Pressure reducing valves - Watts Industries

• Guide of applications
Pressure reducing valves

PRESSURE REDUCING vAlvES
CONTENTS
2
page
l The pressure reducing valve: Definition ___________________________________________________________________________________________________________________________3
l Water savings _____________________________________________________________________________________________________________________________________________________________________________________________3
l Pressure reducing valves or Regulators _______________________________________________________________________________________________________________________3
l WATTS, the inventor of the regulator __________________________________________________________________________________________________________________________________4
l How to choose the diameter of pressure reducing valves __________________________________________________________________________4
l Installation ____________________________________________________________________________________________________________________________________________________________________________________________________5
l How to adjust a pressure reducing valve ____________________________________________________________________________________________________________________5
l Precautions __________________________________________________________________________________________________________________________________________________________________________________________________5
l Pressure gauge: the essential accessory _______________________________________________________________________________________________________________________6
l European standard EN 1567 and the brand NF___________________________________________________________________________________________________________6
l Sanitary Conformity (ACS / WRAS) _________________________________________________________________________________________________________________________________________6
l Pressure reducing valve, the WATTS INDUSTRIES expertise_______________________________________________________________________6
l Case of electrical hot water storage heater_________________________________________________________________________________________________________________7
l Case of tower blocks______________________________________________________________________________________________________________________________________________________________________7-8
l Applications Guide ________________________________________________________________________________________________________________________________________________________________________________9
l Product information sheets_________________________________________________________________________________________________________________________________________10 to 20

PRESSURE REDUCING vAlvES
THE PRESSURE REDUCING vAlvE: DEFINITION
This valve reduces the pressure of the water that goes through it, and is used to obtain a regulated and constant value
at its outlet.
3
It is installed at the water mains (for a bungalow as for a flat). It protects the whole installation from problems due to excess
pressure: noises in the pipes, water hammer, splashes, premature wear of household electrical appliances and taps.
The pressure reducing valves are completely automatic.
WATER SAvINGS
Water represents a major part of household budgets.
Not wasting it makes for real savings, but do you know that 30% of water used in a house is heated.
Less pressure means less water used, and therefore less energy consumed.
Through its low load losses, the WATTS INDUSTRIES pressure reducing valves allow the obtaining of a normal flow rate
when water in drawn in several places simultaneously.
The toilet flushing is less noisy and the taps no longer splash.
Example with a tap running for 10 minutes.
A considerable amount of the distributed water is directly dumped into the sewer without even having been truly used (see
illustration above).
Reducing the pressure, all in obtaining comfort in use, allows for real savings.
In all cases, make a regular check of the condition of the tap and toilet flusher seals: a leak consumes a lot more water than
you think ! (sometimes up to 3 m 3 per day for a private household).
PRESSURE REDUCING vAlvES OR REGUlATORS
We use the standardised official term « REDUCER », but a pressure reducing valve is highly sensitive to upstream pressure
variations, and regulates badly without water flowing (without drawing).
The WATTS INDUSTRIES direct action pressure reducing valves (PRECISIO, U5B, REGLEAU) regulate the downstream
pressure as well with or without water flowing (without drawing). The downstream pressure only varies by 8% from the
upstream pressure variation. These appliances are therefore PRESSURE REGULATORS.

PRESSURE REDUCING vAlvES
WATTS, THE INvENTOR OF THE REGUlATOR
4
• In 1876: Invention, manufacturing and marketing of the first regulator.
It was somewhat complicated, took up a lot of space (nearly 2 metres high), but it worked.
• 1930: A half century had already gone by.
Everything was designed – the principle of the direct action regulator valve with
diaphragm operating the flap valve, the interior shape, the general look.
• From this date, most regulators made in the world were inspired by or copied this format.
The unique design of the WATTS pressure reducing valve makes it insensitive to scale or impurities, and needs no
maintenance.
The diaphragm, spring, seat and flap valve are largely dimensioned for precise and constant regulation all in allowing high
flow rates.
A corrosion-free spring (1) with a large spiral and highly sensitive:
it guarantees precise adjustment. The pressure control is within the
1,5 to 5,5 bar range.
A high-temperature diaphragm (2) and a flap valve (3):
resist high temperatures (up to 80°C).
A stainless steel seat (4): an exclusivity that protects from wear
and water aggressivity. Give a long-life guarantee.
A single-unit body in non-dezincificable brass (5) (DZR):
highly robust, this metal is resistant to corrosion and satisfies the
new health standards on the compatibility of materials in contact
with drinking water.
A yoke and flap valve assembly (6): single-piece moving part in
non-dezincificable brass (DZR), the yoke includes a flap valve (3)
that is largely dimensioned, allowing higher performance
to standard requirements.
PRECISIO, U5B and REGLEAU use this direct action technique, with yoke and diaphragm.
HOW TO CHOOSE THE DIAMETER OF PRESSURE REDUCING vAlvES
Practical rule: the pressure reducing valve is generally chosen according to the diameter of the installed pipe, provided,
of course, that the latter is of the right size.
The choice of pipe diameters must follow the rules of the trade and must conform to the standards in force.
Refer to the flow rate curves of each pressure reducing valve, given in the technical documents.

