Operating temperature range 1ºC to 80ºC. 

Type Part number Size body Box Qty 

RPZ009 EDP0062095 1/2” 1 

RPZ009 EDP0063031 3/4” 1 

RPZ009 EDP0063021 1” 1 

RPZ009 EDP0062950 1-1/4” 1 

RPZ009 EDP0062952 1-1/2” 1 

RPZ009 EDP0063011 2” 1 

Tundishes to suit above valves 


Tundish EDP0881399 1/2”-3/4” 1 

Tundish EDP0881376 1”-1 1/2” 1 

Tundish EDP881378 2”-3” 1 

RPZ 909 – PROTECTION BA 

Backflow preventer designed to protect potable water supplies in accordance with national 

plumbing regulations and water company requirements up to Fluid Category 4. 

Comprising two in-line, independent check valves, captured springs and replaceable check 

seats with a high discharge capacity relief valve in an epoxy coated cast iron body, flanged 

PN10 end connections. 

Max. operating pressure 12 bar. Operating temperature range Min. 1ºC to Max. 60ºC. 


RPZ909 EDP385943 2-1/2” 1 

RPZ909 EDP385945 3” 1 

RPZ909 EDP385934 4” 1 

RPZ909 EDP385935 6” 1 

RPZ909 EDP385596 8” 1 

RPZ909 EDP385615 10” 1 

Tundishes to suit above valves 


Tundish EDP881378 2”-3” 1 

Tundish EDP0881385 4”-10” 1


BA BACKFLOW PREVENTER TEST KITS 

TK99D DIGITAL 

Differential electronic pressure gauge for monitoring differential pressures and checking for 

correct operation of BA backflow preventers during normal yearly maintenance. Compact and 

practical device, easy to use. Maximum accuracy in measurement (error 0.25%) with reading of 

data on liquid crystal display. Indicator of battery consumption and automatic stop of the gauge 

after 15 minutes of non-use. High impact and water-tight ABS case. Corrosion-resistant 

stainless steel needle valves, with interchangeable seats. Stainless steel (316) protection 

strainer (100µ). 

Max. pressure: 14 bar. Max. temperature: 99°C. 

Complete with brass fittings and adapters. 

Three flexible pipes, size 91cm, in different colours and with Female Flare fittings. 

Supplied with two alkaline batteries type C to ensure a back-up time of 400 running hours. 

13 

Type Part number Box Qty 

TK-99D PSI EDP385516 1 

TK-99D KPA EDP385518 1 

Carry case EDP0385508 1 

TK-9A MECHANICAL 

Mechanical differential pressure gauge for monitoring differential pressures and checking for 

correct operation of BA backflow preventers during normal yearly maintenance. 

Compact and portable device. 

Max. pressure: 12 bar. Max. temperature: 100ºC. 

Gauge diameter 100mm range 0 –15 psid and 0 – 1 bar with a ± 2% accuracy full scale. 

Three Flexible hoses, 1 metre long, colour coded with Female Flare fittings. 

The unit is supplied with a rugged, lightweight, shock resistant carrying case. 

Type Part number Box Qty 

TK-9A EDP385496 1 

BACKFLOW PREVENTER, ANTI-SIPHON VACUUM BREAKER DEVICES 

TYPE CA 

Backflow preventer, non-verifiable disconnecter with different pressure zones, built-in filter. 

WRAS approved to Category 3. Commonly used to directly connect appliances such as 

domestic heating boilers up to 45 kW permanently to a mains supply. DZR brass body, EPDM 

diaphragm with stainless steel internals. Female union ends. 

Max. operating pressure: 10 bar. Operating temperature range: Min. 1ºC Max. 65ºC. 

Protection : CA 

According to WRAS, KIWA-NL, ANSEAU, ASSE, CSA. 

WRAS approval applies to part numbers 30215, 30115 and 30138. 


Plain brass + air gap 30115E 1/2” 1 

Nickel plated + air gap 30157 1/2” 1 

Plain Brass + air gap 30215 3/4 1


DOUBLE / SINGLE CHECK VALVES 

14 

DOUBLE CHECK VALVES 

DZR brass body with copper compression and screwed BSP female end connections. 


Copper compression 107207 15 mm 25 




Screwed ends M10603 1/2” 25 


Screwed ends M10605 1” 25 

Screwed ends M10606 1-1/4” 25 



WRAS approval applies to screwed valves only 

SINGLE CHECK VALVES 

Brass body with copper compression and screwed BSP female end connections. 


Copper compression M10500 15 mm 25 










NN & NR 

Check valve with low opening pressure and protection against water hammer. Silent operation 

thanks to double guided pin-plug. Replaceable plastic insert check. NBR seals. Stainless steel 

spring. Chrome plated brass body. 

Type NN – flow direction from male to female thread. 

Type NR – flow direction from female to male thread. 

Max. operating pressure: 16 bar. Max. operating temperature: 100ºC. 


NN 230015165 1/2” 25 

NN 230020165 3/4” 25 

NR 235015165 1/2” 25 

NR 235020165 3/4” 25


CAST IRON CHECK VALVES 

FC 

Spheroidal cast iron check valve with flanged connections. 

Check function controllable according to EN 13959. 

Field of application : 

• as anti-pollution device in drinking water supply with EA protection according to EN1717. 

• as non-return (check) valve in all hot and cold domestic water supply circuits, in distribution 

networks of fluid operating in the systems, in pumping stations, etc. 

Operating pressure: 16 bar. 

Max. temperature: 70°C. 

Min. temperature: 4°C. 

Spheroidal cast iron body. 

Elastomeric parts: NBR. 

Other components stainless steel. 

Approvals : Belgaqua. WRAS 

WRAS approval requires horizontal installation, cold water only. 

15 


FC 308065361 65 mm 1 

FC 308080361 80 mm 1 

FC 308100361 100 mm 1 

FC 308125361 125 mm 1 

FC 308150361 150 mm 1 

FC 308200361 200 mm 1 

FC 308250361 250 mm 1 

FC hydraulic characteristic

Pressure 

reducing valves

PRESSURE REDUCING VALVES 

COMPRESSION / FEMALE 

18 

DRV/E-COMPRESSION 

Diaphragm pressure reducing valve, compact design. Brass CW602N body (anti-dezincification 

alloy), with male connections complete with swivel nut: Pipe dia. 15 and 22. Gauge connection 

1/4". Max. upstream pressure: 25 bar. Adjustable downstream pressure: 1.5 – 6 bar. Max. fluid 

temperature: 30°C. Can be used for water, compressed air. Mounting in any position. 

WRAS approved cold water. 


DRV/E 0502115 15mm 10 

DRV/E 0502120 22mm 10 

DRVE 

Single seated pressure reducing valves with female connections. Brass CW617N body. 

High impact plastic cap. Max. inlet pressure: 25 bar. Adjustable downstream pressure: 

1.5 – 6 bar. Diaphragm pressure reducing valve, compact design. Brass CW617N body. 

Max. upstream pressure: 25 bar. Adjustable downstream pressure: 1.5 – 6 bar. 

Max fluid temperature: 30°C 


DRVE 0502020 3/4” F/F 1 

REDUFIX 

Diaphragm pressure reducing valve, designed for protecting electrical heating appliances or 

appliance for domestic hot water production. Anti-dezincification (anti-corrosion) brass body, 

especially suitable for single users. Gauge connection 1/4" female. Can be installed in all 

positions. Max. upstream pressure: 15 bar. Max. temperature: 70°C. 

WRAS approval applies to part numbers 82000, 82110, 82007, 82009, 82009BR, 82114 and 

82115. 

Type Part number Factory set @ Size body Box Qty 

REDUFIX 82000 4 bar 1/2" F/F 25 

REDUFIX 82005 3.5 bar 1/2" F/F 25 

REDUFIX 82006 2 bar 1/2" F/F 25 

REDUFIX 82007 3 bar Dual 3/4" M/M & 1/2" F/F 25 

REDUFIX 82110 3 bar 3/4" M/M 25 

REDUFIX 82210 4 bar 3/4" M/F union nut 25 

REDUFIX 82212 3 bar 3/4" M/F union nut 25 

REDUFIX 82213 3.5 bar 1/2" M/F 25 

MINIBRASS 

Piston operated pressure reducing valve with NBR seat and brass body and internal parts. Can 

be used on clean water, compressed air and diesel oil up to 60˚C. Maximum inlet pressure 15 

bar. Max. temperature 80˚C. Type 102/103 without gauge port. Type 106/109 with gauge port 


MINIBRASS 102 102F/F15 1/2” F/F 10 



MINIBRASS 109 109F/F20 3/4” F/F 10


FEMALE 

REDUPRESS 

Diaphragm pressure reducing valve, compact design. DZR brass body with two gauge 

connections 1/4" female. Min. temperature 1ºC. Max. temperature 80ºC. High pressure model: Max. 

upstream pressure 16 bar. Min. outlet pressure: 1.5 bar. Max. outlet pressure: 5.5 bar. Low Pressure 

model: Max. upstream pressure 8 bar. Min. outlet pressure: 0.5 bar. Max. outlet pressure: 2.5 bar. 

19 

BY-PASS 

Type Part number Presssue Range Size body Box Qty 

REDUPRESS 81106 Low Pressure 1/2” F/F 20 

REDUPRESS 81100 High Pressure 3/4” F/F 20 

REDUPRESS 81103 Low Pressure 1” F/F 20 

REDUPRESS 81116 High Pressure 1-1/4” F/F 20 

REDUPRESS 81200 Fixed @ 3.5 bar 1-1/2” F/F 20 

U5B 

EXPANSION 

WRAS approval applies to part numbers 81100, 81015, 81113, 81106, 81116 and 81200. 

Diaphragm pressure reducing valve. Watts U.S. Patent N° 3. 115. 154. Heavy duty bronze 

series, with large built-in filter and separate connection for quick maintenance. Internal by-pass 

for upstream discharge of any downstream overpressures. Bronze body, cast iron cap. 

