Danfoss WVFX 10, WVS 50, WVS 80, WVS 100 Data sheet

Data Sheet

Pressure operated water valve Type WVFX and WVS

Opens on rising condensing pressure

Pressure operated water valves types WVFX and WVS are used for regulating the ow of water in refrigeration plants with water-cooled condensers.

The pressure operated water valves give modulating regulation of the condensing pressure within dened limits during operation. When the refrigeration plant is stopped, the cooling water ow is shut o automatically.

Pressure operated water valves can be used with ammable refrigerants. Double sealing between the refrigerant and the water line ensures that in case the bellows damage and the refrigerant leak, it cannot enter into the water. This severely limits the safety implications. It means that the valve can be used together with a double walled heat exchanger and water circuit in such a system does not need to be considered as a part of the installation for ammable refrigerants (EN378-1:2008, clause 4.4.2.2).

Features

• Media: Fresh water and Neutral brine

• Needs no power supply – self acting

• Opens on rising condensing pressure

• Complete ow range from 1.4 – 300 m3/h

• Low ow version of WVFX – 0,63 m3/h, (available on request)

• Insensitive to dirt

• WVFX 10 – 25 are available in stainless steel housing

• Suitable for ammable refrigerants

• May be used in the following EX range: Category 3 (Zone 2)

AI250886497511en-001401

Danfoss

3N162

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7

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12345678910Handwheel

Spring housing

Spindle guide

Spring retainer

O-ring

Guide bush

Diaphragm

Valve cone

Thrust pad

Bellows element

Pressure operated water valve, Type WVFX and WVS

Functions

Condensing pressure impulses are transmitted via the bellows element to the valve cone so that the valve – even at very small pressure variations – is able to adapt the quantity of water required by the condenser.

The valves are pressure-relieved in such a way that a variation in the water pressure will not aect their setting.

To protect the refrigeration plant against high head pressures in the event that the water supply to the condenser fails, a safety switch type KP or RT should be tted on the high pressure side.

Water side connections are internal BSP and the compressor discharge side connection is

1

⁄4 in. / 6 mm are.

The valve body WVFX 10 – 25 is made of hot-stamped brass and for WVFX 32 – 40 of cast iron. WVFX 15, WVFX 20 and WVFX 25 can also be supplied in stainless steel housing.

All metal external valve parts are surface-treated to resist corrosion from condensate, etc.

It is possible to order reverse acting WVFX valve, which opens on refrigerant pressure decrease.

Reverse acting valve are mostly used in bypass lines and heat pump applications.

Figure 1: Design / Function for WVFX 10 – 25

The valve cone (8) is a brass plate with a vulcanized layer of articial rubber to form an elastic seal against the valve seat. The valve is externally sealed by the diaphragms (7).

The top and bottom of the valve plate holder are extended by a guide that is tted with O-rings (5) to ensure the internal operating parts move correctly. These O-rings, tted in conjunction with the diaphragms, also provide extra protection against external leakage.

The valve seat is made of stainless steel and is pressed to the valve body.

The spring housing (2) is of aluminium and has a guide slot for the spring holder that is extended in the form of an indicating pointer. An associated indicator label is riveted to the housing and is graduated from 1 – 5.

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Bellows element

Upper pressure spindle

Top plate

Guide bush gland

Guide bush

T-ring

Valve cone

O-ring

Lower pressure spindle

Spring housing

Handwheel

Danfoss

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20

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Pressure operated water valve, Type WVFX and WVS

Figure 2: Design / Function for WVFX 32 – 40

The valve cone (7) is made of brass with a T-ring (6) of articial rubber forming a exible seal against the valve seat. The O-rings (8) are external seals for the cooling water.

The valve cone guide bushes (5) are specially treated to counteract lime deposits from the cooling water inside the cylinder, and also to reduce friction in the valve to a minimum.

The valve seat is made of stainless steel and is pressed to the valve body.

The spring housing (2) is of aluminium and has a guide slot for the spring holder that is extended in the form of an indicating pointer.

Figure 3: WVS 32

Figure 4: WVS 40

Figure 5: WVS 50 – 100

1

2

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10a1112131415161718

1920212223

24

Pressure connection (are

nipple)

Pressure connection (weld

nipple)

Bellows element

Push rod

Regulating nut

Spring housing

Cover

Pilot assembly

Spindle for pilot cone

Teon sleeves

Insulating gasket

Gasket

O-ring

Valve cover

O-ring

Servo piston

Bottom screw

Drain plug

Gasket

Strainer assembly, complete

Self-cleaning strainer

assembly

Pilot orice

Gasket

O-ring

Servo spring

Pressure operated water valve, Type WVFX and WVS

WVS 32 – 40 valves have internal BSP connections, while WVS 50 – 100 can be supplied with either BSP connections or weld anges.

Connection to the plant condenser can be made by copper tube or steel tube, the valves being supplied with both a are nipple for

1

⁄4 in. (6 mm) copper tube and a weld nipple for ø6 mm / ø10 mm steel tube.

1. Main valve with servo piston

The main valve body is made of cast iron with a pressed-in bronze seat. The servo piston is of gun metal and has a sleeve and a proled rubber seal ring.

