Watts DRV Series Instruction Manual

WattsIndustries.com

DRV, DRVM, DRVN,

DRVMN Series

Pressure reducing valves

Technical Data Sheet

Watts Water Technologies, Inc.

Spare unions complete with nut and seals for DRV Series pressure reducing valves.

R/DRV

Type Part No. DN Weight (Kg)

R/DRV 0599001 1/2” MM 0,1

R/DRV 0599002 3/4” MM 0,2

R/DRV 0599003 1” MM 0,3

R/DRV 0599004 1.1/4” MM 0,5

R/DRV 0599005 1.1/2” MM 0,7

R/DRV 0599006 2” MM 1,1

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

CW617N brass body and cap. Stainless steel strainer. Polymer valve seat.

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

water, air and neutral gases up to 60°C, in accordance to DVGW up to 30°C. Pressure

drops less than 1.3 bar at characteristic flow rate.

Noise < 20 dB - Class 1 according with DIN 52218. LAG (DN 15÷32)

Compliant with DVGW, SVGW. Metallic materials in accordance with UBA LIST.

DRV

Type Part No. DN Weight (Kg)

DRV 0501115 1/2” MM 0,9

DRV 0501120 3/4” MM 1,2

DRV 0501125 1” MM 1,7

DRV 0501132 1.1/4” MM 3,1

DRV 0501140 1.1/2” MM 5,1

DRV 0501150 2” MM 6,3

The DRV, DRVM, DRVN, DRVMN Series pressure reducing valves are devices capable of reducing the pressure of the

fluid downstream to a desired level and keeping it constant even in the presence of major variations in the flow rate and/or

pressure upstream, by modifying its pressure drops.

Like DRV, but with M1-ABS50 Series pressure gauge (Scale 0-6 bar).

DRVM

Type Part No. DN Weight (Kg)

DRVM 0501315 1/2” MM 0,9

DRVM 0501320 3/4” MM 1,3

DRVM 0501325 1” MM 1,8

DRVM 0501332 1.1/4” MM 3,5

DRVM 0501340 1.1/2” MM 5,1

DRVM 0501350 2” MM 6,3

Spare regulator unit complete with cartridge, diaphragm and O-Ring for DRV Series

pressure reducing valves.

GRDRV

Tipo Part No. DN Weight (Kg)

GRDRV 0599025 1/2” MM 0,1

GRDRV 0599026 3/4” MM 0,1

GRDRV 0599027 1” MM 0,2

GRDRV 0599028 1.1/4” MM 0,3

GRDRV 0599029 1.1/2” MM 0,9

GRDRV 0599030 2” MM 1,0

Description

Watts Water Technologies, Inc.

Patented diaphragm pressure reducing valve with compensated seat, outlet pressure

adjustable with a knob and external graduated scale for easy reading of set pressure.

Complete with unions. Body of CW617N sand-blasted stamped brass.

Stainless steel filter cartridge. Pressure gauge connection on both sides: G1/4”.

Maximum 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 according with DIN 52218

Compliant with DVGW. Metallic materials in accordance with UBA LIST.

DRVN

Type Part no. DN Weight (Kg)

DRVN 0502515 1/2” MM 0,6

DRVN 0502520 3/4” MM 0,9

DRVN 0502525 1” MM 1,3

DRVN 0502532 1.1/4” MM 2,1

DRVN 0502540 1.1/2” MM 3,4

DRVN 0502550 2” MM 4,2

Like DRVN but with M3A-ABS50 Series pressure gauge (Scale 0÷6 bar).

DRVMN

Type Part no. DN Weight (Kg)

DRVMN 0502615 1/2” MM 0,7

DRVMN 0502620 3/4” MM 1,0

DRVMN 0502625 1” MM 1,4

DRVMN 0502632 1.1/4” MM 2,2

DRVMN 0502640 1.1/2” MM 3,5

DRVMN 0502650 2” MM 4,3

Technical features: DRV and DRVN

Maximum upstream pressure 25 bar

Downstream pressure (outlet) 1,5÷6 bar

Connections M/M tailpiece

Downstream pressure adjustment (screw 4) Clockwise rotation: increases pressure

Anticlockwise rotation: decreases pressure

Downstream pressure gauge (DRV-M only) Pressure gauge Ø50 scale 0÷6 bar

Maximum operating temperature DRVN 30°C

Maximum operating temperature DRV 60°C (30°C DVGW)

Design features: DRV and DRVN

Body Sand blasted CW617N

Cap Sand-blasted/(DRV) CW617N,

Reinforced polymer (DRVN)

Plug Brass CW617N

Inlet/outlet connections Brass CW617N

Diaphragm NBR reinforced with nylon fabric compliant with KTW and

W270 - KTW

Seal and O-Ring NBR - KTW - W270

Spring Galvanized steel

Adjusting screw and lock nut Brass CW617N

Filters Stainless steel

Watts Water Technologies, Inc.