PRESSURE REDUCING vAlvES
INSTAllATION
WATTS pressure reducing valves may be installed in all positions.
They are generally installed directly after the water meter, and thus
protect the whole installation.
5
PRECISIO has 2 side connections and not a single one under
the appliance unlike similar valves offered in the market.
Advantage of a pressure gauge connection on the front: when 2 tubes are parallel with the wall, one above the other.
The pressure gauge
is easily screwed
onto one of the
two side connections.
The tube underneath makes it
impossible to mount the pressure
gauge directly on most pressure
reducing valves on the market.
HOW TO ADJUST A PRESSURE REDUCING vAlvE
THE ADJUSTMENT MUST BE DONE WITHOUT FLOW – NO DOWNSTREAM OUTFLOW.
The WATTS INDUSTRIES pressure reducing valves are factory preset at 3 bar.
They remain adjustable within a 1,5 to 5,5 bar range.
• To increase the pressure, tighten the adjusting screw (clockwise as you look at the screw
from above).
• To reduce the pressure, undo the adjusting screw (anticlockwise as you look at the
screw from above), slightly open a tap for a moment, close again, then tighten the screw
again until you obtain the desired pressure.
Two 1/4" gauge ports are located on each side of the valve when a pressure gauge
is required to be fitted.
When opening the downstream tap (drawing), it is
normal to see the pressure drop: this is the load loss
of the appliance.
PRECAUTIONS
This value is given in the appliance flow rate curves
(see technical documents).
WATTS INDUSTRIES direct action water pressure reducing valves are insensitive to scale or impurities, and need no
maintenance or particular precautions provided that they are installed according to the rules of the trade.
However, if there is a risk of back pressure or water hammer in the downstream circuit, you are advised to protect the
pressure reducing valve by a non-return valve placed immediately downstream.
Typical connection conforming to health and technical requirements:
Pressure reducing valve NF
PRECISIO
multi-threaded M 3/4” - F 1/2”
Anti-pollution
non-return valve NF
Water meter
Faster and more practical, the multi-threaded models 86315 or 86216 are installed
directly after the water meter and/or after the anti-pollution non-return valve.

PRESSURE REDUCING vAlvES
PRESSURE GAUGE: THE ESSENTIAl ACCESSORY
6
The pressure gauge allows direct reading of the pressure, and thus allows precise
adjustment of the pressure reducing valve to local installation conditions.
WATTS INDUSTRIES designs, manufactures and markets a wide range of pressure
gauges for buildings and industry.
Over the years, through the successive acquisition of FIMET and the German company
Förster & Rothmann, the WATTS INDUSTRIES group has become a key player in the
European instrumentation market.
The pressure gauge should not remain under pressure – the installation of an isolating
valve is recommended.
EUROPEAN STANDARD EN 1567 AND THE bRAND NF
The brand NF guarantees the observance of standards for using household electrical appliances and taps.
PRECISIO has the right to use the NF EN 1567 brand, and ensures user comfort and preservation of installations:
by distributing a normal flow rate during simultaneous drawings, thanks to its low load loss.
PRECISIO reduces the noise of running water. It facilitates the adjustment of mixers, by reducing the water hammer effect
and avoiding rattling and vibrations in the pipes, characteristic phenomena of excessive pressure.
PRECISIO helps towards saving water by avoiding waste (leakage from pipes, taps and toilet flushers).
Through its design, it keeps its characteristics in time regardless of the water quality.
SANITARY CONFORMITY (ACS / WRAS)
These certificates assure the sanitary approvals - according to local requirements -
A.C.S. (F) and WRAS (GB).
PRESSURE REDUCING vAlvES, THE WATTS INDUSTRIES EXPERTISE
WATTS, inventor of the modern pressure reducing valve concept, designs and manufactures
a complete range for all needs.
WATTS pressure reducing valves offer:
- The best for you and your customers, because depending on quality products ensures peace of mind.
- Easy installation: PRECISIO and REGLEAU are interchangeable with the main pressure reducing
valves on the market. They can be installed in all positions.
- Savings: WATTS pressure reducing valves are sold at a competitive price.
They ensure real water savings for your customers. They pay for themselves quickly.
- Conformity to standards, the quality of the materials used, the NF brand,
the health conformity attestation, etc. are all guarantees for your installations.
- Reliability: manufacturing under quality assurance ISO 9001 (version 2008)
in our plant at HAUTVILLERS OUVILLE (80 – Somme).
- By experience acquired on the job, the success of REDUFIX is due to installers insisting on this product,
with more than 20 years on the market.

