d en-drv gb - Watts Industries

Presssure reducing valve EN-DRV
with modular cartridge and set point scale
EN-DRV
EN-DRV/F
EN 1567
• Pressure reducing valves EN-DRV are designed to protect water installations against excessive
pressure from the water supply.
They are used for household installation, industrial or commercial applications.
EN-DRV/R
• Balancing principle: pressure set is maintained
at a constant level.
• Outlet pressure indicator.
• European standard EN 1567.
• High acoustic performances.
• Modular cartridge construction.
• Simple adjustment for installer.
• Wide product range.
• High corrosion resistance.
• Unique filtering system.
• Robust and low complexity construction
providing superior reliability and longevity.

PREssuRE REDuciNg VAlVE • EN-DRV
2
Application:
• The pressure reducing valve EN-DRV is designed for water systems.
The device reduces and stabilizes automatically the outlet pressure at the set value. It effectively prevents
damages that can be caused by pressure increase. The pressure reducing valve EN-DRV reduces the water
consumption.
• Medium : water.
Working principle :
pressure adjusting
knob
upstream
downstream
Without flow :
The spring, in relation with the size of the diaphragm,
helps the downstream pressure to push the
diaphragm upwards.
The obturator is closed.
The pressure is maintained at the calibrated value.
With flow :
The force of the diaphragm operates against the
force of the adjustment spring.
The strength of the spring moves downwards the
obturator, allowing the water to pass. If the outlet
pressure and therefore diaphragm force fall because
water is drawn, the greater force of the spring
causes the opening of the valve.
Design:
✓ Robust and low complexity construction providing superior reliability and longevity.
✓ Compact and light weight: competitive valve price.
✓ Removable modular cartridge with adjustment knob and setting scale.
✓ Made in non-stick materials.
✓ Minimizes the limescale deposit.
✓ Can be easily removed for inspection or maintenance operations.
✓ Set pressure is directly indicated on the set point scale.
✓ Factory setting: 3 bar.
✓ Simple adjustment for installer.
✓ Dezincification resistant brass housing.
Features and benefits:
- The balancing principle:
EN-DRV range is based on the balancing of two opposing
forces:
➪ the strength of the inlet pressure towards the closing of
the seat, and on the top of the piston,
➪ the equal surface area of the upper side of the piston
and for the obturator.
Compensated seats
With this principle of compensated seats, the set pressure
is maintained constant, even when there is an important
inlet pressure fluctuation.
- The pressure set is maintained at a constant level:
• over-pressure damages are avoided,
• lower flow noises in the installation,
• water consumption is reduced.

PREssuRE REDuciNg VAlVE • EN-DRV
- Outlet pressure indicator:
The pressure reducing valve EN-DRV is equipped with
an outlet pressure indicator (see fig. 1) that displays the
set pressure. These 2 set point scales are located on
each side of the valve, so that the pressure indicator is
always visible.
As a result, an additional pressure gauge is not fully
necessary.
Figure 1
Preadjustement
3
- European standard EN 1567:
The EN-DRV pressure reducers fully comply with the
requirements of the new European Standard EN1567.
EN 1567
- Acoustic performances:
Low noise approved Up to size 1”1/4 - Group 1 without limitations
- The modular cartridge construction:
• complete cartridge with diaphragm and valve seat
• fine filter mesh 0,71 mm
• high quality synthetic material
• can be fully exchanged without using special tools
• all synthetic parts getting in contact with water are
approved and made in non-stick materials
• this minimizes the limescale deposit
- Wide product range:
The product range is split into three distinct categories :
• EN-DRV: pre-adjustable reducer, with pressure gauge connection, and fine filter on the cartridge (mesh size 0,71mm).
• EN-DRV/R: features similar to EN-DRV but with a brass cap (without set point scale).
• EN-DRV/F: features similar to EN-DRV but with an inspectable filter of high capacity inside a synthetic clear bowl.
Filter in stainless steel, mesh size 0,28mm.
EN-DRV
EN-DRV/R
brass cap (without outlet
pressure indicator)
EN-DRV/F
inspectable filter
of high capacity