Stainless steel filter and seat. Diaphragm made of Nordel reinforced with Nylon fibres. Max. 

inlet pressure: 20 bar. Adjustable downstream pressure: 1.5 – 5 bar. Can be used for water, air 

and neutral gases up to 71°C. 


U5B EDP0052979 1/2” F/F 1 

U5B EDP0059879 3/4” F/F 1 

U5B EDP0053200 1” F/F 1 

U5B EDP0054140 1-1/4” F/F 1 

U5B EDP0054358 1-1/2” F/F 1 

U5B EDP0059883 2” F/F 1 

PRECISIO 

Bracketed diaphragm pressure reducing valve; complete with 2 pressure gauge connections 1/4" 

female. Reduces the pressure without lowering the flow rate. Rugged and reliable unit not requiring 

maintenance. Complies with comfort and acoustic standards. Plug connected to diaphragm 

through bracket. Pressure set through PHILLIPS screw. Its compact size allows interchangeability 

with most of the pressure reducing valves on the market. Brass DZR (corrosion-resistant) body. 

Max. inlet pressure: 16 bar. Adjustable downstream pressure: 1.5 to 5.5 bar. 

Max. operating temperature: 80°C. 


PRECISIO 86201 1/2” F/F 1 

PRECISIO 86200 3/4” F/F 1 

PRECISIO 86211 3/4” M/M 1 

PRECISIO 86210 3/4” M/M 1 

PRECISIO 86215 3/4" Female swivel x Male 1 

Pressure reducing valves covered by WATTS US PATENT N° 3,115,154 

UPSTREAM 

PRESSURE 

REDUCED PRESSURE 

PROTECTIVE BY-PASS 

PLUG 

UPSTREAM 

DOWNSTREAM 

UPSTREAM 

DOWNSTREAM 

ABSENCE OF FLOW 

ABSENCE OF FLOW 

DOWNSTREAM PRESSURE TENDS TO FALL 

DOWNSTREAM PRESSURE TENDS TO RISE


FEMALE 

20 

SERIES 223 

Pressure reducing valve with highly sensitive spring and large diaphragm that permits accurate 

adjustment. High temperature diaphragm for both hot and cold water. Bronze body screwed 

BSP female, stainless steel seat. Max. upstream pressure: 20 bar. Adjustable downstream 

pressure: 1.5 – 6.0 bar. Min. temperature 1ºC. Max. temperature 70ºC. 

Upon request available with Low and High Pressure versions. 


223 EDP296239 1/2” F/F 1 

223 EDP296155 3/4” F/F 1 

223 EDP296603 1” F/F 1 

223 EDP296865 1-1/4” F/F 1 

223 EDP296154 1-1/2” F/F 1 

223 EDP297448 2” F/F 1 

223 EDP305735 2-1/2” F/F 1 

223 EDP303646 3” F/F 1 

SERIES SS-263AP 

Compact stainless steel pressure reducing valve for deionised water purification, chemical 

handling, high purity, water purification systems and low pressure steam 15 psi (1.0 bar) 

applications. Rugged investment cast stainless steel body and spring cage, with gauge 

connection 1/4" female, stainless steel adjusting screw, oversized orifice. End connection 1/2" 

NPT female. Max. upstream pressure: 28 bar. Min. temperature 0.5ºC. 

Max. temperature 49ºC. 

Upon request available with Viton Seals. 

Type Part number Outlet presssure range Supplied set at Box Qty 

SS-263AP EDP0335115 1 – 25 psi 10 psi 1 




SERIES P50/P60 

Miniature pressure reducing valve in corrosion proof acetal plastic, all internal metal 

components in contact with the fluid are stainless steel. P50 – Multi-purpose pressure regulator 

for general use. P60 – Balanced piston design for applications where constant downstream 

pressure and accurate flow performance are required. Connections 1/4" BSP female. 

Max. upstream pressure: 21 bar. Min. temperature 5ºC. Max. temperature 66ºC. 

Type Part number Outlet presssure range Supplied set at Box Qty 

P50 EDP0354551 0 – 25 psi 15 psi 1 

P50 EDP0354552 0 – 60 psi 40 psi 1 

P50 EDP0354553 0 – 125 psi 50 psi 1 

P60 EDP0354554 0 – 25 psi 15 psi 1 

P60 EDP354555 0 – 60 psi 40 psi 1 

P60 EDP354556 0 – 125 psi 50 psi 1 

P60 4WAY EDP354591 0 – 60 psi 40 psi 1 

P60 4WAY EDP354592 0 – 125 psi 50 psi 1


UNION 

DRV 

Diaphragm pressure reducing valve with compensated seat and complete with unions. 

Brass CW617N body and cap. Stainless steel strainer. 1/2" - 3/4" - 1" = 600 µ 

1 1/4" - 1 1/2" - 2" = 750 µ. Plastic valve seat. Interchangeable filter-regulator unit. 

Max. inlet pressure: 25 bar. Adjustable downstream pressure: 1.5 - 6 bar. Can be used for 

water, air and neutral gases up to 30°C. Pressure drops less than 1.3 bar at characteristic flow 

rate DIN. Noise < 20 dB – Class 1 in Germany. 

21 


DRV 0501115 1/2” M/M 10 

DRV 0501120 3/4” M/M 10 

DRV 0501125 1” M/M 10 

DRV 0501132 1 1/4” M/M 1 

DRV 0501140 1 1/2” M/M 1 

DRV 0501150 2” M/M 1 

DRVN 

Patented diaphragm pressure reducing valve with compensated seat, outlet pressure 

adjusting knob and external graduated scale for easy reading of set pressure. 

Complete with unions. Body and cap of shot-blasted stamped brass CW617N. 

Stainless steel filter cartridge. Pressure gauge connection on both sides: 1/4". 

Materials in contact with fluids KTW certified. Max. inlet pressure: 25 bar. 

Adjustable downstream pressure: 1.5 and 6 bar. Max. operating temperature: 30°C. 

Can be used for water, air and neutral gases. Noise < 20 dB – Class 1 in Germany. 

According to DVGW. 


DRVN 0502515 1/2” M/M 10 

DRVN 0502520 3/4” M/M 10 

DRVN 0502525 1” M/M 10 

DRVN 0502532 1 1/4” M/M 1 

DRVN 0502540 1 1/2” M/M 1 

DRVN 0502550 2” M/M 1 

Cavitation diagram for pressure reducing valves series 

DRV 

CAVITATION 

The cavitation diagram shows three operating zones of the pressure reducing valve 

plotted against the upstream and downstream pressures, namely: 

Zone C: normal duty, no cavitation 

Zone B: medium duty, risk of cavitation 

Zone A: heavy duty, the pressure reducing valve shows cavitation. 

Continuous operation in the red cavitation zone could cause rapid damage of the 

internal parts. 

SIZING 

Example 1 (cavitation) 

Pressure reducing valve with: Inlet pressure P1 = 14 bar. Outlet pressure P2 = 3 bar. 

From the cavitation diagram it can be seen that the pressure reducing valve is 

constantly working in the red zone. To avoid rapid deterioration, two pressure 

reducing valves could be used, one connected upstream to the other. 

Upstream pressure reducing valve: pressure front from 14 to 6 bar (green zone). 

Downstream pressure reducing valve: pressure front from 6 to 3 bar (green zone). 

A Cavitation zone B Transition zone C Work zone 

20 

(bar) 

Inlet pressure 

18 

16 

14 

12 

10 

8 

6 

4 

A 

B 

C 

2 

0 

0 1 2 3 4 5 6 7 

Downstream pressure 

(bar)


UNION 

22 

MOV809T-143 

Pressure reducing valve brass body and diaphragm, stainless steel seat, NBR O-rings, two 

gauge connections 1/4" BSP female. Max. upstream pressure: 20 bar. Adjustable downstream 



809T-143 M11200 1/2” F/F 1 

809T-143 M11201 3/4” F/F 1 

MOV809T-146 

Pressure reducing valve brass body and diaphragm, stainless steel seat, NBR O-rings, two 

gauge connections 1/4" BSP female. Max. upstream pressure: 20 bar. Adjustable downstream 



809T-146 M11300 1/2” F/F 1 

809T-146 M11301 3/4” F/F 1 

809T-146 M11302 1” F/F 1 

809T-146 M11303 1-1/4” F/F 1 

809T-146 M11304 1-1/2" FF 1 

809T-146 M11305 2" FF 1


FLANGED 

PR500 

23 

The pilot operated reducing valve PR500 reduces a higher upstream pressure to 

a constant lower downstream pressure. This very accurate valve is designed to 

operate with a minimum of maintenance. The only moving parts in the valve are 

the diaphragm and the stem assembly, which are guided by an exchangeable 

bearing in the cover and the valve seat. The Watts PR500 is easy to install and 

adjust. It is available with flanges (DN50 - DN250). 

5 

2 

3 

6 

4 

No. Name 

1 Body/main valve 

2 Fixed orifice 

3 Flow strainer 

4 Pilot valve 

5 Air vent 

6 Flexible tubing 

Dimensions 

1 

A 

C1 

C2 

Δ P in bar 

10.0 

1.0 

Pressure Loss Curve 

65 100 150 250 350 500 

125 400 600 

50 80 200 300 

Cavitation Curve 

Inlet pressure (bar) 

25.0 

20.0 

15.0 

A 

B 

10.0 

C 

B2 

B1 

0.1 

10 100 1000 10000 

Q (quantity in m 3 /h) 

5.0 

maximum velocity: 4,3 m/s 

0.0 

0 1 2 3 4 5 6 7 

Outlet pressure (bar) 

A Cavitations 

B Possible cavitations 

C No cavitations 

DN PN A B1 B2 C1 C2 Kg 

50 10/16 230 160 85 165 85 20 

65/60 10/16 290 170 85 165 95 25 

80 10/16 310 175 85 165 100 30 

100 10/16 350 190 120 210 110 40 

125 10/16 400 200 150 285 125 70 

150 10/16 480 210 150 285 145 90 

DN PN A B1 B2 C1 C2 Kg 

200 10 600 235 200 360 170 150 

200 16 600 235 200 360 170 150 

250 10 730 280 255 475 200 400 

250 16 730 280 255 475 200 400 

Max. temperature: 70˚C continuous 

WRAS approval applies on sizes up to and including DN250 for above ground applications on 

water systems to a maximum 20ºC. 