PRESSURE REDUCING vAlvES
CASE OF ElECTRICAl HOT WATER STORAGE HEATER:
As the water temperature increases, the pressure also rises
within the heater chamber (water expansion).
For safety reasons, this pressure must be limited to a value
under the safety pressure of the tank. This function is ensured
by the safety group, which is set at 7 bar (standard NF-
D 36401 - EN1487).
An aggravating factor – the consumption of water during the
night drops considerably, which has the consequence of increasing
pressure in the public drinking water network.
Now, it is generally during the night that the heating period
is triggered (case of electric meters with off-peak time rates).
Thus the heating of the water adds to the increase of water
mains pressure, and causes the pressure in the hot water
storage heater to reach the safety valve set-point,
producing a water outflow higher than water expansion.
To avoid this water outflow (drinking and heated),
it is necessary to install a pressure reducing valve,
that will protect the immersion tank from excess pressure.
REDUFIX is an especially designed pressure reducing valve
for this function.
It is a good-looking design, very discreet and compact, perfect
for built-in under counter electrical immersion
heaters.
Dielectric insulating connection
Thermostatic
Mixing valves MMV-C
Mixed water
Hot water
Cold water inlet
hot water
storage heater
Cold water inlet
Pressure reducing valve
REDUFIX
Safety group
SFR 3/4"
Deflector
Trap funnel kit
Drainage
7
CASE OF TOWER blOCKS:
Case No. 1: 6-storey building - « Normal » water mains pressure: 6 bar - Desired pressure in each flat: 3 bar.
In the case of a residential building, it is advisable to install a pressure reducing valve at the input of each flat,
and not a centralised pressure reducing valve at the bottom of the building.
Why : we should consider a height of 3 metres for each storey, a load loss per storey of 0.3 bar.
Therefore, if you install a single central pressure reducing valve at the bottom of the building adjusted to 3 bar,
the first storeys will be supplied at the right pressure, but the more you go up the storeys, the more the pressure will drop.
For example, the 6 th floor will have only 1.4 bar of available pressure, too low.
It is therefore necessary to install the same pressure reducing valve, adjusted to 3 bar, at the entry of each flat.

PRESSURE REDUCING vAlvES
Case No. 2: Building of more than 6-storeys - « High » water mains pressure: 10 bar -
Desired pressure in each flat: 3 bar.
8
In the case of a residential building where the mains water pressure is very high, you are advised to install on the main
inlet a pressure reducing valve of a larger diameter, which will firstly reduce the pressure to 6 bar, and a pressure
reducing valve adjusted to 3 bar at the entry of each flat.
The vertical columns are thus protested by the larger pressure reducing valve, and each level by a smaller pressure
reducing valve to give a pressure of 3 bar.
Remark: For very high buildings, the highest storeys do not require the installation of a pressure reducing valve when
the pressure is less than 3 bar.
Case No. 3: Building of more than 6-storeys - « Low » water mains pressure: 3 bar
Desired pressure in each flat: 3 bar.
In this case, the installation of a pressure booster is necessary.
This will be adjusted to a value of 5 or 6 bar, the purpose being to obtain adequate pressure at all floors.
It is therefore necessary to install the same pressure reducing valve, adjusted to 3 bar, at the entry of each flat.
Remark: again, for very high buildings, the highest storeys do not require the installation of a pressure reducing valve
when the pressure is less than 3 bar.

PRESSURE REDUCING vAlvES
Guide of applications
To choose the most suitable products, follow the applications below.
APPLICATION
MODEL
Pressure
maxi (bar)
Pressure setting
range (bar)
Diameters
availables
Pages
9
Protecting electric hot water
storage heaters
and household appliances
➤
➤
REDUFIX
REDUBAR
15
15
1,5 to 5
1,5 to 4
1/2” to 3/4”
1/2” to 3/4”
10
11
➤
REDUBLOC 15 1,5 to 4 3/4” 11
Building and domestic
installations
➤
REDUFIX
15
1,5 to 5
1/2” to 3/4”
10
➤
REDUBAR
15
1,5 to 4
1/2” to 3/4”
11
➤
➤
REDUBLOC 15 1,5 to 4 3/4” 11
REDUPRESS 16 1,5 to 5,5 1/2” to 3/4” 14
➤
PRECISIO
25
1,5 to 5,5
1/2” to 3/4”
12 - 13
Collective installations
➤
➤
REDUBLOC 15 1,5 to 4 3/4” 11
REDUPRESS 16 1,5 to 5,5 1/2” to 3/4” 14
➤
PRECISIO
25
1,5 to 5,5
1/2” to 3/4”
12 - 13
➤
REGLEAU
20
1,5 to 5,5
1” to 3”
15
➤
DRVD
16
1,5 to 6
DN 50
to DN 200
17
➤
PR500
25
1 to 7
DN 50
to DN 250
18 - 19
Industrial installations
➤
REDUBLOC
15
1,5 to 4
3/4”
11
➤
PRECISIO
25
1,5 to 5,5
1/2” to 3/4”
12 - 13
➤
REGLEAU
20
1,5 to 5,5
1” to 3”
15
➤
DRVD
16
1,5 to 6
DN 50
to DN 200
17
➤
PR500
25
1 to 7
DN 50
to DN 250
18 - 19