PREssuRE REDuciNg VAlVE • EN-DRV
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- High corrosion resistance:
The corrosion resistance in particular is guaranteed for all used materials. The housing is made of dezincification resistant
brass (DZR).
- Unique filtering system:
The high capacity inspectable filter cartridge can be unscrewed without using special tools (which is not the case of
others solutions available on the market).
Unlike other pressure reducing valves, the transparent bowl is NOT the container of debris. Debris are blocked into a
special transparent 3 legs storage.
This operational principle provides many advantages :
➪ when a draw-off outlet is opened on the water system, the debris are NOT into the flow, this does not affect the quality
of the water,
➪ the flow capacity is not reduced or disturbed by the amount of debris as they are stocked into a storage,
➪ the low pressure losses of EN-DRV series are guaranteed whatever the level of clogging.
The transparent filter cartridge (storage and bowl) can be visually checked and easily removed for cleaning and maintenance
work.
specifications:
• Connections sizes: Unions threaded 1/2”, 3/4”, 1”, 1”1/4, 1”1/2, 2”, and Comp. fitting 15mm, 22mm.
• Pressure setting range downstream: EN-DRV, EN-DRV/R, EN-DRV/F: 1 to 6 bar (1 to 5,5 bar for NF approved model).
• Pressure gauge connection: two 1/4” F are located on each side of the valve.
• Max. upstream pressure: 25 bar, (EN-DRV/F: 16 bar).
• Max. working temperature: - EN-DRV, EN-DRV/R: 70°C
- EN-DRV/F: 40°C.
Range :
Diameter Type Version Code ref.
M/M 1/2” EN-DRV standard 83000
M/M 3/4” EN-DRV standard 83100
M/M 1” EN-DRV standard 83200
M/M 1”1/4 EN-DRV standard 83300
M/M 1”1/2 EN-DRV standard 83400
M/M 2” EN-DRV standard 83500
M/M 1/2” EN-DRV/F filter 83010
M/M 3/4” EN-DRV/F filter 83110
M/M 1” EN-DRV/F filter 83210
M/M 1”1/4 EN-DRV/F filter 83310
M/M 1”1/2 EN-DRV/F filter 83410
M/M 2” EN-DRV/F filter 83510
M/M 1/2” EN-DRV/R brass cap 83030
M/M 3/4” EN-DRV/R brass cap 83130
M/M 1” EN-DRV/R brass cap 83230
M/M 1”1/4 EN-DRV/R brass cap 83330
M/M 1”1/2 EN-DRV/R brass cap 83430
M/M 2” EN-DRV/R brass cap 83530
Diameter Type Version Code ref.
M/M 1/2” EN-DRV NF 83020
M/M 3/4” EN-DRV NF 83120
M/M 1” EN-DRV NF 83220
M/M 1”1/4 EN-DRV NF 83320
M/M 1”1/2 EN-DRV NF 83420
M/M 2” EN-DRV NF 83520
Multi-threaded F1/2” M3/4” EN-DRV NF 83121
Comp. fitting 15mm EN-DRV standard 83600
Comp. fitting 22mm EN-DRV standard 83601
EN-DRV standard with pressure gauge
M/M 1/2” EN-DRVM standard 83001
M/M 3/4” EN-DRVM standard 83101
M/M 1” EN-DRVM standard 83201
M/M 1”1/4 EN-DRVM standard 83301
M/M 1”1/2 EN-DRVM standard 83401
M/M 2” EN-DRVM standard 83501
EN-DRV brass cap with pressure gauge
M/M 1/2” EN-DRV/RM brass cap 83031
M/M 3/4” EN-DRV/RM brass cap 83131
M/M 1” EN-DRV/RM brass cap 83231
M/M 1”1/4 EN-DRV/RM brass cap 83331
M/M 1”1/2 EN-DRV/RM brass cap 83431
M/M 2” EN-DRV/RM brass cap 83531