Type Part number Size body PN Box Qty 

PRV500 500050549 50 10/16 1 

PRV500 500065549 65 10/16 1 

PRV500 500080549 80 10/16 1 

PRV500 500100549 100 10/16 1 

PRV500 500125549 125 10/16 1 

PRV500 500150549 150 10/16 1 

PRV500 500200549 200 10 1 

PRV500 505200549 200 16 1

Boiler 

components

BOILER COMPONENTS 

SAFETY VALVES 

26 

MSL 

Normal type diaphragm safety valve. Brass CW617N body. Plastic manual discharge knob. 

Ni-Cr steel spring. Operating temperature range: -10°C to 110°C. Also with glycol: 50%. 

1/2" M/F connections. 

MSL at 3 bar according to UDT and is AFNOR, CSTB approved. According to Directive 

PED 97/23/CE. Identification number CE1115. 

Type Part number Size body bar Box Qty 

MSL 0206115 1/2" 1,5 40 

MSL 0206525 1/2" 2,5 40 

MSL 0206530 1/2" 3 40 

MSL 0206540 1/2" 4 40 

MSL 0206150 1/2" 5 40 

MSL 0206160 1/2" 6 40 

MSL 0206170 1/2" 7 40 

MSL 0206180 1/2" 8 40 

MSL 0206190 1/2" 9 40 

MSL 0206199 1/2" 10 40 

MSV 

Like MSL but with 1/2" female connections. 


MSV 0207110 1/2" 1 40 

MSV 0207115 1/2" 1,5 40 

MSV 0207525 1/2" 2,5 40 

MSV 0207530 1/2" 3 40 

MSV 0207540 1/2" 4 40 

MSV 0207150 1/2" 5 40 

MSV 0207160 1/2" 6 40 

MSV 0207170 1/2" 7 40 

MSV 0207180 1/2" 8 40 

MSV 0207190 1/2" 9 40 

MSV 0207199 1/2" 10 40 

NEW 

FOR SOLAR SYSTEMS 

SVE-SOL 

Diaphragm safety valve for solar systems. Body of brass CW617N, EN 12165-99. 

Elastomeric diaphragm. Discharge pressure factory set and with sealed knob. 

Suitable for water, also water mixtures (glycol up to 50%) as according to DIN 4757 Part 1. 

Max operating temperature: 160°C. 

TÜV SOLAR certified. According to Directive PED 97/23/CEE. 

Identification number CE1115. 


SVE-SOL 0215835 1/2" x 3/4" 3,5 40 

SVE-SOL 0215840 1/2" x 3/4" 4 40 

SVE-SOL 0215860 1/2" x 3/4" 6 40 

SVE-SOL 0215880 1/2" x 3/4" 8 40 

SVE-SOL 0215899 1/2" x 3/4" 10 40


SAFETY VALVES 

SV 

Normal type diaphragm safety valve. Brass CW617N body. Plastic manual discharge knob. 

Ni-Cr steel spring. Diaphragm and seals of rubber resistant to 140°C. Female connections 

with reinforced outlet. 

TÜV/TSUP approved. According to Directive PED 97/23/CE. 

Identification number CE1115. 

27 


SV 0216115 1/2" x 3/4" 1,5 40 

SV 0215125 1/2" x 3/4" 2,5 40 

SV 0215130 1/2" x 3/4" 3 40 

SV 0215104 1/2" x 3/4" 4 40 

SV 0216105 1/2" x 3/4" 5 40 

SV 0216106 1/2" x 3/4" 6 40 

SV 0216107 1/2" x 3/4" 7 40 

SV 0216108 1/2" x 3/4" 8 40 

SV 0216110 1/2" x 3/4" 10 40 

SV 0217215 3/4" x 1" 1,5 40 

SV 0217625 3/4" x 1" 2,5 40 

SV 0217630 3/4" x 1" 3 40 

SV 0217604 3/4" x 1" 4 40 

SV 0217205 3/4" x 1" 5 40 

SV 0217206 3/4" x 1" 6 40 

SV 0217207 3/4" x 1" 7 40 

SV 0217208 3/4" x 1" 8 40 

SV 0217210 3/4" x 1" 10 40 

SV 0218615 1" x 1 1/4" 1,5 40 

SV 0218625 1" x 1 1/4" 2,5 40 

SV 0218630 1" x 1 1/4" 3 40 

SV 0218604 1" x 1 1/4" 4 40 

SV 0218305 1" x 1 1/4" 5 40 

SV 0218606 1" x 1 1/4" 6 40 

SV 0218607 1" x 1 1/4" 7 40 

SV 0218608 1" x 1 1/4" 8 40 

SV 0218610 1" x 1 1/4" 10 40 

SV 0219615 1" x 1 1/4" 1,5 40 

SV 0219625 1" x 1 1/4" 2,5 40 

SV 0219630 1" x 1 1/4" 3 40 

SV 0219604 1" x 1 1/4" 4 40 

SV 0219405 1" x 1 1/4" 5 40 

SV 0219606 1" x 1 1/4" 6 40 

SV 0219607 1" x 1 1/4" 7 40 

SV 0219608 1" x 1 1/4" 8 40 

SV 0219610 1" x 1 1/4" 10 40 

MSM/MSML 

Like MSV with BSP connections. Set at 3.0 bar with gauge port. Supplied with and 

without gauge. 


MSML30 C/W GAUGE 0210430 1/2"M x 1/2”F 60 

MSM30 C/W GAUGE 0210130 1/2"F x 1/2”F 60 

MSML/E - NO GAUGE 0210530 1/2"F x 1/2”F 100


PRESSURE AND TEMPERATURE RELIEF VALVES – 684 

28 

P&T – PRESSURE AND TEMPERATURE RELIEF VALVES 

The valve stem is not in brass as 

other valves on the market, but made 

of PA6.6 fibreglass and reinforced high 

resistance polymer. 

This synthetic material presents 

exceptional mechanical resistance, 

and it is largely used in water meters 

and valves. 

100% recyclable, PA6.6 is particularly 

appreciated by leading-edge industries 

for its endurance, insulation, and total 

absence of corrosion. This ensures 

reliable operation even in a corrosive 

atmosphere (ie close to the sea) or with 

an outside installation such as a roof top, 

and avoids any risk of binding or locking. 

Robust and low complexity construction 

providing superior reliability and longevity. 

Dezincification resistant brass housing. 

The control knob, made of PA6GF 

instead of a lever type valve, is more 

aesthetic and with a modern design to 

complement the finish of today’s systems. 

The pressure relief function is reliable and 

guaranteed by both European ISO9001 

production and a wealth of experience 

gained in its different world markets. 

The diaphragm is in EPDM and for 

sanitary use. This piece is cast solid and 

the brass insert is vulcanized with the 

rubber diaphragm, providing better 

reliability and no risk of leakage. 

The probe is hung by a innovative 

attachment unit. 

The probe is accurate and proven. 

Exclusively designed and manufactured 

by Watts Industries. 

Installation example 

Approval 

WRAS N°1003045 

Discharge rating 

1/2” and 3/4” Ø 15: 10kW 

3/4” Ø 22: 25kW 

Technical specifications 

Pressure opening 

3-4-6-7-10 bar 

Temp. opening 92°C 

Medium 

Sanitary water 

Nominal pressure PN 10 

Material specifications 

Body 

Spring 

Control knob 

Diaphragm 

DZR Brass 

Steel 

PA6 GF 

EPDM


PRESSURE AND TEMPERATURE RELIEF VALVES – 684 

SELF-CLOSING P&T RELIEF VALVES FOR WATER HEATERS 

29 

The combined 2 in 1 P&T relief valve provides the least expensive and proven 

means for protection against both excessive pressure and temperature emergency 

conditions. Provides fully automatic pressure and temperature relief protection for hot water 

storage tanks and heaters. 

Application 

Fully automatic pressure and temperature relief protection for domestic hot water 

supply tanks and heaters. 

Correct installation 

HOT WATER 

STORAGE 

HEATER 

Incorrect installation 

HOT WATER 

STORAGE 

HEATER 

HOT WATER 

STORAGE 

HEATER 

Typical installation 

Please refer to local Regulation. 

• All recognized codes require that a temperature actuated relief valve be installed on a 

storage water heater, generally in such a manner that the temperature sensing element is in 

contact with hot water in the top 6 inches (152mm) of the tank. 

• A drain line must be fitted to each P&T valve. 

• The drain line should discharge into a floor drain, check to see that a discharge line is 

connected to this valve directing the flow of hot water from the valve to a proper place of 

disposal otherwise personal injury may result. 

• The drain pipe from the P&T must discharge through a tundish, to a safe and visible position 

to alert the householder of a fault condition with the system. 

• The P&T relief valves must be installed by qualified technical plumbers in accordance with 

current regulations. 

• The P&T relief valve must be installed observing the direction of flow indicated by the arrow 

on the valve body. 

• The 684 P&T relief valves can be fitted vertically or horizontally, but not inverted. 

Features 

• These P&T valves feature a unique probe with special thermo-bonded coating. 

Thermostat is accurate and proven. 

• Exclusively designed and manufactured by Watts Industries. 

• Temperature nominal setting: 92°C, the valve opens between 89°C and 95°C. 

• The European Standard EN 1490: 2000, entitled “Building valves – Combined pressure and 

temperature relief valves – Tests and requirements”, describes the constructional and 

performance specifications that P&T relief valves must have. 

