Data sheet
Pressure operated water valve
Type WVFX and WVS
Pressure operated water valves types WVFX and
WVS are used for regulating the flow of water in
refrigeration plants with water-cooled
condensers.
The pressure operated water valves give
modulating regulation of the condensing
pressure within defined limits during operation.
When the refrigeration plant is stopped, the
cooling water flow is shut off automatically.
Pressure operated water valves can be used with
flammable 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 flammable refrigerants
(EN378-1:2008, clause 4.4.2.2).
Features • Media: Fresh water and Neutral brine
• Refrigerants: HCFC, HFC and HC
• Needs no power supply – self acting
• Opens on rising condensing pressure
• Complete flow range from 1.4 – 300 m3/h
• Low flow version of WVFX – 0,63 m3/h,
(available on request)
• Insensitive to dirt
• WVFX 10 – 25 are available in stainless steel
housing
• Suitable for flammable refrigerants
• May be used in the following EX range:
Category 3 (Zone 2)
© Danfoss | DCS (az) | 2018.10
DKRCC.PD.DA0.3A.02 | 1
Data sheet | Pressure operated water valve, types WVFX and WVS
Technical data
Condenser side Liquid side
Typ e
Refrigerant
Control
press.
adjustable
opening
press.
Max.
working
pressure
PS/MWP
Max.
test
pressure
P
e
Media
Max.
working
pressure
PS/MWP
Max.
test
pressure
Pe
Kv value 1)
[bar] [bar] [bar] [bar] [bar] [m3/h]
WV FX 10
3.5 – 16.0 26.4 29.0
16 24 1.4
WVFX 10 2) 4.0 – 23.0 26.4 29.0 16 24 1.4
WV FX 10 15.0 – 29.0 45.2 60.0 16 24 1.4
WVFX 15 3.5 – 16.0 26.4 29.0 16 24 1.9
WVFX 15 2) 4.0 – 23.0 26.4 29.0 16 24 1.9
WVFX 15 15.0 – 29.0 45.2 60.0 16 24 1.9
WVFX 20 3.5 – 16.0 26.4 29.0 16 24 3.4
WVFX 20 2) 4.0 – 23.0 26.4 29.0 16 24 3.4
WVFX 20 15.0 – 29.0 45.2 60.0 16 24 3.4
WVFX 25 3.5 – 16.0 26.4 29.0 16 24 5.5
WVFX 25 2) 4.0 – 23.0 26.4 29.0 16 24 5.5
WVFX 25 15.0 – 29.0 45.2 60.0 16 24 5.5
WVFX 32 4.0 – 17.0 24.1 26.5 10 10 11. 0
WVFX 40 4.0 – 17.0 24.1 26.5 10 10 11.0
WVS 32 2.2 – 19.0 26.4 29.0
WVS 32 15.0 – 29.0 45.2 60.0 10 16 12.5
WVS 40 2.2 – 19.0 26.4 29.0 10 16 21.0
WVS 40 15.0 – 29.0 45.2 60.0 10 16 21.0
R22 , R127 0,
R13 4a, R 29 0,
R404A,
R4 07A,
R407C,
R407 F,
R410A 4),
R448A,
R449A,
R450A,
R452A,
R507A,
R513A, R600,
R600a,
R717 5)
WVS 50 2.2 – 19.0 26.4 29.0 10 16 32.0
WVS 50 15.0 – 29.0 45.2 60.0 10 16 32.0
WVS 65 2.2 – 19.0 26.4 29.0 10 16 45.0
WVS 65 15.0 – 29.0 45.2 60.0 10 16 45.0
Fresh
water,
neutral
brine, sea
water 3)
10 16 12.5
Fresh
water,
neutral
brine
WVS 80 2.2 – 19.0 26.4 29.0 10 16 80.0
WVS 80 15.0 – 29.0 45.2 60.0 10 16 80.0
WVS 100 2.2 – 19.0 26.4 29.0 10 16 125.0
WVS 100 15.0 – 29.0 45.2 60.0 10 16 125. 0
1
The Kv value is the flow 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 flare 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
© Danfoss | DCS (az) | 2018.10
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
If a WVS is required with an opening differential
pressure of 1 – 10 bar, the valve servo spring
must be replaced.
See “Ordering”.
Opening differential pressure
WVFX 10 – 25: max. 10 bar
WVFX 32 – 40: max. 10 bar
WVS 32 – 40: min. 0.5 bar;
max. 4 bar
WVS 50 – 100: min. 0.3 bar;
max. 4 bar
Below 20% of max. capacity the WVS will act as
an on-off regulator.