PREssuRE REDuciNg VAlVE • EN-DRV
Approvals: pending process, please refer to the WATTS local company.
EN-DRV Code ref. DN
83000 15x21
83100 20x27
83200 26x34
83300 33x42
83400 40x49
83500 50x60
EN-DRV/R Code ref. DN
83030 15x21
83130 20x27
83230 26x34
83330 33x42
83430 40x49
83530 50x60
EN-DRV/F Code ref. DN
83010 15x21
83110 20x27
83210 26x34
83310 33x42
83410 40x49
83510 50x60
EN-DRV Code ref. DN
compression 83600 15
fitting 83601 22
EN-DRV NF Code ref. DN
83020 15x21
83120 20x27
83220 26x34
83320 33x42
83420 40x49
83520 50x60
83121 15x21- 20x27
EN-DRV/NF
multi-threaded
F1/2” M3/4”
ref : 83121
5
Materials :
Materials EN-DRV EN-DRV/R EN-DRV/F
Body DZR brass DZR brass DZR brass
Cover Grivory Brass Grivory
Cartridge body + seat Hostaform Hostaform Hostaform
Spring Zinc plated steel Zinc plated steel Zinc plated steel
Seals EPDM EPDM EPDM
Diaphragm EPDM EPDM EPDM
Filter Stainless steel Stainless steel Stainless steel
Transparent bowl - - PA 12
All materials in contact with water are approved : WRAS (UK), KTW and W270 (D), ACS (F).
Dimensions & weight:
Ref. Description A B C D E F G
83000 EN-DRV union 1/2” G1/2” G3/4” 53,5 96 80 56,5 136 ± 2 mm
83100 EN-DRV union 3/4” G3/4” G1” 53,5 96 90 56,5 151 ± 2 mm
83200 EN-DRV union 1” G1” G1”1/4 53,5 96 100 56,5 170 ± 2 mm
83300 EN-DRV union 1”1/4 G1”1/4 G1”1/2 65 150 105 79 178 ± 2 mm
83400 EN-DRV union 1”1/2 G1”1/2 G2” 65 150 130 79 215 ± 2 mm
83500 EN-DRV union 2” G2” G2”1/2 65 150 140 79 239 ± 2 mm
83010 EN-DRV/F union 1/2” G1/2” G3/4” 53,5 96 80 56,5 136 ± 2 mm
83110 EN-DRV/F union 3/4” G3/4” G1” 53,5 96 90 56,5 151 ± 2 mm
83210 EN-DRV/F union 1” G1” G1”1/4 53,5 96 100 56,5 170 ± 2 mm
83310 EN-DRV/F union 1”1/4 G1”1/4 G1”1/2 78 150 105 79 178 ± 2 mm
83410 EN-DRV/F union 1”1/2 G1”1/2 G2” 78 150 130 79 215 ± 2 mm
83510 EN-DRV/F union 2” G2” G2”1/2 78 150 140 79 239 ± 2 mm
83020 EN-DRV/NF union 1/2” G1/2” G3/4” 53,5 96 80 56,5 136 ± 2 mm
83120 EN-DRV/NF union 3/4” G3/4” G1” 53,5 96 90 56,5 151 ± 2 mm
83220 EN-DRV/NF union 1” G1” G1”1/4 53,5 96 100 56,5 170 ± 2 mm
83320 EN-DRV/NF union 1”1/4 G1”1/4 G1”1/2 65 150 105 79 178 ± 2 mm
83420 EN-DRV/NF union 1”1/2 G1”1/2 G2” 65 150 130 79 215 ± 2 mm
83520 EN-DRV/NF union 2” G2” G2”1/2 65 150 140 79 239 ± 2 mm
83121 EN-DRV/NF multi-threaded F1/2” M3/4” - F1/2” M3/4 53,5 96 80 56,5 -
83030 EN-DRV/R union 1/2” G1/2” G3/4” 46 88,5 80 56,5 136 ± 2 mm
83130 EN-DRV/R union 3/4” G3/4” G1” 46 88,5 90 56,5 151 ± 2 mm
83230 EN-DRV/R union 1” G1” G1”1/4 46 88,5 100 56,5 170 ± 2 mm
83330 EN-DRV/R union 1”1/4 G1”1/4 G1”1/2 65 140 105 79 178 ± 2 mm
83430 EN-DRV/R union 1”1/2 G1”1/2 G2” 65 140 130 79 215 ± 2 mm
83530 EN-DRV/R union 2” G2” G2”1/2 65 140 140 79 239 ± 2 mm
83600 EN-DRV comp. fitting 15 mm 15 mm G1/2” 46 88,5 80 56,5 -
83601 EN-DRV comp. fitting 22 mm 22 mm 1”1/8 46 88,5 80 56,5 -

