WVR-SVU Dual Safety Valves

Dual safety overflow valves, consisting of one 3-way valve and two safety valves, independent of back pressure.

AWP dual safety overflow valves are designed for installation in the refrigerant cycles of industrial refrigeration systems. The safety valves which are independent of back pressure protect refrigeration systems and their components from excess pressure (see also EN 378 part 2). They comply with the technical regulations of the German Technical Control Board (TÜV) and with AD2000 regulations. Once the set response pressure is reached AWP safety valves begin to open. They open within a 10 % pressure increase until the designed limit of the lift is reached. When the pressure drops again they start closing once the set response pressure is reached. They close completely within a pressure drop of 10 % below the set reponse pressure.The 3-way valve enables easy checks and maintenances of the safety valves without the system’s operation to be interrupted. One of the two outlet nozzles is always open whereas the other one is closed. So one safety valve can be inspected or even disassembled while the other one is protecting the system.

  • Available in steel or stainless steel
  • Selection of body material as per German DIN EN12284, AD2000 Series W
  • Working mediums: refrigerants as per EN 378 p. 1, e.g. NH3, R134a, R290 (propane), R507; blends with refrigerator oil; neutral, gaseous and liquid mediums; glycol-based cold brine
  • Installation position: vertical as per AD2000-leaflet A2 and horizontal
  • Available valve seat seals (for safety valves):
    WVR-SVUA: PTFE seal, can be used at temperatures of -60 °C to +180 °C, cannot be used for response pressures of less than 10 bar.
    WVR-SVUB: elastomer seal, can be used at temperatures of -50 °C to +110 °C

WVR-SVU Dual Safety Relief Valves

steel or stainless steel
Nominal Size (Inlet/Outlet)
DN 15/15 – 65/100
Nominal Pressure Level
PS 25, PS 40, PS 63

Temperature Range for Standard Valves

WVR-SVUA: -60 °C to +180 °C

WVR-SVUB: -50 °C to +110 °C

flanged ends as per DIN and ANSI threaded ends
Response Pressure (for Safety Valves)
4 – 63 bar
Additional Information

available with bursting discs,

bursting disc holder and

excess flow valve

Get in touch

Armaturenstr. 2
17291 Prenzlau

Phone: +49 3984 8559-0
Fax: +49 3984 8559-18