DKRCC.PD.DA0.3A.02 | 2
Data sheet | Pressure operated water valve, types WVFX and WVS
Ordering WVFX, commercial type
Typ e
Code no.
Water side Condenser side [bar]
WVFX 10 G ³⁄₈ ¼ in. / 6 mm flare 3.5 – 16 003N1100
WVFX 10 G ³⁄₈ ¼ in. / 6 mm flare 4.0 – 23 003 N110 5
WVFX 15 G ½ ¼ in. / 6 mm flare 3.5 – 16 003N2100
WVFX 15 G ½ ¼ in. / 6 mm flare 4.0 – 23 003N2105
WVFX 15 G ½ ¼ in. / 6 mm flare nut 4.0 – 23 003N2205 2)
WVFX 20 G ¾ ¼ in. / 6 mm flare 3.5 – 16 003N3100
WVFX 20 G ¾ ¼ in. / 6 mm flare 4.0 – 23 0 03N3105
WVFX 20 G ¾ ¼ in. / 6 mm flare nut 4.0 – 23 003N3205 2)
WVFX 25 G 1 ¼ in. / 6 mm flare 3.5 – 16 003N4100
WVFX 25 G 1 ¼ in. / 6 mm flare 4.0 – 23 003N4105
WVFX 32 G 1 ¼ ¼ in. / 6 mm flare 4.0 – 17 0 03F12 32
WVFX 40 G 1 ½ ¼ in. / 6 mm flare 4.0 – 17 003F1240
Connection 1) Range
1
ISO 228-1
2
WVFX 15 with 1 m capillary tube and flare nut with valve depressor
WVFX, maritime type (stainless steel version)
Typ e
Water side Condenser side [bar]
WVFX 15 G ½ ¼ in. / 6 mm flare 3.5 – 16 003N2101
WVFX 15 G ½ ¼ in. / 6 mm flare 4.0 – 23 003N2104
WVFX 20 G ¾ ¼ in. / 6 mm flare 4.0 – 23 0 03N3104
WVFX 25 G 1 ¼ in. / 6 mm flare 3.5 – 16 003N 4101
WVFX 25 G 1 ¼ in. / 6 mm flare 4.0 – 23 003N4104
1
ISO 228-1
Connection 1) Range
Code no.
© Danfoss | DCS (az) | 2018.10
WVFX, commercial type (high pressure refrigerants, MWP 45.2 bar)
Typ e
Water side Condenser side [bar]
WV FX 10 G ³⁄₈ ¼ in. / 6 mm flare 15.0 – 29.0 003N1410
WVFX 15 G ½ ¼ in. / 6 mm flare 15.0 – 29.0 003N2410
WVFX 20 G ¾ ¼ in. / 6 mm flare 15.0 – 29.0 003N3410
WVFX 25 G 1 ¼ in. / 6 mm flare 15.0 – 29.0 0 03N4410
) ISO 228-1
Connection 1) Range
Code no.
DKRCC.PD.DA0.3A.02 | 3
Data sheet | Pressure operated water valve, types WVFX and WVS
Ordering
(continued)
WVS, commercial type
Code no.
Typ e Connection 1)
Valve body Pilot unit 3)
WVS 32 G 1 1⁄2 1) 016D5032 016D1017 016D1018 – 016D1327
WVS 40 G 1 1⁄2 1) 016D5040 016D1017 016D1018 – 016D0575
WVS 50 2 in. weld flange 016D5050 2) 016D1017 016D1018 027N3050 016D0576
WVS 65 2 1⁄2 in. weld flange 016D5065 2) 016D1017 016D1018 027N3065 016D0577
WVS 80 3 in. weld flange 016D5080 2) 016D1017 016D1018 027N3080 016D0578
WVS 100 4 in. weld flange 016D5100 2) 016D1017 016D1018 027N3100 016D0579
) ISO 228–1
) Parts included: valve body, flange gaskets, flange bolts and screws for pilot valve.
) Parts included: control element and spring housing.
) Parts included: 2 flanges
Pilot unit for
R410A and
R744 3)
Flange set 4)
Servo spring for
differential
pressure range
of 1 – 10 bar
Accessories
Description Code no.
1 m capillary tube 1⁄4 in. (6 mm) flare coupling nuts at each end 06 0- 01716 6
Bracket for WVFX 10 – 25 003N0388
Installation WVS and WVFX 32, WVFX 40 is to be fitted in the
cooling water inlet with flow in the direction of
the arrow and with the bellows element facing
upwards. Horizontal mounting is a must.
WVFX 10, WVFX 15 and WVFX 25 can be
mounted in any position. Horizontal mounting is
not required.