2. Pilot valve

The pilot valve is made of gun metal, the pilot cone and seat of stainless steel and the pilot orice of brass. These materials are particularly resistant to water corrosion. However, the valve is not resistant to sea water.

The strainer ahead of the pilot orice is made of nickel gauze.

The degree of opening of the pilot valve (which corresponds to the increase in condensing pressure above the set opening pressure) determines the degree of opening of the main valve and thereby amount of the water ow.

3. Bellows unit with connection to condenser

The bellows unit is made of aluminium and corrosion-proofed steel.

Type

Condenser side

Liquid side

Kv value

(1)

Refrigerant

Control press.

adjustable

opening press.

Max. working

pressure PS/MWP

Max. test pres‐

sure Pe

Media

Max. working

pressure PS/MWP

Max. test pres‐

sure Pe

[bar]

[m3/h]

WVFX 10

R22, R134a,

R290, R404A,

R407A, R407C, R407F, R407H,

R410A

(4)

, R422B, R422D, R448A, R449A, R449B, R450A, R452A, R454A, R454C, R455A, R507A, R513A, R515B,

R516A, R600,

R600a, R1234yf,

R1270

3.5 – 16.0

26.4

29.0

Fresh water,

neutral brine,

sea water

(3)

16241.4

WVFX 10

(2)

4.0 – 23.0

26.4

29.01624

1.4

WVFX 10

15.0 – 29.0

45.2

60.01624

1.4

WVFX 15

3.5 – 16.0

26.4

29.01624

1.9

WVFX 15 

(2)

4.0 – 23.0

26.4

29.01624

1.9

WVFX 15

15.0 – 29.0

45.2

60.01624

1.9

WVFX 20

3.5 – 16.0

26.4

29.01624

3.4

WVFX 20

(2)

4.0 – 23.0

26.4

29.01624

3.4

WVFX 20

15.0 – 29.0

45.2

60.01624

3.4

WVFX 25

3.5 – 16.0

26.4

29.01624

5.5

WVFX 25

(2)

4.0 – 23.0

26.4

29.01624

5.5

WVFX 25

15.0 – 29.0

45.2

60.01624

5.5

WVFX 32

4.0 – 17.0

24.1

26.51010

11.0

WVFX 40

4.0 – 17.0

24.1

26.51010

11.0

WVS 32

R22, R134a,

R290, R404A, R407A, R407C, R407F, R407H,

R410A

(4)

, R422B, R422D, R448A, R449A, R449B, R450A, R452A, R507A, R513A,

R600, R600a,

R717

(5)

, R1270

2.2 – 19.0

26.4

29.0

Fresh water,

neutral brine

101612.5

WVS 32

15.0 – 29.0

45.2

60.01016

12.5

WVS 40

2.2 – 19.0

26.4

29.01016

21.0

WVS 40

15.0 – 29.0

45.2

60.01016

21.0

WVS 50

2.2 – 19.0

26.4

29.01016

32.0

WVS 50

15.0 – 29.0

45.2

60.01016

32.0

WVS 65

2.2 – 19.0

26.4

29.01016

45.0

WVS 65

15.0 – 29.0

45.2

60.01016

45.0

WVS 80

2.2 – 19.0

26.4

29.01016

80.0

WVS 80

15.0 – 29.0

45.2

60.01016

80.0

WVS 100

2.2 – 19.0

26.4

29.01016

125.0

WVS 100

15.0 – 29.0

45.2

60.01016

125.0

Pressure operated water valve, Type WVFX and WVS

Product specication

Technical data

Table 1: Technical data

(1)

The Kv value is the ow of water in [m3/h] at a pressure drop across valve of 1 bar, ρ = 1000 kg/m3.

(2)

Fully open valve requires 33% higher pressure than a WVFX, range 3.5 – 16 bar.

(3)

WVFX 15, WVFX 20 and WVFX 25 with stainless steel housing only.

(4)

High pressure refrigerants version (45,2 MWP) only

(5)

WVS, WVFX 10 – 25 and WVO with are connection only; versions with capillary tube or with solder connections are not compatible with R717.

WVS, WVFX 10 – 25 and WVO with are connection only; versions with capillary tube or with solder connections are not compatible with R717. WVFX 32 and WVFX 40 are not compatible with R717

WVFX 32 and WVFX 40 are not compatible with R717

WVFX is evaluated for R290, R454A, R454C, R455A, R600, R600a, R1234yf, R1270 by ignition source assessment in accordance with standard EN ISO80079-36. Flare connections are only approved for A1 and A2L refrigerants.

WVS is evaluated for R290, R600, R600a, R1270 by ignition source assessment in accordance with standard EN ISO80079-36. Flare connections are only approved for A1 and A2L refrigerants.

For complete list of approved refrigerants, visit store.danfoss.com and search for individual code numbers, where refrigerants are listed as part of technical data

WVFX 10 – 40 are direct actuated valves. WVS 32 – 100 are servo-operated valves.

Media temperature range

• WVFX 10 – 25: -25 – 130 °C

• WVFX 32 – 40: -25 – 90 °C

• WVS: -25 – 90 °C

Danfoss WVFX 10, WVS 50, WVS 80, WVS 100 Data sheet

Specifications and Main Features

Frequently Asked Questions

User Manual