• The Watts Industries series 684 P&T relief valves are certified to comply with the 

requirements of this European Standard EN 1490 (for settings 4 – 7 – 10 bar).


PRESSURE RELIEF VALVES AND COMMERCIAL SAFETY RELIEF VALVES 

30 

P&T – PRESSURE AND TEMPERATURE RELIEF VALVES 

Fully automatic temperature and pressure relief valve. Protection for domestic installations of 

unvented water heaters, to prevent the temperature of water exceeding 100ºC. Pressed DZR 

brass body BSP threads. EPDM diaphragm. Temperature setting 92ºC. 

WRAS approved, please contact to confirm part number. 

Setting Part number Size Ø inlet – outlet ND 

7 bar 68400 M 1/2” – comp.15mm 1/2” 

10 bar 68401 M 1/2” – comp.15mm 1/2” 

7 bar 68402 Comp.15 mm – comp.15 mm 1/2” 

7 bar 68403 M/F 1/2” 1/2” 

10 bar 68404 M/F 1/2” 1/2” 

3 bar 68450 M/F 3/4” 3/4” 

4 bar 68451 M/F 3/4” 3/4” 

6 bar 68452 M/F 3/4” 3/4” 

7 bar 68453 M/F 3/4” 3/4” 

7 bar 68454 M/F 3/4” – 9” probe 3/4” 

10 bar 68455 M/F 3/4” 3/4” 

7 bar 68456 M 3/4” – comp. 15 mm 3/4” 

10 bar 68457 M 3/4” – comp. 15 mm 3/4” 

7 bar 68458 M 3/4” – comp. 22 mm 3/4” 

10 bar 68459 M 3/4” – comp. 22 mm 3/4” 

SERIES 174A SAFETY RELIEF VALVE 

Bronze body safety relief valve for all types of hot water boiler equipment with manual lever. 

Pressure range 30 to 150 psi (2 to 10 bar). Operating temperature range Min. 1ºC Max. 

140ºC. Bronze body screwed BSP Female. Stainless steel spring. Teflon seat (avoids 

sticking). EPDM membrane. Available to order – other set pressures. 

Pressure Part number Size body Box Qty 

3 bar EDP279030 3/4” 1 

7 bar EDP279070 3/4” 1 

3 bar EDP279150 1” 1 

7 bar EDP279190 1” 1 

3 bar EDP279220 1-1/4” 1 

7 bar EDP279250 1-1/4” 1 

3 bar EDP276487 1-1/2” 1 

7 bar EDP276490 1-1/2” 1 

3 bar EDP279320 2” 1 

7 bar EDP279370 2” 1 

N36 VACUUM RELIEF VALVE 

Water services vacuum relief valve. Automatically vents a closed system if vacuum occurs. 

Relieves vacuum conditions which would siphon the water from the system and burn out a 

water heater or collapse a tank. 

Max. operating pressure: 13.8 bar. Max. operating temperature: 121ºC. 

Venting capacity 425 litres/min (air). 


N36 EDP138457 1/2" NPT 1 

N36 EDP0138458 3/4" NPT 1


AUTOMATIC FILLING VALVES AND RELIEF VALVES 

AL 

ALIMAT 

Automatic filling valve complete with check valve, manual shut-off, stainless steel filter, vent 

screw. Brass CW617N body. High impact plastic cap. 

Pressure gauge connection 1/4" F. Max. upstream pressure: 10 bar. 

Adjustable downstream pressure: 0.3 to 4 bar. 

31 


AL 0240100 1/2" MF 30 

ALM 

Like AL but with pressure gauge MR-RADIAL (50 mm dial, bottom entry, 0 - 4 bar). 


ALM 0240200 1/2" MF 30 

3110C 

FILLMATIC 

Automatic filling valve complete with 0-6 bar pressure gauge 3112C, self-cleaning check 

valve, manual shut-off, sintered bronze filter. Brass CW617N body. 

Max. upstream pressure: 10 bar. Adjustable downstream pressure: 0.3 to 4 bar. 

Set pressure: 1 bar. Setting ratio: 1 rev. = 0.4 m w.g. 


3110C 3110C12 1/2" MF 1 

CA9C FILLING KIT 

Combined filling and backflow preventer unit for boilers up to 45kW. 

Backflow preventer CA9C. Fillmatic filling valve. Two ball valves and Y type strainer. 

Connections 1/2” BSP Female. 


CA9C3110C M11801 1/2” 1 

Filling valves 

Pressure setting 

The filling valve is factory set at a pressure of 1 bar. 

To adjust for pressures other than the factory setting, merely turn the 

screw clockwise to increase the pressure (max. 4 bar) or anti-clockwise to 

decrease it (min. 0.3 bar). 

0.3 

1 

2 

3 

4 

5 

6 

3.5 

3 

2 

1 

0.3 

1 

2 

3 

3.5 

4 

5 

6 

3.5 

3 

2 

1 

0.3 

Installation 

Install the valve according to the direction of the arrow stamped on the 

valve body. For quicker filling, make sure the regulating valve is fully open, 

even if it is advisable to introduce the water at a sufficiently low speed in 

order to avoid formation of water pockets which are difficult to expel. When 

filling, the device ensures that all water supplied from the mains is filtered. 

10 m H 2 O 

10 ÷ 35 m H 2 O

AIR VENTS 

AIR VENTS WITH FLOAT 

32 

MVDR 

DUOVENT (PATENTED) 

Automatic and manual air vent valve with unscrewable cover for inspection complete with 

automatic shut-off valve RIA. Body and cover of brass CW617N. Corrosion-resistant 

polyethylene float. Nominal pressure: 12 bar. Max. operating pressure: 8 bar. 

Max. temperature: 115°C. Automatic venting capacity at 3 bar: 17.9 litres/min. 

Manual venting capacity at 3 bar: 139.5 litres/min. Also suitable for water containing 

additive (glycol up to 30%). 


MVDR 0250708 1/4" 120 

MVDR 0250710 3/8" 120 

MVDR 0250715 1/2" 120 

Advantage of built-in manual discharge 

The ever increasing use of horizontal or single-pipe distribution 

systems has led to the engineering of networks with small diameter 

piping, without slopes and with closed circuits, thus requiring the 

development of a special product line for venting air from the 

circuits. Compared to the conventional automatic operation with 

float determined by the water level in the heating system, the 

DUOVENT air vent valve offers the advantage of manual discharge 

which allows checking for correct operation and cleaning of the 

automatic discharge orifice as well as reducing emptying times. 

For manual discharge, unscrew the red cap and push the disc down 

with a screwdriver. When held down, it allows the water to flow 

through the orifice. 

The presence of the shut-off valve allows maintenance operations 

without emptying the system. 

MANUAL 

DISCHARGE 

AUTOMATIC 

DISCHARGE 

Automatic and manual vent at the 

various pressures 

SHUT-OFF VALVE

AIR VENTS 


MVR 

MINIVENT 

Automatic air vent valve complete with automatic sealed shut-off valve RIA with 

unscrewable cover for inspection. Body and cover of brass CW617N. Corrosion-resistant 

polyethylene float. Max. pressure: 12 bar. Max. temperature: 115°C. Also suitable for water 

containing additive (glycol up to 30%). 

33 


MVR 0250108 1/4" 10 

MVR 0250110 3/8" 10 

MVR 0250115 1/2" 10 

MKVR 

MICROVENT 

Automatic vertical air vent valve complete with automatic sealed shut-off valve RIA. Body 

and cover of brass CW617N. Sealed with O-Ring. Max. pressure: 10 bar. Max. temperature: 

110°C. Also suitable for water containing additive (glycol up to 30%). 


MKVR 0251310 3/8" 10 

MKLR 

MICROVENT 

Automatic side air vent valve complete with automatic sealed shut-off valve RIA. Body and 

cover of brass CW617N. Sealed with O-Ring. Max. pressure: 10 bar. Max. temperature: 

110°C. Also suitable for water containing additive (glycol up to 30%). 


MKLR 0252310 3/8" 10 

MKL 0252410 1/2” 10 

INTR 

INTERVENT 

Automatic vertical air vent valve complete with automatic shut-off valve RIA. 

Body and cover of brass CW617N. 

Max. pressure: 10 bar. Max. temperature: 115°C. 


INT 0252110 3/8" 10 

INT 0252115 1/2" 10

AIR VENTS 


34 

NEW 

FOR SOLAR SYSTEMS 

MV-SOL 

MINIVENT 

Automatic air vent valve for solar systems with unscrewable cover for inspection. Body 

and cover of brass CW617N, 1265-99. Polyethylene float. Seal between reservoir and 

cover with O-ring. Connection ND 3/8” - 1/2” DIN - ISO 228/1. Stainless steel (AISI 304) 

vacuum breaker (only for ND 3/8”). Max. operating pressure: 12 bar. Max. operating 

temperature: 160°C. 


MV-SOL 0249110 3/8" 10 

MV-SOL 0249115 1/2" 10 

2161C 

FLOATVENT 

Automatic vertical air vent valve. Sealed with O-ring. Designed for installation on head 

connections of flush manifolds. Brass CW617N body. Max. pressure: 10 bar. Max. 

temperature: 110°C. 


2161C 2161C38 3/8" 50 

2161C 2161C12 1/2" 50 

2161C 2161C34 3/4" 50 

2161C 2161C1 1" 50 

2311C 

CHECKVENT 

Sealed check valve for automatic vertical air vent valve 2161C38. 


2311C 2311C38 3/8" 50 

RIA 

Automatic shut-off valve for automatic air vent valves series MVD, MV, MKV, MKL. 

Complete with device for quick and total drainage of water from the valve. 


RIA 0259008 1/4" 10 

RIA 0259010 3/8" 10 

RIA 0259015 1/2" 10 

MOV173 

SUPERVENT 

Automatic high capacity commercial air vent with screwable cover for inspection. 

Incorporates an automatic check valve to isolate water for maintenance. Body and 

cover of brass. Max. pressure: 10 bar. Max temperature: 115°C. 


