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Thermostatic valve Type WVTS

Thermostatic valve type WVTS is suitable for controlling the temperature of a flow of water or neutral brine.
WVTS opens on rising sensor temperature and is indirect servo operated thermostatic valve. It is suitable for controlling temperature in industrial applications by regulating the quantity of cooling water or neutral brine that
cools down the process. The valves are self-acting, i.e. they operate without the supply of auxiliary energy such as
electricity or compressed air. The required temperature is maintained constant without unnecessary use of cooling
water in cooling systems. The operating economy and-efficiency are maximized.


Insensitive to dirt
Insensitive to water pulsating pressure
Proven reliable through decades
Easy to service
Built-in pilot filter
Long lifetime
High performance
Very high capacity
Both welding and thread connection flanges



Technical data
Type WVTS for neutral media
Operation Servo-operated
Sensor side
Temperature range 0 – 30 °C 25 – 65 °C 50 – 90 °C
Max. sensor temperature 57 °C 90 °C 125 ° C
Liquid side
Media Fresh water, neutral brine
Media temperature range – 25 – 90 °C
Permissible working pressure PB 10 bar
Max. test pressure 16 bar
Opening differential pressure WVTS 32 – 40: min. 0.5 bar; max. 4 bar
WVTS 50 – 100: min. 0.3 bar; max. 4 bar

Valves are supplied with capillary tube gland. Different lengths of capillary tube are available. If WVTS is required with an opening differential pressure of 1 – 10 bar, the valve servo spring must be replaced. See “Ordering”.



WVTS components
Valve type Connection kv value2 [m3/h] Code no. Valve housing Code no. Flange set 3) Code no. Special servo spring for differential pressure range 1 – 10 bar
WVTS 32 G 1 1/4 12. 5 016D5032 016D1327
WVTS 40 G 1 1/2 21.0 016D5040 016D0575
WVTS 50 2 in.weld fl. 32.0 016D5050 027N3050 016D0576
WVTS 65 2 1/2 in. weld fl. 45.0 016D5065 027N3065 016D0577
WVTS 80 3 in. weld fl. 80.0 016D5080 027N3080 016D0578
WVTS 100 4 in. weld fl. 125. 0 016D5100 4) 027N3100 016D0579

WVTS_valves_00031) ISO 228-1.
2) The kv value is the flow quantity of water in [m/h] with a pressure drop across the valve of 1 bar, p =1000 kg/m³. 3
3) Code nos. include 2 flanges.
4) Code nos. include valve housing, flange gakets, flange bolts and screws for pilot valve.


WVTS, thermostatic pilot element 1)
Range [o C] Capillary tube length [m] Code no.
0 – 30 2 016D1002
25 – 65 2 016D1003
50 – 90 2 016D1004
0 – 30 5 016D1005
25 – 65 5 016D1006
50 – 90 5 016D1007

The pilot element includes control element and spring housing.

Description Code no.
Immersion sensor (sensor pocket) 003N0050
Capillary tube gland 1) 003N0155

1 capillary tube gland supplied as standard accessory

Material – parts in contact with the medium


3.Bellows element
4.Pressure rod
5.Regulating nut
6.Setting element housing
7. Pilot orifice assembly
8. Pilot cone
10.Insulating washer
12.Valve cover
15.Servo piston
20.Filter cartridge (self-cleaning)
21.Equalising orifice
24.Servo spring

The valve body is made of cast iron with pressed-in bronze seat. The pilot orifice assembly (7) consists of a
housing with seat and pilot cone of stainless steel. A filter cartridge (20) is built into the valve cover. Here the equalising orifice is protected by a replaceable filter. The bellows in the bellows element (3) are of tin bronze. In designing WVTS, great emphasis was placed on producing a valve with a completely tight seat and no external
leakage. The servo piston was therefore fitted with a ring of special rubber that creates an elastic seal against the valve seat.

A specially designed rubber sleeve ensures that the servo piston moves in the cylinder with minimum friction.
External valve leakage is prevented at the pilot cone where the spindle is fitted with Teflon cup washers. Cover gaskets and pilot channel seals are rubber. The water-tight rubber seal between cover (6a) and housing (6) ensure that moisture cannot enter and freeze up the spindle. The insulating washer (10) prevents heat transmission between valve body and setting element housing.





The capacity curves show the capacity (water quantity in m³/h) of the individual valve sizes as a function of pressure drop across the valve. The capacities are given for approx. 85% valve opening and are obtained with an offset of 4 °C (temperature rise at sensor) on both upper and lower temperature ranges.

Dimensions [mm] and weights [kg]



Type H1 H2 H3 L L1 B øD øD1 weight Net
WVTS 32 42 196 210 138 20 85 18 4
WVTS 40 72 224 210 198 30 100 18 7
WVTS 50 78 230 210 315 218 165 18 19
WVTS 65 82 246 210 320 224 185 18 24
WVTS 80 90 278 210 370 265 200 18 34
WVTS 100 100 298 210 430 315 220 18 44