PRESSURE REDUCING vAlvES
10
Pressure reducing valve REDUFIX
Pressure reducing valve with piston and diaphragm,
is designed for protecting single appliance like hot water
storage heaters and household appliances.
It is directly fitted upstream of the appliance that you want
to protect or to water circuit inlets that you want to protect
(kitchen, bathrooms, garden piping etc.).
ref. code: 82000 - F/F 1/2”
± 0,31 kg
Body and head in DZR brass, corrosion resistant.
Finish: nickel plated.
Diaphragm in NBR.
Female 1/4” pressure gauge outlet.
• Compact
Takes up less space, easier to fit, and is unobtrusive
underneath hot water storage heaters.
• Any position
The REDUFIX can be fitted in any position.
• Robust
ref. code 82210:
special for safety group
Once fitted you can forget it. The REDUFIX does not
require any special maintenance.
• Silent
The valve system design and types of seals used ensure
operation with no vibration and no rattling about.
ref. code: 82210 and 82211
M 3/4”/F free union nut 3/4”
± 0,36 kg
• Specific discharge
Discharge is appropriate to isolated appliances like washing
machines or hot water storage heaters. It performs a role in
better thermostatic mixer control and controlled water
consumption.
• Practical
Its Female 1/4” pressure gauge port is located on the front
and not under the valve.
Max. inlet pressure: 15 bar. Max. temperature: 70°C.
Factory preset at 3 bar (± 0,5) adjustable from 1,5 to 5 bar.
ref. code: 82110 - M/M 3/4”
± 0,32 kg
ref. code: 82215
F 3/4” free union nut/M 3/4”
± 0,36 kg
Pressure drop diagram
ref. code: 82007
double threaded
M3/4” F1/2” - M3/4” F1/2”
± 0,32 kg
Under the following conditions: 8 bar inlet, 3 bar outlet.
diameter presentation ref. code
F/F 1/2” (15x21) box 82000
M/F 3/4” free union nut (20x27) box 82210
M/F 3/4” free union nut (20x27) under hull 82211
F 3/4” free union nut/M 3/4” (20x27) box 82215
M/M 3/4” (20x27) box 82110
M/M 3/4” and F/F 1/2” (double threaded) box 82007
DN 15 compression fitting box 82114
DN 22 compression fitting box 82115
ref. code: 82114
compression fitting 15 mm
ref. code: 82115
compression fitting 22 mm
± 0,34 kg ± 0,38 kg

PRESSURE REDUCING vAlvES
Pressure reducing valve REDUbAR
ref. code 82500:
special for safety group and
electric hot water storage heater
Compact pressure reducing valve.
Redubar is an ideal pressure reducing valve for protecting
electric hot water storage heaters, household appliances
and vending machines.
Internal mechanism in synthetic material to reduce
the possibility of scaling.
• Factory preset at 3 bar ± 0,5 (2,5 to 3,5 bar)
can be set from 1,5 to 4 bar.
• Maintenance free and robust device.
• Brass body nickel plated and/or plain finished.
• Slotted adjusting screw that can be turned with
a flathead screwdriver.
Max. temperature: 70°C.
Max. inlet pressure: 15 bar.
11
Under the following conditions: 8 bar inlet
3 bar outlet
Male/Female free nut 3/4” (20x27).
Multi-threaded Male 3/4” and Female 1/2” at inlet and outlet.
Ref. 82500 Ref. 82501
diameter ref. code packaging
Male/Female free nut 3/4” (20x27) special for safety group 82500 40
Multi-threaded Male 3/4” and Female 1/2” at inlet and outlet 82501 40
REDUblOC 3.1
Single device intended for water connection,
combining 3 functions in one body.
1. Isolating Valve
2. Pressure reducing valve
3. Approved controllable check valve
• Easy mounting.
• Respect for standards.
• Competitive price.
• Reduced weight and dimension.
• 3 times less time to install.
• Simple construction ensuring reliability and longevity.
Max. temperature: 70°C.
Max. inlet pressure: 15 bar.
95 mm Maxi
mm Maxi
95
water
inlet
direct monting by
union free nut 3/4”
Pressure reducing valve factory set at 3 bar.
The setting is adjustable between 1,5 and 4 bar.
Controllable check valve approved.
downstream:
double threading
M 3/4”- F 1/2”
Flow rate
37.5 mm37.5 mm 49 mm 49 mm
86.5 mm86.5 mm
53.5 mm
53.5 mm
mm
35
mm
35
18.5 mm18.5 mm
53.5 mm
35 mm
86.5 mm
37.5 mm 49 mm
18.5 mm
water meter
3/4”M (20x27)
check valve
checking plug
Head loss
diameter ref. code packaging
F 3/4” free nut (20x27) x M 3/4” / F 1/2” 82900 25
F 3/4” free nut (20x27) x M 3/4” / F 1/2” with checking pressure gauge 82901 25
95