© Danfoss | DCS (az) | 2018.10
DKRCC.PD.DA0.3A.02 | 4
Data sheet | Pressure operated water valve, types WVFX and WVS
Capacity
[bar]
Standard servo spring type WVS
Special servo spring type WVS
Water Valves Offset – rise in condensing pressure
Typ e [bar] p
WV FX 10 2.0
WVFX 15 2.5
WVFX 20 3.0
WVFX 25 3.5
WVFX 32 40 3.0
WVS 32 0.6
WVS 40 0.7
WVS 50 80 0.8
WVS 100 0.9
The capacity curves show the capacities of
individual valves (water quantity in [m3/h])
depending on the pressure drop across valves.
The capacities given apply at 85% valve opening
and are obtained with the following offset
(rise in condensing pressure).
[m3/h]
© Danfoss | DCS (az) | 2018.10
DKRCC.PD.DA0.3A.02 | 5
Data sheet | Pressure operated water valve, types WVFX and WVS
Design / Function
1. Handwheel
2. Spring housing
3. Spindle guide
4. Spring retainer
5. O-ring
6. Guide bush
7. Diaphragm
8. Valve cone
9. Thrust pad
10. Bellows element
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
affect 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 fitted on the high
pressure side.
WVFX 10 – 25
Water side connections are internal BSP
and the compressor discharge side connection
is ¼ in. / 6 mm flare.
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.
The valve cone (8) is a brass plate with a
vulcanized layer of artificial 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 fitted with O-rings
(5) to ensure the internal operating parts move
correctly. These O-rings, fitted 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.
1. Bellows element
2. Upper pressure spindle
3. Top plate
4. Guide bush gland
5. Guide bush
6. T-ring
7. Valve cone
8. O-ring
9. Lower pressure spindle
10. Spring retainer
11. Spring housing
12. Regulating spring
13. Regulating spindle
14. Spring holder
© Danfoss | DCS (az) | 2018.10
The valve cone (7) is made of brass with
a T-ring (6) of artificial rubber forming a flexible
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 regulating spindle (13) is mounted
in a guide in the spring housing which has
a notch for the spring holder (14). The spring
holder also acts as an indicator.
WVFX 32 – 40
DKRCC.PD.DA0.3A.02 | 6
Data sheet | Pressure operated water valve, types WVFX and WVS
Design / Function
(continued)
1. Pressure connection
(flare nipple)
2. Pressure connection
(weld nipple)
3. Bellows element
4. Push rod
5. Regulating nut
6. Spring housing
6a. Cover
7. Pilot assembly
8. Spindle for pilot cone
9. Teflon sleeves
10. Insulating gasket
10a. Gasket
11. O-ring
12. Valve cover
13. O -ring
14. O -ring
15. Servo piston
16. Bottom screw
17. Drain plug
18. Gasket
19. Strainer assembly,
complete
20. Self-cleaning strainer
assembly
21. Pilot orifice
22. Gasket
23. O -ring
24. Servo spring
WVS 32
WVS 50 – 100
WVS 40
© Danfoss | DCS (az) | 2018.10
WVS 32 – 40 valves have internal BSP
connections, while WVS 50 – 100 can be supplied
with either BSP connections or weld flanges.
Connection to the plant condenser can be made
by copper tube or steel tube, the valves being
supplied with both a flare nipple for 1⁄4 in. (6 mm)
copper tube and a weld nipple
for ø6 mm / ø10 mm steel tube.
The valve consists of three main components:
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 profiled
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
orifice 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 orifice 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 flow.
3. Bellows unit with connection to condenser
The bellows unit is made of aluminium
and corrosion-proofed steel.
DKRCC.PD.DA0.3A.02 | 7
Data sheet | Pressure operated water valve, types WVFX and WVS
Sizing
Offset
When sizing and selecting water regulating valves it
is most important to ensure that the valve at any
time is able to give the necessary quantity of
cooling water.
To select a suitable size of valve it is necessary
to know the precise amount of cooling required.
On the other hand, to avoid the risk of unstable
regulation (hunting) the valve should not be
oversized.
Water Capacity
In general, the aim should be to select the
smallest valve capable of giving the required
flow.
To obtain a precise control it can be
recommended to only use 85% of the capacity.
Below 85% the ratio between flow and
condensing difference pressure is linear. Above
85% the ratio is no longer linear. To reach a 100%
capacity the water valve needs significant
increase of condensing pressure. See fig. below.