MOV173 M16300 3/8" 1

AIR VENTS 

MANUAL AIR VENT VALVES 

VMM 

Manual air vent valve for radiators, with adjustable discharge nozzle. Manual discharge 

opening through screwdriver or coin. Chrome-plated brass body CW617N. Glass fibre 

reinforced nylon handwheel and discharge nozzle body. Sealed on radiator through 

O-ring. Max. operating pressure: 10 bar. 

35 


VMM 0256206 1/8" 100 

VMM 0256208 1/4" 100 

VMM 0256210 3/8" 100 

PMC 

Manual air vent valve for radiators, with adjustable discharge nozzle. Manual vent opening 

through screwdriver, coin. Chrome-plated brass body CW617N. Glass fibre reinforced nylon 

discharge nozzle. Sealed on radiator through O-ring. Max. pressure: 10 bar. 


PMC 0256306 1/8" 100 

PMC 0256308 1/4" 100 

PMC 0256310 3/8" 100 

PMC 0256315 1/2" 100 

RSR 

Drain valve for radiators. Chrome-plated brass body. Adjustable plastic discharge nozzle. 

Sealed on radiator through O-ring. 


RSR 0256008 1/4" 100 

RSR 0256010 3/8" 100 

RSR 0256015 1/2" 100 

SMM 

Manual air vent valve for radiators, with adjustable discharge nozzle. Knurled handwheel. 

Chrome-plated brass CW617N body and discharge nozzle. Sealed on radiator through O- 

ring. Max. pressure: 10 bar. 


SMM 0257106 1/8" 100 

SMM 0257108 1/4" 100 

SMM 0257110 3/8" 100 

SMM 0257115 1/2" 100 

Manual air vent valve 

VMM Handwheel designed PMC CH 

for manual opening 

Inlet hole smaller than 

with screwdriver Valve handwheel PMC 

the outlet hole to avoid 

or coin. Limit stop on with opening by 

infiltration of particles 

the screw to avoid screwdriver or coin. 

which could block air 

the handwheel 

discharge. 

coming out from the 

valve body. 

O-ring for easy 

assembly and 

perfectly tight seal 

on the radiator. 

Adjustable discharge 

nozzle, glass fibre 

reinforced nylon 

body. 

Insert for adjusting 

discharge nozzle body. 

Wrench CH can be left 

inserted on the body. 

Insert for opening 

valves PMC, RSR 

Insert for opening 

valve VMM


THERMOMETERS, PRESSURE GAUGES, METERING PIPES AND ACCESSORIES 

36 

MA-AXIAL 

Pressure gauge complete with reference needle. Dial diameter: 50 mm. 

1/4" M axial connection. 

According to ISPESL. 

Type Part number Scale Box Qty 

MA50/4 0310104 0-4 bar 10 

MA50/6 0310106 0-6 bar 10 

MA50/10 0310110 0-10 bar 10 

MA50/16 0310116 0-16 bar 10 

MR-RADIAL 


1/4" M radial connection. 



MR50/4 0312104 0-4 bar 10 

MR50/6 0312106 0-6 bar 10 

MR50/10 0312110 0-10 bar 10 

MR50/16 0312116 0-16 bar 10 

TMAX 

Thermometer/pressure gauge with ABS case, complete with sheath and shut-off valve. 

Dial diameter: 80 mm. 1/2" M axial connection. Temperature scale: 0° - 120°C. 



TMAX/2 0332002 0-2,5 bar 10 

TMAX/4 0332004 0-4 bar 10 

TMAX/6 0332006 0-6 bar 10 

TMRA 

Thermometer/pressure gauge with ABS case, complete with sheath and shut-off valve. 

Dial diameter: 80 mm. 1/2" M radial connection. Temperature scale: 0° - 120°C. 



TMRA/2 0333002 0-2,5 bar 10 

TMRA/4 0333004 0-4 bar 10 

TMRA/6 0333006 0-6 bar 10


THERMOMETERS, PRESSURE GAUGES , METERING PIPES AND ACCESSORIES 

MA60-AXIAL 


1/4"M axial connection. 


37 


MA60-AXIAL 0316204 0-4 bar 10 

MA60-AXIAL 0316206 0-6 bar 10 

MA60-AXIAL 0316210 0-10 bar 10 

MA60-AXIAL 0316216 0-16 bar 10 

MA60-RADIAL 


1/4" male radial connection. 



MA60-AXIAL 0318204 0-4 bar 10 

MA60-AXIAL 0318206 0-6 bar 10 

MA60-AXIAL 0318210 0-10 bar 10 

MA60-AXIAL 0318216 0-16 bar 10 

TB 

Contact thermometer with bimetallic helix element. Complete with steel sheet spring for 

holding on pipe. Black painted steel case. Chrome-plated rim. Scale divisions 1°C. 

Type Part number Scale Face Box Qty 

TB 0308060 0-120 °C 63 mm 10 

3112C 

Spare pressure gauge, 0 to 6 bar, for FILLMATIC. 

Type Part number Scale Size body Box Qty 

3112C 3112C 0-6 bar 1/4" 1

Expansion 

vessels

EXPANSION VESSELS 

EXPANSION VESSELS FOR HEATING SYSTEMS 

40 

SELECTION CHART 

Elements necessary for the calculation of the proper heating systems: 

• expansion coefficient of water 0,029 

• initial pressure = static height of the plant 

• final pressure: 3 bar 

Selection can also be based on the system heating capacity (calculation based on 12 litres of water per 1 kW). 

Tanks Volume Precharge Max. plant Average time 80 °C (90-10) Dimensions Connector 

capacity utilised pressure Height Water Maximum power boiler Ø H 

litres litres bar m instal. Ltr KW Kcal/h 

5 3.1 0.5 5 107 8908 7660 160 320 ¾” 

2.5 1 10 86 7183 6177 

1.9 1.5 15 65 5400 4640 

8 5 0.5 5 172 14330 12320 200 330 ¾” 

4 1 10 138 11500 9890 

3 1.5 15 103 8580 7380 

12 7.5 0.5 5 259 21580 18560 270 300 ¾” 

6 1 10 207 17250 14840 

4.5 1.5 15 155 12910 11100 

18 11.3 0.5 5 380 32500 27950 270 420 ¾” 

9 1 10 310 25830 22210 

6.7 1.5 15 231 19250 16580 

25 15.6 0.5 5 538 44830 38550 290 450 ¾” 

12.5 1 10 431 35920 30890 

9.4 1.5 15 324 27000 23220 

40 25 0.5 5 862 71800 61750 320 560 ¾” 

20 1 10 690 57500 49500 

15 1.5 15 517 43000 37000 

35 22 0.5 5 754 62859 54059 380 380 ¾” 

18 1 10 603 50287 43247 

13 1.5 15 453 37716 32435 

50 31 0.5 5 1078 89799 77227 380 380 ¾” 

25 1 10 862 71839 61782 

19 1.5 15 647 53879 46336 

80 50 0.5 5 1724 143678 123563 450 450 ¾” 

40 1 10 1379 114943 98851 

30 1.5 15 1034 86207 74138 

100 63 0.5 5 2155 179598 154454 450 450 ¾” 

50 1 10 1724 143678 123563 

38 1.5 15 1293 107759 92672 

60 37.5 0.5 5 1293 107758 92670 380 690 ¾” 

30 1 10 1034 86206 74135 

22.5 1.5 15 775 64655 55600 

80 50 0.5 5 1724 143700 123600 450 680 ¾” 

40 1 10 1379 115000 98900 

30 1.5 15 1034 86100 74000 

20 2 20 690 57500 49500 

100 62.5 0.5 5 2155 179600 154500 450 760 1” 

50 1 10 1724 143700 123600 

37.5 1.5 15 1293 107700 92600 

25 2 20 862 71800 61750 

150 93.8 0.5 5 3234 269500 231770 550 785 1½” 

79 1 10 2500 215500 185330 

56.3 1.5 15 1941 161750 139110 

37.5 2 20 1293 107750 92670 

200 125 0.5 5 4310 358170 308886 550 1010 1½” 

100 1 10 3448 287330 247100 

75 1.5 15 2586 215500 185230 

50 2 20 1724 143570 123560 

250 156 0.5 5 5379 448000 358000 630 1000 1½” 

125 1 10 4310 359000 308000 

94 1.5 15 3241 270000 232000 

63 2 20 2172 181000 135000 

300 187.5 0.5 5 6468 538830 463400 630 1180 1½” 

150 1 10 5172 431000 370600 

112.5 1.5 15 3879 323250 278000 

75 2 20 2586 216500 186330 

500 312.5 0.5 5 10776 898000 773000 780 1260 1½” 

250 1 10 8621 718000 617000 

187.5 1.5 15 6466 539000 463000 

125 2 20 4310 359000 309000 

62.5 2.5 25 2155 180000 155000 

700 437.5 0.5 5 15086 1260000 1084000 780 1620 1½” 

350 1 10 12069 1005000 864000 

262.5 1.5 15 9052 754000 648000 

175 2 20 6034 503000 432000 

87.5 2.5 25 3017 251000 216000



EXTRAVAREM LR 

Expansion vessel with fixed membrane for central heating and boiler systems. 

Carbon steel body with red epoxy polyester paint finish, carbon steel flange. 

Max. system temperature – 99ºC. 

Max. pressure of vessel – 5 bar. 

Connection – ¾” 

Precharged to 1.5 bar. 

41 

Part Number Capacity litre Height mm Diameter mm 

VEX5 5 320 160 

VEX8 8 330 200 

VEX12 12 315 270 

VEX18 18 420 270 

VEX25 25 450 290 

VEX40 40 582 320 

STARVAREM LR 

Expansion vessel with feet and diaphragm membrane for central heating and boiler systems. 







VST35F 35 392 380 

VST50F 50 485 380 

VST80F 80 692 450 

VST100F 100 763 450 

MAXIVAREM LR 

Expansion vessel with replaceable membrane for central heating and boiler systems. 