PRESSURE REDUCING vAlvES
Pressure reducing valve PRECISIO M2
12
ref. 86300
Pressure reducing valve with yoke and diaphragm.
Reduce the water pressure without reduce the flow.
Precisio M2 brings comfort by lowering the noise of water
circulation and respecting acoustic norms.
Reliable and without maintenance.
Non-dezincificable (DZR) brass body.
Diaphragm and a high temperature yoke assembly.
Stainless steel seat.
The adjustment is reliable and precise thanks to the screwand-nut
system.
Precisio is interchangeable with most market appliances.
2 pressure gauge ports F 1/4” (8x13).
Precisio M2 can be fitted in any position.
Max. inlet pressure: 25 bar.
Adjustable: 1,5 to 5 bar.
Delivered preset at 3 bar.
Max. temperature: 80°C.
Standard NF approved EN 1567.
PRECISIO multi-threaded (composite or brass cover)
is issued with 2 reversible multi-threaded connectors with free nuts.
External male
DN 20x27 (3/4”)
External male
DN 20x27 (3/4”)
ref. 86315
or
or
Internal female
DN 15x21 (1/2”)
Internal female
DN 15x21 (1/2”)
Reversible
Female 3/4”
Male 1/2”
Male 1/2”
Female 3/4”
ref. 86200
DOWNSTREAM
UPSTREAM
Male
DN 15 - 1/2”
Male
DN 20 - 3/4”
Female
DN 15 - 1/2”
Female
DN 20 - 3/4”
ref. 86216
Male
DN 15
1/2”
Male
DN 20
3/4”
Female
DN 15
1/2”
Female
DN 20
3/4”
± 0,864 kg ± 0,796 kg ± 0,796 kg
± 0,864 kg
154 mm
approx.*
± 0,796 kg
127 mm
approx.
± 0,796 kg
127 mm
approx.
143 mm
approx.*
127 mm
approx.
100 mm
approx.
100 mm
approx.
117 mm
approx.*
127 mm
approx.
± 0,729 kg ± 0,729 kg
100 mm
approx.
± 0,729 kg ± 0,729 kg
100 mm
approx.
117 mm
approx.*
143 mm
approx.*
± 0,796 kg
117 mm
approx.*
± 0,796 kg
117 mm
approx.*
± 0,864 kg ± 0,796 kg
± 0,796 kg
± 0,864 kg
132 mm
approx.*
* measured in relation to the support surface of the piping nozzle on which the joint is going to apply.

PRESSURE REDUCING vAlvES
Precisio M2
multi-threaded
3/4”-1/2”
ref.: 86315
issued with 2
reversible
connectors
± 0,864 kg
Precisio M2
FF 3/4”
ref.: 86300
± 0,654 kg
13
Precisio
multi-threaded
3/4”-1/2”
ref.: 86216
issued with 2
reversible
connectors
± 1,230 kg
Precisio
FF 3/4”
ref.: 86200
± 1,020 kg
Precisio multi-threaded
connected in F/F 1/2”
Head loss (bar)
Precisio F/F 3/4” and
multi-threaded
connected in M/M 3/4”
Flow (L/min)
ref. 86300 ref. 86216
ref. 86200
ref. 86315
diameter type ref. code
F/F 3/4” (20x27) Precisio M2 F/F 3/4” 86300
Multi-threaded 3/4” - 1/2” + 2 reversible connectors Precisio M2 multi-threaded 86315
F/F 3/4” (20x27) Precisio brass F/F 3/4” 86200
Multi-threaded 3/4” - 1/2” + 2 reversible connectors Precisio brass multi-threaded 86216

PRESSURE REDUCING vAlvES
14
Pressure reducing valve REDUPRESS
Pressure reducing valve with piston and diaphragm.
Ideal pressure reducing valve for domestic, commercial and
industrial installations:
Individual water supply for low-cost building sites (flat,
bungalow, etc.).
Max. inlet pressure: 16 bar.
Two 1/4" (8x13) side connections for pressure gauge.
Body: corrosion resistant DZR brass, nickel finished.
Diaphragm in EPDM.
Adjustment of setting by screw on the top of the cover.
Max. temperature: 80°C.
Adjustable: 1,5 to 5,5 bar.
SPECIAL LOW PRESSURE MODEL*:
Adjustable: 0,5 to 2,5 bar.
Max. inlet pressure: 8 bar.
Flow: 25 L/min. under 0,5 bar.
F/F 3/4”
Pressure drop diagram for standard REDUPRESS 1,5 to 5,5 bar
F/F 1/2”
M/M 3/4”
diameter type of pressure ref. code
F/F 1/2” standard pressure 81100
* F/F 1/2” low pressure 81106
F/F 3/4” standard pressure 81116
* F/F 3/4” low pressure 81113
M/M 3/4” standard pressure 81015
F/F 1/2” with pressure gauge standard pressure 81101
F/F 3/4” with pressure gauge standard pressure 81117
M/M 3/4” with pressure gauge standard pressure 81016
Pressure gauge 0 to 10 bar 66206