PREssuRE REDuciNg VAlVE • EN-DRV
Flow diagram - Pressure drop :
6
EN-DRV
EN-DRV/F
EN-DRV/R
EN-DRV-NF
Nominal flow :
The water flow rates in the table below, are for each size with a velocity of 2m/s according standard EN1567.
Ø 1/2” 3/4” 1” 1”1/4 1”1/2 2”
Q (m3/h) 1,27 2,27 3,6 5,8 9,1 14
Q (L/min) 21,17 37,83 60,00 96,67 151,67 233,33
Fitting instructions :
• The pressure reducer must be installed by qualified plumbers in accordance with the instructions given by the
Installation & Maintenance manual in the box, and following current local regulations.
• The pressure reducer can be installed in either horizontal or vertical pipework, between two isolating valves
upstream and downstream. Do not install the valve upside down. For the model with transparent bowl filter EN-
DRV/F, it can only be installed in horizontal position with transparent bowl downwards.
• The device must be installed in an accessible area that is large enough for maintenance and to prevent it getting
submerged by any accidental flooding and to avoid the pressure reducer being damaged by frost.
• During installation it is necessary to note the direction of flow as indicated by the arrow on the body of the device.
Maintenance :
The pressure reducer is a safety device and therefore requires periodical inspection. Watts Industries recommends
that the EN-DRV should be inspected at least once a year.
- Test : 1 – turn off the outlet shut off valve,
2 – with a manometer, check the pressure on the outlet side with no flow (gauge plug 1/4” is fitted on the
device),
➜ if pressure slowly rises, then go to the maintenance below.

PREssuRE REDuciNg VAlVE • EN-DRV
Maintenance of the cartridge:
- Cleaning and/or replacing the cartridge : the modular concept of the cartridge allows an easy exchange when
installed:
1 – Close the shut off valves on the inlet and outlet.
2 – Remove the upper cover of the cartridge by unscrewing it at its base (hexagonal design),
the upper cover is integral with the internal cartridge (modular cartridge system).
3 – Clean and check the seals and the filter of the cartridge (filter only for models EN-DRV
and EN-DRV/R).
Screw the cartridge back into the brass body.
4 – The modular cartridge can be replaced with a new one (for models EN-DRV
and EN-DRV/F) by simply screwing a new spare into the body.
The new cartridge may require setting if needed
(please refer to “Installation and commissioning”).
5 – Slowly open the shut off valves on the inlet and outlet.
Clean the filter of the cartridge
EN-DRV and EN-DRV/R
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Maintenance of the filter:
- Cleaning the high capacity filter for EN-DRV/F with transparent bowl :
1 – Close the shut off valves on the inlet and outlet.
2 – With a hexagonal key, unscrew the transparent bowl under the EN-DRV/F (hexagonal internal shape).
3 – Remove the filter, clean it and replace it back into position.
4 – Lightly grease the O’ring and the thread of the bowl.
5 – Screw filter bowl back into place.
6 – Slowly open the shut off valves on the inlet and outlet.
Spare parts:
Monobloc
cartridge :
ref. 83901K
sizes DN15 to 25
ref. 83902K
sizes DN32 to 50
Union, connections and gaskets :
2 Male BSP union 1/2” ref. 83913K
2 Male BSP union 3/4” ref. 83914K
2 Male BSP union 1” ref. 83915K
2 Male BSP union 1”1/4 ref. 83916K
2 Male BSP union 1”1/2 ref. 83917K
2 Male BSP union 2” ref. 83918K
2 - 15mm compression ref. 83920K
2 - 22mm compression ref. 83921K
Monobloc
cartridge :
ref. 83905K
sizes DN15 to 25
ref. 83906K
sizes DN32 to 50
= Set of 3 cartridge o-rings
ref. 83911K sizes DN15 to 25
réf. 83912K sizes DN32 to 50
Monobloc
cartridge :
ref. 83903K
sizes DN15 to 25
ref. 83904K
sizes DN32 to 50
Black Plug + ‘O’ring :
ref. 83907K
sizes DN15 to 25
Gauge plug G1/4
+ ‘O’ring : ref. 83919K
Filter system :
ref. 83909K
sizes DN15 to 25
ref. 83910K
sizes DN32 to 50
Gauge plug
G1/4
+ ‘O’ring :
ref. 83919K
Plug + ‘O’ring :
ref. 83908K
sizes DN15 to 25
Gauge plug
G1/4
+ ‘O’ring :
ref. 83919K
EN-DRV EN-DRV/F EN-DRV/R
J Outstanding customer service : product widely distributed across Europe.
J Quality guaranteed : made by WATTS Industries with ISO 9001:2008 certified plant in EU.

Product range Watts industries
- System disconnectors
- Backflow protection devices
- Check valves
- Safety groups
- 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(7)-UK-08/07
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