Condensing
pressure
Typ e p offset [bar]
WVFX 10 2.0
WVFX 15 2.5
WVFX 20 3.0
WVFX 25 3.5
WVFX 32 – 40 3.0
WVS 32 0.6
WVS 40 0.7
WVS 50 – 80 0.8
WVS 100 0.9
Valve size
The following data is used when selecting
the size of the water valve:
y Cooling capacity of condenser
y Temperature rise in cooling media
y Differential pressure across valve
Sizing Examples Example 1:
Condenser capacity Q0: 30 kW
Condensing temperature t0: 35 °C
Refrigerant: R404A
Cooling media: water
y Condensing temperature
y Specific heat capacity of cooling media
y Refrigerant
Specific heat capacity of water Cp: 4.19 kj/(kg*K)
Water inlet temperature t1: 15 °C
Water outlet temperature t2: 25 °C
Pressure drop across valve p: max. 1.0 bar
© Danfoss | DCS (az) | 2018.10
Necessary mass flow
Volume flow
·
m =
Qc
· 3600 =
30
Cp · (t2 t1) 4.19 · (25 – 15)
·
·
m = 2577
V =
≈ 2.6 m3/h
ρ 1000
· 3600 = 2577 kg/h
DKRCC.PD.DA0.3A.02 | 8
Data sheet | Pressure operated water valve, types WVFX and WVS
Selecting size
[bar]
Standard servo spring type WVS
Special servo spring type WVS
Selecting WVFX 20 Code number
The saturated pressure for R404A
Tc = 35 °C => Pc = 15.5 barg
Choose a WVFX 20 with 4 – 23 barg range
Example 2:
Condenser capacity QC: 20 kW
Condensing temperature tC: 35 °C
Refrigerant: R134a
Cooling media: Brine
Specific heat capacity of water Cp: 4.35 kj/(kg*K)
Water inlet temperature t1: 20 °C
Water outlet temperature t2: 25 °C
Pressure drop across valve p: max. 2.0 bar
Density of brine ρ: 1015 kg/m3
Q
Necessary mass flow
Volume flow
Kv value
·
m =
c
· 3600 =
Cp · (t2 t1) 4.35 · (25 – 20)
·
·
m = 3310
V =
≈ 3.26 m3/h
ρ 1015
·
V
Kv ≥
=
1000 · p 1000 · 2.0
ρ 1015
3.26
20
· 3600 = 3310 kg/h
= 2,32 m3/h
[m3/h]
© Danfoss | DCS (az) | 2018.10
Selecting size of WVFX 20
Kv ≥ 2.32 m3/h => WVFX 20
WVFX 20 has Kv = 3.4 m3/h and the necessary
capacity is below 85% of full capacity
Code number
The saturated pressure for R134a
Tc = 35 °C Pc = 7.9 barg
Choose a WVFX 20 with 3.5 – 16 barg range
DKRCC.PD.DA0.3A.02 | 9
16D03.14 FW
Data sheet | Pressure operated water valve, types WVFX and WVS
Dimensions [mm]
and weights [kg]
WVFX 10 – 25
Danfoss
3N1573.10 FW
Bracket for WVFX 10 – 25
15
22
40
WVFX 32 – 40 WVS 32 – 40
Danfoss
3-193.15 FW
9
56
50
Ø4
Ø7.15
25
62
Danfoss
3N200.11
Danfoss
16D69.14 FW
© Danfoss | DCS (az) | 2018.10
WVS 50 – 100
Danfoss
DKRCC.PD.DA0.3A.02 | 10
Dimensions [mm]
and weights [kg]
(continued)
Pressure operated water valve
Typ e H
1
WVFX 10 91 133 – 72 11 – 55 1.0
WVFX 15 91 133 – 72 14 – 55 1.0
WVFX 20 91 133 – 90 16 – 55 2.0
WVFX 25 96 138 – 95 19 – 55 2.0
WVS 32 42 243 234 138 20 85 – 4.0
WVS 40 72 271 262 19 8 30 100 – 7.0
WVS 50 78 277 268 315 218 – 165 19.0
WVS 65 82 293 284 320 224 – 185 24.0
WVS 80 90 325 316 370 265 – 200 34.0
WVS 100 100 345 336 430 315 – 220 44.0
H
2
H
3
L L
1
B ø
weight
Pressure operated water valve, type WVS - high pressure refrigerants
Typ e H
1
WVS 32 42 259 250 138 20 85 – 4.0
WVS 40 72 287 278 19 8 30 10 0 – 7. 0
WVS 50 78 293 2684 315 218 – 165 19.0
WVS 65 82 309 300 320 224 – 185 24.0
WVS 80 90 341 332 370 265 – 200 34.0
WVS 100 100 361 352 430 315 – 220 44.0
H
2
H
3
L L
1
B ø
weight
Net
Net
© Danfoss | DCS (az) | 2018.10
DKRCC.PD.DA0.3A.02 | 11
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