Connection – 60-100 Ltr 1” Larger Sizes 1½” 



VMA60 60 550 380 

VMA80 80 735 450 

VMA100 100 790 450 

VMA150 150 800 550 

VMA200 200 1080 550 

VMA250 250 984 630 

VMA300 300 1177 630 

VMA400 400 1540 630 

VMA500 500 1283 780 

VMA600 600 1340 780 

VMA700 700 1685 780



42 

EXTRAVAREM LC WITH STAINLESS STEEL FLANGE 

Expansion vessel with fixed membrane for domestic hot water systems. 

Carbon steel body with white epoxy polyester paint finish, stainless steel flange. 


Max. pressure of vessel – 2 litre 10 bar all others 8 bar. 

Connection – 2 litre – ½” all other sizes ¾” 



VEXP016 0.16 105 65 

VEXP2 2 240 125 

VEXP5 5 300 160 

VEXP8 8 330 200 

VEXP12 12 315 270 

VEXP18 18 420 270 

VEXP24 24 335 360 

VEXP25 25 450 290 

INTERVAREM – POTABLE 

Expansion vessel with replaceable membrane for potable water. 

Carbon steel body with blue epoxy polyester paint finish, carbon steel flange. 



Connection – 1” 



VINP5 5 320 160 

VINP8 8 330 200 

VINP12 12 315 270 

VINP19 19 420 270 

VINP24 24 335 360 

VINP40 40 582 320 

INTERVAREM – POTABLE WITH STAINLESS STEEL FLANGE 

Expansion vessel with replaceable membrane for potable water. 

Carbon steel body with blue epoxy polyester paint finish, stainless steel flange. 






VINP5SS 5 329 163 

VINP8SS 8 330 200 

VINP12SS 12 315 270 

VINP19SS 19 420 270 

VINP20HSS 20 492 290 

VINP24VSS 24 335 360 

VINP40SS 40 582 320 

VINP50SS 50 604 379



MAXIVAREM LS HORIZONTAL – POTABLE 

Horizontal expansion vessel with replaceable membrane for potable water 

Carbon steel body with blue epoxy polyester paint finish, carbon steel flange. 





43 


VMAP40H 40 580 345 

VMAP50H 50 615 430 

VMAP60H 60 680 382 

VMAP80H 80 680 450 

VMAP100H 100 780 450 

VMAP200H 200 1030 550 

VMAP300H 300 1185 630 

MAXIVAREM LS HORIZONTAL – POTABLE WITH STAINLESS STEEL FLANGE 

Horizontal expansion vessel with replaceable membrane for potable water 







VMAP40HSS 40 580 345 

VMAP50HSS 50 615 430 

VMAP60HSS 60 680 382 

VMAP80HSS 80 680 450 

VMAP100HSS 100 780 450 

VMAP200HSS 200 1030 550 

VMAP300HSS 300 1185 630 

MAXIVAREM LC VERTICAL – POTABLE 

Vertical expansion vessel with replaceable membrane for potable water 




Connection – 60-100 Ltr 1” Up to 400 Ltr 1½” 



VMAP60 60 550 380 

VMAP80 80 735 450 

VMAP100 100 790 451 

VMAP150 150 800 550 

VMAP200 200 1080 550 

VMAP250 250 984 630 

VMAP300 300 1177 630 

VMAP400 400 1540 630



44 

MAXIVAREM LS VERTICAL – POTABLE WITH STAINLESS STEEL FLANGE 

Vertical expansion vessel with replaceable membrane for potable water 




Connection – 60-100 Ltr 1” up to 750 Ltr 1½” 1000 Ltr – 2” 



VMAP50VSS 50 770 382 

VMAP60VSS 60 845 382 

VMAP80VSS 80 851 450 

VMAP100VSS 100 950 450 

VMAP200VSS 200 1255 550 

VMAP300VSS 300 1405 630 

VMAP500VSS 500 1550 780 

VMAP750VSS 750 1940 780 

VMAP1000VSS 1000 2200 980 

SOLARVAREM LR – SOLAR WITH STAINLESS STEEL FLANGE 

Expansion vessel with replaceable membrane for solar energy systems. 

Carbon steel body with red epoxy polyester paint finish, stainless steel flange. 


Max. pressure of vessel – up to 40 litre – 8 bar larger sizes 6 bar. 

Connection – 5 - 80 Ltr ¾” 100 Ltr 1” 200 & 300 Ltr 1½” 



VSOL5W 5 315 160 

VSOL8W 8 330 200 

VSOL12W 12 300 270 

VSOL19W 19 405 270 

VSOL25W 25 450 290 

VSOL40W 40 560 320 

VSOL60 60 730 380 

VSOL80 80 735 450 

VSOL100 100 790 450 

VSOL200 200 1080 550 

VSOL300 300 1177 630 

FLATVAREM – FOR HEATING SYSTEMS – AVAILABLE ON REQUEST



SEALED SYSTEM KIT 

For installation in central heating and boiler systems. 

Each kit includes a heating vessel, pressure relief valve with gauge, manifold, mounting 

bracket (options below available) and combined filling loop, isolator and double check valve. 

45 

Part Number Capacity litre Description Box Qty 

SSC5 5 Sealed system filing kit 1 





MOUNTING KIT 

Includes bracket, nuts and screws. 

Part Number Description Box Qty 

BRKT1 Mounting kit for vessels 4 to 25 litre 1 

BRKT2 Mounting kit for o vessels 35 & 50 litre 1 

MOUNTING KIT 

Wrap round bracket comprising strap, wall bracket and fixing screws. 


ER24KIT Mounting kit for vessels 1 

V5O920 Mounting kit for vessels 1 

MANIFOLD CROSS 

Plain brass manifold cross with 15mm compression inlet, 3/4” BSP Female vessel connection, 

1/2” BSP male relief valve connection, plain end for connection to double check valve with 

15mm compression ends. 


CORE641002 Four way manifold cross 1 

SPARE BLADDERS – AVAILABLE ON REQUEST

Balancing valves

WATTFLOW BP BALANCING VALVES 

48 

APPLICATIONS OF WATTFLOW BP 

Regulation of heating, ventilation and air-conditioning systems. Balancing of drinking water 

circulation pipes as well as solar and heat pump systems. Excess or insufficient feed to consumer 

circuits in HVAC systems is the main cause of malfunctions. WattFlow balancing valves take care 

of hydraulic balancing; they are also easy to operate and require no special training. WattFlow 

balancing valves can therefore be used to regulate HVAC systems quickly and with maximum 

precision without the need for expensive measuring computers or special tools. 

The VOB/C – DIN 18380 standard requires the hydraulic balancing of pipelines, as does DIN 

EN 12828. The pipe systems must be designed in such a way that heating water is fed to all 

parts of the heating system with the necessary heating energy. The following factors (among 

others) must be taken into account: temperature, operating pressure, pressure loss and noise 

levels (due to flow speed, for example). Hydraulically correctly balanced systems can be 

regulated with greater precision and therefore save both energy and money. 

DESIGN/MODE OF OPERATION 

All WattFlow BP balancing valves are equipped as standard with an integrated flowmeter 

which continuously measures the current flow volume and indicates it on a scale protruding 

from the side of the housing. The scale is graduated in l/min and can be rotated about its own 

axis, thereby allowing optimum positioning for convenient and accurate read-off of values. The 

display is located away from the flow measurement zone to protect it against dirt and debris. 

In other words, the medium does not flow directly past the sight glass. The inclined 

seat valve with regulating cone (also integrated) regulates the flow volume. The selected 

valve characteristic ensures that the valve stroke is spread across several rotations of the 

spindle. This guarantees maximum setting accuracy. The flow-friendly valve design ensures 

minimum noise emissions. The WattFlow balancing valves are not affected by the flow profile 

at the inlet, and a straight inlet route of the same length as the housing is therefore generally 

adequate. The valves can be mounted in any desired orientation, and the correct direction of 

flow is indicated by an arrow on the housing. 

TENDER TEXT FOR WATTFLOW BP 

Balancing valve for rapid and exact balancing of consumer circuits in HVAC systems and drinking water circulation pipelines. 

Integrated flow display with rotatable indicator scale marked in l/min. Actual flow volume can be read off directly without the 

need for measuring computers or charts. The sight glass of the flow indicator is not installed directly in the medium flow and 

is therefore protected against soiling. Measuring accuracy ± 10% of measuring value. The flow volume is adjusted via 

several spindle rotations of an angle seat valve. Installation orientation as desired in the flow or return lines. Nominal width 

DN ..., housing made of brass. Sight glass made of impact- and temperature-resistant plastic. Spring made of stainless 

steel. Gaskets made of EPDM. Max. operating temperature TB 100° C at max. operating pressure PB 10 bar. 