PRESSURE REDUCING vAlvES
Pressure reducing valve REGlEAU G.C.
Pressure reducing valve with disc-yoke and diaphragm.
• Yoke and diaphragm assembly: cast solid moving part highly
sensitive spring and large diaphragm permits accurate
adjustment and excellent performances.
• Stainless spring with large coils and high sensitivity:
it guarantees a precise adjustment.
• Diaphragm and valve high temperature: resisting high
temperatures (up to 70°C).
Max. temperature: 70°C.
Max. inlet pressure:
until 20 bar.
Adjustable: 1,5 to 5,5 bar.
Delivered preset at 3 bar.
Flow: until 40 m 3 /h.
Assembly any position.
15
• Stainless steel seat: an exclusive design which protects the
valve from the aggressive wear of water.
A guarantee of longevity.
For hot or cold water.
Seat: stainless steel.
Body: bronze.
Models 1” and 1”1/4
Models 2”1/2 and 3”
Head loss (bar)
Head loss (bar)
Models 1”1/2 and 2”
Flow rate (litres/mn)
Head loss (bar)
Flow rate (litres/mn)
Flow rate (litres/mn)
diameter A (mm) B (mm) C (mm) type ref. code
F/F 1” (26x34) 121 54 165 Regleau G.C. 28602
F/F 1”1/4 (33x42) 127 70 172 Regleau G.C. 28603
F/F 1”1/2 (40x49) 171 70 251 Regleau G.C. 28604
F/F 2” (50x60) 203 86 273 Regleau G.C. 28605
F/F 2”1/2 By-pass (66x76) 200 73 273 Regleau G.C. 28616
F/F 3” By-pass (80x90) 267 105 324 Regleau G.C. 28617

PRESSURE REDUCING vAlvES
Pressure reducing valve with by-pass U5b
16
Pressure reducing valve with yoke and diaphragm,
with built-in filter and by-pass.
• Inlet swivel union nuts.
• Built in filter easily removable, upstream of the device.
• Large spring and diaphragm for a precise adjustment.
• Maintainability without special tools.
• Horizontal or vertical assembly, fluid going up.
Diaphragm: Nordel with nylon.
Valve: Buna.
Body bronze, seat and spring stainless steel.
Max. inlet pressure:
until 20 bar.
Adjustable: 1,5 to 5,5 bar.
Delivered preset at 3 bar.
Max. temperature: 80°C.
Connection for pressure
gauge on request
U5B with 1/4” female pressure
U5B standard: without gauge port underneath valve
pressure gauge port (supplied with plug)
diameter A (mm) B (mm) C (mm) weight (kg) ref. code U5B Standard ref. code U5B pressure gauge
F/F 1/2” (15x21) 108 47 146 1,8 28100 28107
F/F 3/4” (20x27) 114 50 162 2,3 28101 28108
F/F 1” (26x34) 152 50 175 2,7 28102 28109
F/F 1”1/4 (33x42) 180 60 200 4,2 28103 28110
F/F 1”1/2 (40x49) 200 80 240 6,5 28104 28111
F/F 2” (50x60) 240 85 279 10,4 28105 28112
special pressure gauge for U5B - reversed reading 0/10 bar 66106
HYDROblOC
HYDROBLOC is a cold water or hot water supply unit
incorporating 5 functions:
- Direct assembly below meter by free nut.
- Isolating valve built into spherical brass valve.
- Testable antipollution check valve approved by WRAS,
KIWA, DVGW, NF, SVGW.
- Drain device for bleeding the downstream installation.
- Pressure reducing valve with yoke and diaphragm
with 2 pressure taps either side of the device.
Max. inlet pressure: 16 bar.
Adjustable: 1,5 to 5,5 bar.
Composition:
description
Meter connection by 3/4” free nut
Spherical 1/4 turn valve
Check valve test orifice
Antipollution check valve
Drain system (hexagon brass cap)
Pressure adjusting screw (1,5 to 5,5 bar approx.)
Pressure reducing valve
Connection for pressure gauge
F3/4” connection
Ideal to save time and space = 5 functions, 1 only assembly!
Two 1/4" (8x13) side ports for pressure gauge.
Rough brass finished.
Dimensions:
diameter
ref. code
HYDROBLOC - Female 3/4” free nut / female 3/4” 84050