Pressure reducing valves are used:

• In sanitary systems

- to keep the pressure of the water constant in the distribution network downstream of the valve

- to avoid excessive withdrawals of water by controlling the pressure at the tap

- to keep the water pressure constantly below the maximum value allowed

• In compressed air systems

- to keep the pressure constant in the network, irrespective of the oscillations in the pressure supplied by the

compressors

• Downstream of storage tanks or cylinders

- to reduce and stabilize the pressure in the network, which is normally lower

The pressure reducing valves are used not only for water but also for air and non-aggressive gases.

The DRV, DRVM, DRVN, DRVMN Series pressure reducing valves are compensated seat type. This means that as the

inlet pressure acts on the two openings A and B (see Fig.1) having the same cross section, it is compensated and does not

therefore result in any force on the pin-plug system when the opening angle of the valve is varied. The outlet pressure acts

on the diaphragm and thus also on the pin–plug system, which is thus subjected to two contrasting forces: the force exerted

by the outlet pressure, which tends to close the plug and the force exerted by the spring, which tends to open it. As a result,

the compensated seat valve has an outlet pressure virtually insensitive to variations in pressure upstream.

DRV DRVN

Features:

1 Body

2 Cap

3 Adjustment knob

4 Setting screw

5 Spring

6 Diaphragm

7 Inlet connection

8 Pin

9 Plug

10 Filters

11 Outlet connection

Features:

1 Body

2 Cap

3 Lock nut

4 Setting screw

5 Spring

6 Diaphragm

7 Inlet connection

8 Pin

9 Plug

10 Guide bushing

11 Filters

12 Outlet connection

Fig.1

Fig.2

10 9

Application

Operation

Watts Water Technologies, Inc.

The difference between the downstream pressure P2 measured with no flow and the same pressure measured at

the generic flow rate Q represents the pressure drop DP of the pressure reducing valve. It depends on the flow

rate, as indicated by the pressure drop diagrams. If you want the downstream pressure never to exceed a given

value P2, you must regulate this to value P2 with no flow. At flow Q, the downstream pressure will be less than

value P2 by an amount equivalent to the pressure drops DP. If the pressure reducing valve is installed to

guarantee that the downstream pressure reaches a given value P2 at a given flow rate Q, this pressure must be

regulated to value P2 + DP with no flow. At flow rate Q, the downstream pressure will be equivalent to P2.

The criterion for choosing the pressure reducing valve consists in determining the diameter in such a way that the speed of

the fluid does not reach excessively high values, at the rated flow rate, causing excessive pressure drop and outflow noise

transmitted to the distribution network. The flow rate-speed diagrams help you to choose the diameter of the pressure

reducing valve in the case of liquids (see water) or gases at pressures of 8-10 bar (see air).

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).

Example 2 (flow rate)

DRV/N pressure reducing valve with:

Inlet pressure (minimum) P1=8 bar

Outlet pressure P2=4 bar

Maximum flow rate Q = 50 l/min

From the flow rate-speed diagram, it can be deduced that a 20 or 25 diameter should be used.

From the pressure drop diagram, the following two cases emerge:

DRV20/N Q = 50 l/min Dp=1.1 bar

DRV25/N Q = 50 l/min Dp=0.68 bar

Setting

Sizing

Exemples of sizing

Watts Water Technologies, Inc.

The cavitation diagram shows three operating zones of the pressure reducing valve plotted against the upstream and downstream

pressures, namely:

C zone: normal duty, no cavitation

B zone: medium duty, risk of cavitation

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

Continuous operation in the red cavitation zone could cause rapid damage of the internal parts. If the pressure reducing valve is to

operate in the red zone, contact the Technical Department of Watts Industries Italia.