Article-no. Type Dimension Connection Flow rate Kvs MemoStop 

3498300 SRV15-AG DN 15 1“ AG 0,5 – 7 l/min 1,5 without 

3498305 SRV15-AG DN 15 1“ AG 2 – 16 l/min 3,0 without 

3498310 SRV20-AG DN 20 1“ AG 4 – 36 l/min 3,5 without 

3498315 SRV15-KVSR DN 15 KVSR 15 mm 0,5 – 7 l/min 1,5 without 

3498320 SRV15-KVSR DN 15 KVSR 15 mm 2 – 16 l/min 3,0 without 


3498330 SRV15-KVSR DN 15 KVSR 22 mm 0,5 – 7 l/min 1,5 without 



3498285 SRV15-KVSR DN 15 KVSR 15/22 mm 0,5 – 7 l/min 1,5 without 

3498290 SRV15-KVSR DN 15 KVSR 15/22 mm 2 – 16 l/min 3,0 without 

3498295 SRV15-KVSR DN 20 KVSR 15/22 mm 4 – 36 l/min 3,5 without 

3498355 SRV25-IG DN 25 1“ IG 5 – 50 l/min 5,5 with 

3498360 SRV32-IG DN 32 1 ¼“ IG 10 – 80 l/min 9,0 with 

3498365 SRV40-IG DN 40 1 ½“ IG 15 – 120 l/min 13,0 with 

3498370 SRV50-IG DN 50 2“ IG 20 – 200 l/min 18,0 with 

3498345 SRV25-AG DN 25 1 ¼“ AG 5 – 50 l/min 5,5 with 

3498350 SRV32-AG DN 32 1 ½“ AG 10 – 80 l/min 9,0 with 

on request SRV40-AG DN 40 2“ AG 15 – 120 l/min 13,0 with 

on request SRV50-AG DN 50 2 ¼“ AG 20 – 200 l/min 18,0 with

WATTFLOW OL BALANCING VALVES 

APPLICATIONS OF WATTFLOW OL 

Regulation of consumer circuits in heating, ventilation and air-conditioning systems. Balancing of 

drinking water circulation pipes. Excess or insufficient feed to consumer circuits in HVAC systems 

is not seldom the cause of malfunctions. WattFlow OL balancing valves were developed to 

provide planners and operators with an extremely simple, cost-efficient and effective means of 

regulating consumer circuits in heating and cooling systems. WattFlow OL balancing valves can 

be used to regulate HVAC systems rapidly and with maximum precision without the need for 

training of personnel. 

49 

Hydraulically correctly balanced systems can be regulated with greater precision and therefore 

save both energy and money. 

DESIGN/MODE OF OPERATION 

All WattFlow OL balancing valves are equipped with an integrated flowmeter which continuously 

displays the current flow volume in litres/min. The advantages of the flow indicator mounted 

outside the housing axis are as follows: 

• As the flow indicator is not positioned directly in the medium flow, the display is protected 

against dirt and stays clearly visible for long periods. 

• The scale element graduated in litres/min can be rotated about its own axis, thereby allowing 

convenient read-off of the indicated volume flow in any mounting orientation. 

• WattFlow OL balancing valves and their flow indicators do not require any special inlet route. 

The length of the straight pipe may also be lower than the recommended straight pipe length 

(equal to the housing length). 

• The valves can be mounted in any desired orientation; the correct direction of flow is 

indicated by an arrow on the housing. 

TENDER TEXT FOR WATTFLOW OL 

WattFlow OL balancing valve with inclined seat valve for rapid and exact hydraulic balancing of consumer circuits in HVAC 

systems. Balancing valve with integrated flow indicator which is not installed directly in the medium flow and is therefore 

protected against soiling. Flow indicator with rotatable indicator scale. Nominal width DN ..., max. operating temperature 

100°C at an operating pressure of 6 bar or 70°C at 10 bar. Housing made of brass. Flow indicator made of impact- and heatresistant 

plastic. Spring made of stainless steel. Gaskets made of EPDM. 

Article no. Type Dimension Connection Flow rate Kvs 

3498000 SRVOL15-AG DN 15 ¾“ AG* 1 – 8 l/min 1,7 

On request SRVOL15-IGAG DN 15 ½“ IG x ¾“ AG* 1 – 8 l/min 1,7 

3498010 SRVOL15-IG DN 15 ½“ IG 1 – 8 l/min 1,7 

3498011 SRVOL20-KVSR DN 20 15 mm 1 – 8 l/min 1,7 


3498013 SRVOL20-KVSR DN 20 15/22 mm 1 – 8 l/min 1,7 

3498015 SRVOL20-AG DN 20 1“ AG 2 – 16 l/min 2,0 

3498020 SRVOL20-IG DN 20 ¾“ IG 2 – 16 l/min 2,0 



3498035 SRVOL20-KVSR DN 20 15/22 mm 2 – 16 l/min 2,0 

*eurocone, AG = male thread, IG = female thread, KVSR = compression fitting

WATTFLOW BP BALANCING VALVES 

50 

DIMENSIONS 

B 

Z 

operating pressure PB [bar] 

12 

10 

8 

The parameters pressure and and 

6 temperature 

temperature 

must 

must 

be 

be 

within 

within 

the 

the limits shown. Long-therm 

limits shown. Longterm operation at 

4 operation at temperatures above 

temperatures 

100° C/212° F 

above 

(shaded 

100°C/212°F 

area) is to 

2 (shaded be avoided. area) is to be avoided. 

0 

20 40 60 80 100 

operating temperature TB [°C] 

120 

140 

1.000 

A BC D E F G 

Flowindication 10 Liter/min 

(Example) 

B 

Y 

X 

Z 

pressure drop [mbar] 

100 

10 

1 

10 

100 

flow rate [L/min] 

Pressure drop curve Flow rate Kvs 

A 0,5 – 7 L/MIN 1,3 

B 2 – 16 L/MIN 3,0 

C 4 – 36 L/MIN 3,5 

D 5 – 50 L/MIN 5,5 

E 10 – 80 L/MIN 9,0 

F 15 – 120 L/MIN 13,0 

G 20 – 200 L/MIN 18,0 

1.000 

Article no. Type Dimension A B L L1 H H1 X Y Z 

3498300 SRV15-AG DN 15 1“ AG =A 86 --- 68 37 --- --- SW 4 

3498305 SRV15-AG DN 15 1“ AG =A 86 --- 68 37 --- --- SW 4 

3498310 SRV20-AG DN 20 1“ AG =A 86 --- 68 37 --- --- SW 4 

3498315 SRV15-KVSR DN 15 15/22 mm =A 86 106 68 37 SW 32 --- SW 4 



3498330 SRV15-KVSR DN 15 22 mm =A 86 106 68 37 SW 32 --- SW 4 






3498355 SRV25-IG DN 25 1“ IG =A 120 --- 73 69 --- SW 43 SW 6 

3498360 SRV32-IG DN 32 1¼“ IG =A 135 --- 77 77 --- SW 49 SW 6 

3498365 SRV40-IG DN 40 1½“ IG =A 153 --- 80 78 --- SW 61 SW 6 

3498370 SRV50-IG DN 50 2“ IG =A 176 --- 85 87 --- SW 70 SW 6 

3498345 SRV25-AG DN 25 1¼“ AG =A 120 --- 73 69 --- --- SW 6 

3498350 SRV32-AG DN 32 1½“ AG =A 135 --- 77 77 --- --- SW 6 

On request SRV40-AG DN40 2“ AG =A 153 --- 80 78 --- --- SW 6 

On request SRV50-AG DN 50 2¼“ AG =A 176 --- 85 87 --- --- SW 6 

AG = male thread, IG = female thread, KVSR = compression fitting 

Technical Specifications 

Max. operating temperature 100°C 1) 

Min. operating temperature -20°C 2) 

Max. operating pressure 10 bar 1) 

Accuracy of flowmeter 

±10% of measuring value 

1) Pay attention to the pressure/temperature diagram 

2) When using appropriate antifreezing compounds 

Material Specifications 

Housing 

Flowmeter 

Spring 

Gaskets 

Brass 

Impact- and temperature 

resistant plastic 

Stainless steel 

EPDM

X 

WATTFLOW OL BALANCING VALVES 

DIMENSIONS 

operating pressure PB [bar] 

12 

10 

8 

6 

4 

2 

0 

20 

Pressure/temperature diagram 

40 60 80 100 

120 

51 

1.000 

Pressure drop diagram 

A B 

Y 

Flow indication 

pressure drop [mbar] 

100 

2 Litre/min 

10 

1 

10 

flow rate [l/min] 

100 

Pressure drop curve Flow rate Kvs 

A 1 – 8 L/MIN 1,7 

B 2 – 16 L/MIN 2,0 

Article no. Type Dimension A B L L1 L2 H H1 X Y 

3498000 SRVOL15-AG DN 15 ¾“ AG* = A 81 --- 17 67 23 --- --- 

On request SRVOL15-IGAG DN 15 ½“ IG ¾“ AG** 81 --- 17 67 23 --- SW 27 

3498010 SRVOL15-IG DN 15 ½“ IG = A 81 --- 17 67 23 --- SW 27 

3498011 SRVOL20-KVSR DN 20 15 mm = A 86 106 7 71 27 SW 32 --- 


3498013 SRVOL20-KVSR DN 20 15/22 mm = A 86 106 7 71 27 SW 32 --- 

3498015 SRVOL20-AG DN 20 1“ AG = A 86 --- 15 71 27 --- --- 

3498020 SRVOL20-IG DN 20 ¾“ IG = A 86 --- 15 71 27 --- SW 34 



3498035 SRVOL20-KVSR DN 20 15/22 mm = A 86 106 5 71 27 SW 32 --- 

*eurocone, AG = male thread, IG = female thread, KVSR = compression fitting 

Technical Specifications 

Max. operating temperature 100°C 1) 

Min. operating temperature -10°C 2) 

Max. operating pressure 6 bar 1) 

Accuracy of fl owmeter ±10% of measuring value 3) 

1) Pay attention to the pressure/temperature diagram 

2) When using appropriate antifreezing compounds 

3) Valid for Water-Glycol above 20°C 

Material Specifications 

Housing 

Flowmeter 

Spring 

Gaskets 

Brass 

Impact- and temperatureresistant 

plastic 

Stainless steel 

EPDM 

Subject to technical modifications

Microflex

MICROFLEX 

54 

THE UNIQUE ASSETS OF MICROFLEX: 