PRESSURE REDUCING vAlvES
Pressure reducing valve with flanges DRvD PN16
Model with balanced valve and piston, guidance sleeve valve
machined and polished. EPDM reinforced seals.
Body ductile cast iron covered epoxy varnish.
Standard assembly in horizontal position (setting screw to
the top).
Ring cast iron. For cold water maxi. 40°C.
Plugs F 1/4” for pressure gauge on two sides of the body,
Standard: PN16 setting from 1,5 to 6 bar.
PN25 setting from 4 to 12 bar.
Max. inlet pressure: 16 bar.
Max. temperature: 40°C.
Kits of seals or springs availables.
On request: setting kit 2 to 8
bar or 4 to 12 bar (specify the
DRVD diameter).
17
diameter setting range type ref. code packaging
DN 50 1,5 to 6 bar DRVD PN16 L 05.04.053 1
DN 65 1,5 to 6 bar DRVD PN16 L 05.04.068 1
DN 80 1,5 to 6 bar DRVD PN16 L 05.04.083 1
DN 100 1,5 to 6 bar DRVD PN16 L 05.04.103 1
DN 125 1,5 to 6 bar DRVD PN16 L 05.04.128 1
DN 150 1,5 to 6 bar DRVD PN16 L 05.04.153 1
DN 200 (on request) 1,5 to 6 bar DRVD PN16 L 05.04.203 1
Pressure reducing valve with flanges DRvD PN25
Identical model to the standard DRVD above but PN25 and setting from 4 to 12 bar.
Consult us for the time.
diameter setting range type ref. code packaging
DN 50 4 to 12 bar DRVD PN25 L 05.04.050 1
DN 65 4 to 12 bar DRVD PN25 L 05.04.065 1
DN 80 4 to 12 bar DRVD PN25 L 05.04.080 1
DN 100 4 to 12 bar DRVD PN25 L 05.04.100 1
DN 125 4 to 12 bar DRVD PN25 L 05.04.125 1
DN 150 4 to 12 bar DRVD PN25 L 05.04.150 1
Spring kits (2 to 8 bar)
ref. code
type
L 05.99.070 DF 8/DRVD 50
L 05.99.071 DF 8/DRVD 65
L 05.99.072 DF 8/DRVD 80
L 05.99.073 DF 8/DRVD 100
L 05.99.075 DF 8/DRVD 150
Seals kits (PN 16 & PN 25)
diameter type ref. code
DN 50 JT/DRVD L 05.99.200
DN 65 JT/DRVD L 05.99.201
DN 80 JT/DRVD L 05.99.202
DN 100 JT/DRVD L 05.99.203
DN 125 JT/DRVD L 05.99.204
DN 150 JT/DRVD L 05.99.205
DN 200 JT/DRVD L 05.99.206
Seals bag for DRVD.
Spring kits (4 to 12 bar)
ref. code
type
L 05.99.080 DF 12/DRVD 50
L 05.99.081 DF 12/DRVD 65
L 05.99.082 DF 12/DRVD 80
L 05.99.083 DF 12/DRVD 100
L 05.99.084 DF 12/DRVD 125
L 05.99.085 DF 12/DRVD 150
L 05.99.086 DF 12/DRVD 200
models DN L (mm) H (mm) h (mm) F (mm)
DRV-D50 50 230 300 83 165
DRV-D65 65 290 350 90 185
DRV-D80 80 310 390 100 200
DRV-D100 100 350 440 121 220
DRV-D125 125 400 560 152 250
DRV-D150 150 450 670 169 285
DRV-D200 200 550 1050 234 340
Pressure reducing valve DRVD - DN 50 and 65 Pressure reducing valve DRVD - DN 80 and 100 Pressure reducing valve DRVD - DN 125, 150 and 200

PRESSURE REDUCING vAlvES
18
Pressure reducing valve
WATTS PR500
For all the drinkable water supply networks: building,
distribution of water, industry, pumping.
Stabilizes automatically the pressure downstream with the
regulated value.
Very simple pressure adjustment by system screw and nut.
Body cast iron covered epoxy integral interior, outside
Seat: stainless.
Standard assembly in horizontal position.
(Vertical assembly fluid going up: DN 50 to DN 150 only).
Max. pressure: 25 bar
Max. temperature: 20°C
Adjustable: 1 to 7 bar,
(see cavitation curves).
Simple construction.
Minimum maintenance.
Face
upstream pressure
gauge plug 3/8”
models DN PN A (mm) B1 (mm) B2 (mm) C1 (mm) C2 (mm) weight (kg) pressure gauge plug
PR500-50 50 16 230 170 85 165 95 25 F 3/8”
PR500-65 65 16 290 170 85 165 95 25 F 3/8”
PR500-80 80 16 310 175 85 165 100 30 F 3/8”
PR500-100 100 16 350 190 120 210 110 40 F 1/2”
PR500-125 125 16 400 200 150 285 125 70 F 1/2”
PR500-150 150 16 480 210 150 285 145 90 F 1/2”
PR500-200 200 16 600 235 200 360 170 150 F 1/2”
PR500-250 250 16 730 280 255 475 200 400 F 1/2”
Top
downstream pressure
gauge plug 3/8”
1 - Body / Main valve
2 - Fixed orifice
3 - Flow strainer
4 - Pilot valve
5 - Air vent
6 - Flexible tubing
diameter range type ref. code.
DN 50 1 to 7 bar PR500 PN16 500 050 548
DN 65 1 to 7 bar PR500 PN16 500 065 548
DN 80 1 to 7 bar PR500 PN16 500 080 548
DN 100 1 to 7 bar PR500 PN16 500 100 548
DN 125 1 to 7 bar PR500 PN16 500 125 548
DN 150 1 to 7 bar PR500 PN16 500 150 548
DN 200 1 to 7 bar PR500 PN16 505 200 548
DN 250 1 to 7 bar PR500 PN16 505 250 548