01 2 3

Downstream pressure (bar)

4 5 6 7

Inlet pressure (bar)

A Cavitation Zone B Transition Zone C Work Zone

Flow rate

Speed (m/s)

DN15

0,6

0,4

0,2

0,1

0,1 0,2 0,4 0,6 0,8 246102060 200 1000

1840 100 400 600

10 50 100 1000 100005 500 5000

0,8

Acqua

Aria

m3/h

l/min

DN20

DN25

DN32

DN40

DN50

Cavitation

Cavitation diagram

Charts

DRV-DRVN

Watts Water Technologies, Inc.

Flow rate

0,08

0,1

0,2

0,3

0,6

0,4

Pressure drop

bar

l/m

0,8

12 43568 20 3010 40 60 80 100 200 400

DRV50

DRV40

DRV32

DRV25

DRV20

DRV15

0,08

0,1

0,2

0,3

0,6

0,4

Pressure drop

Flow rate

bar

l/m

0,8

12 43568 20 3010 40 60 80 100 200 400

DRVN50

DRVN40

DRVN32

DRVN25

DRVN20

DRVN15

DRV

DRVN

Watts Industries Italia S.r.l.

Via Brenno, 21 • 20853 Biassono (MB) • Italy

Tel. +39 039 4986.1 • Fax +39 039 4986.222

infowattsitalia@wattswater.com • www.wattsindustries.com

The descriptions and photographs contained in this product specification sheet are supplied by way of information only and are not binding.

Watts Industries reserves the right to carry out any technical and design improvements to its products without prior notice. Warranty: All sales and contracts for sale are expressly

conditioned on the buyer’s assent to Watts terms and conditions found on its website at www.wattsindustries.com. Watts hereby objects to any term, different from or additional to

Watts terms, contained in any buyer communication in any form, unless agreed to in a writing signed by an officer of Watts.

DRV-DRVM-DRVN-DRVMN-TS-IT-W-UK-09-17-Rev2

DRV-DRVM

DN L L1 H H1

1/2” 97 152 136 48

3/4” 110 171 155 58

1” 114 175 176 66

1.1/4” 140 211 227 75

1.1/2” 159 245 253 82

2” 175 261 263 88

DRVN-DRVMN

DN L L1 H H1

1/2” 84 135 113 16,5

3/4” 94 151 133 20,5

1” 104 161 140 26

1.1/4” 109 175 192 29,5

1.1/2” 134 214 200 36

2” 144 224 205 42

Overall dimensions (mm)

DRV Series

Diaphragm pressure regulator with compensated seat complete with tailpiece WATTS brand DRV Series, with threaded

male thread DN 1/2 “-2”. Brass body CW617N. NBR membrane with nylon insert. Stainless steel internal filter. Noise: <20db

Class 1 in Germany. PN 25 bar. Adjustable downstream pressure: 1.5-6 bar with calibration screw. Maximum operating

temperature: 60°C (30°C DVGW). Compliant with DVGW, SVGW.

DRVM Series

Diaphragm pressure regulator with compensated seat complete with tailpiece WATTS brand DRV Series, with threaded male

thread DN 1/2 “-2”. Model with pressure gauge M1-ABS50 series scale 0-6 bar.Brass body CW617N. NBR membrane with

nylon insert. Stainless steel internal filter. Noise: <20db - Class 1 in Germany. PN 25 bar. Adjustable downstream pressure:

1.5-6 bar with calibration screw. Maximum operating temperature: 60°C (30°C DVGW). Compliant with DVGW, SVGW.

DRVN Series

Diaphragm pressure regulator with compensated seat complete with tailpiece WATTS brand DRVN Series, with threaded

male thread DN 1/2 “-2”. Brass body CW617N. NBR membrane with nylon insert. Stainless steel internal filter. Noise: <20db

Class 1 in Germany. DN 1/4 “pressure gauge on both sides. PN 25 bar. Adjustable downstream pressure: 1.5-6 bar with

manual knob and external graduated scale. Maximum operating temperature: 30°C. Compliant with DVGW.

DRVNM Series

Diaphragm pressure regulator with compensated seat complete with tailpiece WATTS brand DRVN Series, with threaded

male thread DN 1/2 “-2”. Brass body CW617N. NBR membrane with nylon insert. Stainless steel internal filter. Noise: <20db

Class 1 in Germany. Model with pressure gauge Series M1-ABS50 scale 0-6 bar. PN 25 bar. Adjustable downstream

pressure: 1.5-6 bar with manual knob and external graduated scale. Maximum operating temperature: 30°C.

Compliant with DVGW.

Specification text

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