FLEXIBILITY, DURABILITY AND EXPERTISE 

FLEXIBILITY 

• VERY EXTENSIVE RANGE OF PIPES AND 

ACCESSORIES – COMPLETE SYSTEM 

• AVAILABLE TO ORDER OR ON FULL COILS UP TO 100 M 

FOR LARGE NETWORKS – NO PIPE WASTAGE 

• FAST INSTALLATION EVEN IN THE EVENT OF BENDS, 

OBSTACLES, WALL FEED-THROUGHS AND BRANCHES 

• NO COMPENSATORS NEEDED THANKS TO THE PIPING 

SYSTEM’S SELF-COMPENSATORY BEHAVIOUR 

• NO SKILLED WELDERS NEEDED FOR CONNECTIONS 

• NO SPECIAL TOOLS NEEDED 

• LIMITED WEIGHT FACILITATES EASY INSTALLATION 

• SIMPLE AND SAFE TO OPERATE MODULAR SYSTEM 

OF CONNECTIONS, INCLUDING COUPLINGS AND 

ACCESSORIES 

• FAST INSTALLATION AND ACCELERATED ASSEMBLY 

CUT INSTALLATION COSTS SIGNIFICANTLY 

DURABILITY 

• HIGH-GRADE RAW MATERIALS ENSURE A VERY LONG 

PRODUCT LIFE 

• UNIQUE DOUBLE WALL OUTSIDE CASING IN HDPE 

PROVIDES EXTRA PROTECTION TO THE TUBE 

• SOPHISTICATED GEOMETRY OF OUTSIDE CASING 

ENSURES UNPARALLELED FLEXIBILITY AND HIGH 

RESISTANCE TO IMPACTS AND PRESSURE 

• VERY ELASTIC THERMAL FOAM INSULATION IN PE-X 

WITH CLOSED CELL STRUCTURE – EXCELLENT LONG- 

TERM INSULATION QUALITIES AND HIGH Μ FACTOR 

• INSULATING CENTREPIECE GUARANTEES AN 

EFFECTIVE SEPARATION OF INLET AND OUTLET PIPES 

• CORROSION-FREE TRANSPORT PIPE IN PE-XA (OR PE), 

UNIQUE CHEMICAL RESISTANCE, VERY LONG LIFE EVEN 

UNDER HIGH PRESSURES AND TEMPERATURES, 

MAXIMUM RESISTANCE TO CRACKS CAUSED BY AGEING 

• SYSTEM PIPES ARE HIGHLY RESISTANT TO EXTERNAL 

INFLUENCES, SUCH AS STRESS, MICRO ORGANISMS 

AND TEMPERATURE SWINGS

MICROFLEX 

PRODUCTS BY APPLICATION 

Application Fluid Pipe T° max fluid Pressure Microflex solutions 

Heating water PE-Xa 95°C 6 bar M…C MD…C MQ… 

55 

Hot (potable)water PE-Xa 95°C 10 bar M…S MD…S MQ… 

Cold (potable) water HDPE 25°C 16 bar M(V)…PE MD…PE 

Cooling water HDPE -10°C 16 bar M(V)…PE MD…PE 

YOUR GUARANTEE OF QUALITY

MICROFLEX 

CENTRAL HEATING 

56 

MICROFLEX ® UNO 

Single flexible, pre-insulated, self-compensating, underground pipe. Especially suitable for 

heating water, but also for (hot) potable water, wastewater and other fluids. 

Corrosion-resistant transport pipe in cross-linked PE-Xa in accordance with DIN 16892/16893, 

with yellow oxygen diffusion barrier in accordance with DIN 4726. Thermal, elastic, CFC-free 

foam insulation made from cross-linked PE-X with closed microcellular structure. Minimal 

water absorption capacity of

MICROFLEX 

CENTRAL HEATING 

MICROFLEX ® DUO 

Double flexible pre-insulated, self-compensating, underground pipe. Especially suitable for 

heating water, but also for (hot) potable water, wastewater and other fluids. Corrosion-resistant 

transport pipe in cross-linked PE-Xa in accordance with DIN 16892/16893, with yellow oxygen 

diffusion barrier in accordance with DIN 4726. Thermal, elastic, CFC-free foam insulation made 

from cross-linked PE-X with closed microcellular structure. Minimal water absorption capacity 

of

MICROFLEX 

SANITARY 

58 

MICROFLEX ® UNO 

Single flexible pre-insulated, self-compensating, underground pipe. Especially suitable for hot 

and cold potable water, but also for wastewater and other fluids. Corrosion-resistant transport 

pipe in cross-linked PE-Xa in accordance with DIN 16892/16893. Thermal, elastic, CFC-free 



MICROFLEX 

SANITARY 

MICROFLEX ® DUO 

Single flexible pre-insulated, self-compensating, underground pipe. Especially suitable for hot 

and cold potable water, but also for wastewater and other fluids. Corrosion-resistant transport 

pipe in cross-linked PE-Xa in accordance with DIN 16892/16893. Thermal, elastic, CFC-free 



MICROFLEX 

CENTRAL HEATING AND SANITARY 

60 

MICROFLEX ® QUADRO 

Flexible pre-insulated, self-compensating underground pipe comprising two heating pipes and 

two sanitary pipes. Designed for heating water (flow and return), and equipped with a sanitary 

hot water pipe and a pipe for the circulation loop. Corrosion-resistant transport pipe in crosslinked 

PE-Xa in accordance with DIN 16892/16893, with yellow oxygen diffusion barrier in 

accordance with DIN 4726 for the heating water pipes. Thermal, elastic, CFC-free foam 

insulation made from cross-linked PE-X with closed microcellular structure. Minimal water 

absorption capacity of

MICROFLEX 

UNDERGROUND INSULATION KITS 

INSULATED T-PIECE KIT 

Guarantees complete insulation and sealing of branch connections between Uno, Duo and 

Quadro pipes. Kit comprises 2 halves in HDPE, rock wool insulation, sealer kit, stainless steel 

bolts and assembly instructions. 

61 

Microflex pipe 

with casing 

d out 

L W H Weight 

Art. No. mm mm mm mm kg 

MT129075 125/90/75 960 590 200 5.5 

MT201612 200/160/125 1170 750 270 8.0 

Heat shrinkable caps to be ordered separately 

INSULATED ELBOW 90º PIECE KIT 

Guarantees complete insulation and sealing of perpendicular connections between Uno, Duo 

and Quadro pipes. Kit comprises 2 halves in HDPE, rock wool insulation, sealer kit, stainless 

steel bolts and assembly instructions. 


with casing 

d out 

L W H Weight 


MH201612 200/160/125 740 740 270 7.5 

Heat shrinkable caps to be ordered separately 

INSULATED I-PIECE KIT 

Guarantees complete insulation and sealing of straight extensions of Uno, Duo and Quadro 

pipes. Kit comprises 2 halves in HDPE, rock wool insulation, sealer kit, stainless steel bolts 

and assembly instructions. 


with casing 

d out 

L W H Weight 


MM129075 125/90/75 960 290 200 4.5 

MM201612 200/160/125 1170 345 270 5.5 

Heat shrinkable caps to be ordered separately

GENERAL ORDER INFORMATION 

62 

HOW TO ORDER 

By phone 

Monday to Friday 8.30am to 5.00pm on 

01386 446997. Please confirm all verbal orders 

in writing and annotate “CONFIRMATION ORDER”. 

By fax 

Anytime on 01386 41923. 

Please specify catalogue product number, 

quantity, description, delivery and invoice 

address/es, due date, order numbers 

and delivery method. For example: 

1. Normal three-day carrier. 

2. Overnight next day delivery at additional 

charge on application. 

3. Overnight am delivery at additional charge 

on application. 

By email 

Send to sales@wattsindustries.co.uk 

TECHNICAL INFORMATION 

For any further information on listed products, do 

not hesitate to contact us. We can supply 

technical data sheets where available or offer 

specialised advice for your particular application. 

CUSTOMER COLLECTION 

Should customers prefer, we can prepare goods 

for their own carrier collection. Customers are 

requested to make all goods collections between 

the hours of 9am 4pm, Monday to Friday inclusive. 

We are closed for lunch from 1pm - 2pm. 

NON-ACCOUNT CUSTOMERS 

Please call on 01386 446997 for details on your 

local distributor or opening an account. 

RETURN GOODS 

You should telephone our Sales Support 

Department within 48 hours of delivery, and 

please be prepared to advise the following: 

1. Your order number. 

2. Watts Industries UK despatch advice 

note number. 

3. Reason for return. 

A Goods Returns Note will be forwarded to you 

for return with the goods, please note that 

consignments sent without a Watts Industries 

Returns Note could be rejected. Goods will only 

be credited if received in good saleable condition 

including all packaging; also, we reserve the rights 

to make a 25% handling charge. Authorised 

returns must be sent freight prepaid. 

CONDITIONS OF SUPPLY 

Prices 

Prices shown are in pounds sterling and exclude 

VAT. Prices are subject to change without notice. 

Terms 

Terms and Conditions available upon request. 

Property of goods 

Until the payment has been received, all 

goods remain the property of Watts Industries 

UK Limited. 

Guarantee 

Watts Industries UK Limited will make good by 

repair or replacement any defect or failure arising 

from faulty material or workmanship for a period 

of 12 months from despatch date. Defective 

components must be returned to our works for 

inspection and are subject to the Return 

Procedure detailed prior. 

Minimum order value 

The minimum order value is £50.00. Orders for 

less than this value will be charged at the 

minimum order value. 

Delivery charge 

Delivery within the UK is at no charge on orders 

of over £300.00 (excluding VAT). 

The minimum delivery charge is £7.00 on orders 

under £300.00 (excluding VAT). 

Please call for delivery charge quotation on orders 

under £300.00 that involve large or heavy items. 

DISCOUNTS 

Subject to agreement. 

GENERAL 

Catalogue is for guidance only and liable to 

change. WRAS approvals indicated are accurate 

at the time of print and should always be 

confirmed with Watts Industries. E&OE.

Antipollution devices 

Pressure reducing valves 

Boiler components 

Expansion vessels 

Balancing valves 

Microflex 

7 

17 

25 

39 

47 

53

Reorder number: CAT TC01 

Watts Industries UK Ltd 

Grosvenor Business Park Evesham Worcestershire WR11 1GA, United Kingdom 

Phone +44 (0)1386 446997 – Fax +44 (0)1386 41923 

E-mail sales@wattsindustries.co.uk – Site www.wattsindustries.com

Watts Catalogue

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