PRESSURE REDUCING vAlvES
Hydraulic characteristics:
Cavitation: If the differential of pressure between the
upstream and the desired downstream is too large, then
it will be necessary to reduce the pressure in several
stages by the installation of a series of pressure reducing
valves.
A high inlet pressure and a low downstream pressure
can cause a deterioration of the valve by cavitation.
To avoid this phenomenon, please refer to the curves
hereafter.
19
Repair kits:
Cavitation
(unautorized)
Possibility of cavitation
(not recommended)
No cavitation
(recommended)
Example:
15 bar upstream, 1 bar downstream = cavitation, unauthorized
10 bar upstream, 4 bar downstream = no cavitation, authorized
designation DN marks (draw) part no.
SET 1 - disc and diaphragm assembly (internal NBR parts), including: axis, diaphragm, diaphragm disc, axis nut, brace
washer, disc guide, seals and seat disc, disk support
Internal set 2” (EU100 DN050/065/080) 50 / 65 / 80 4, 5, 8, 9, 10, 11, 12, 14, 15 500050920
Internal set 3” (EU100 DN100)" 100 4, 5, 8, 9, 10, 11, 12, 14, 15 500080920
Internal set 4” (EU100 DN125/150) 125 / 150 4, 5, 8, 9, 10, 11, 12, 14, 15 500100920
Internal set 6” (EU100 DN200) 200 4, 5, 8, 9, 10, 11, 12, 14, 15 500150920
Internal set 8” (EU100 DN250) 250 4, 5, 8, 9, 10, 11, 12, 14, 15 500200920
SET 2 - valve base set (internal NBR parts), including: diaphragm, brace washer, seals and seat disc
Internal set 2” (EU100 DN050/065/080) 50 / 65 / 80 5, 10, 11, 14 500050900
Internal set 3” (EU100 DN100) 100 5, 10, 11, 14 500080900
Internal set 4” (EU100 DN125/150) 125 / 150 5, 10, 11, 14 500100900
Internal set 6” (EU100 DN200) 200 5, 10, 11, 14 500150900
Internal set 8” (EU100 DN250) 250 5, 10, 11, 14 500200900
SET 3 - seat set (stainless steel), including: stainless steel seat
Seat set 2” (EU100 DN050/065/080) 50 / 65 / 80 13 500050910
Seat set 3” (EU100 DN100) 100 13 500080910
Seat set 4” (EU100 DN125/150) 125 / 150 13 on request
Seat set 6” (EU100 DN200) 200 13 on request
Seat set 8” (EU100 DN250) 250 13 on request
Pilot 263AP brass body/aluminium cover 50 to 250 500/4 44001
Other replacement parts
Fixing ring 10 mm plastic 50 to 250 500/2 500000047
Calibration strainer 10 mm stainless steel 50 / 65 / 80 500/3 544010122
Calibration strainer 15 mm stainless steel 100 / 125 / 150 / 200 / 250 500/3 544015122
Air vent 3/8” nickel plated brass 50 / 65 / 80 500/5 900257110
Air vent 1/2” nickel plated brass 100 / 125 / 150 / 200 / 250 500/5 on request
Flexible tubing 10 mm plastic PA 50 to 250 500/6 503000900
Flexible tubing set with fittings 50 500/6 (with fittings) 503050946
Flexible tubing set with fittings 65 500/6 (with fittings) 503065946
Flexible tubing set with fittings 80 500/6 (with fittings) 503080946
Flexible tubing set with fittings 100 500/6 (with fittings) 503100946
Flexible tubing set with fittings 125 500/6 (with fittings) 503125946
Flexible tubing set with fittings 150 500/6 (with fittings) 503150946
Flexible tubing set with fittings 200 500/6 (with fittings) 503200946
Flexible tubing set with fittings 250 500/6 (with fittings) 503250946

Product range Watts Industries
- System disconnectors
- Backflow protection devices
- Check valves
- Safety units
- Safety relief valves
- Pressure reducing valves
- Automatic control valves
- Butterfly valves
- Shut off valves
- Measuring gauges
- Temperature control
- Expansion vessels
- Process switches
- Fuel products
- Gas products
- Electronic controls
- Installation protection products
- Radiator valves
- System products
- Manifolds and fittings
Re-order no. 55-UK-2012/11
WATTS INDUSTRIES France
1590 avenue d'Orange CS 10101 SORGUES 84275 VEDENE cedex - FRANCE
Phone +33 (0)4 90 33 28 28 - Fax +33 (0)4 90 33 28 29/39
www.wattsindustries.com - E-mail : info@wattsindustries.fr