Safety devices for protecting refrigeration systems from excess pressure

RVD Constant Pressure Valves

GEA constant pressure valves are autonomously working regulating devices (constant pressure function) within the oil management systems of screw compressor packages, to ensure defined minimum differential pressure (e. g. 3 bar, 4 bar etc.) or oil injection pressure during the start-up phase and running of the screw compressor. The constant pressure valve is equipped with a back-pressure compensation sealing element. The valve is opened by the pressure of the operating medium below the valve disc and depends on the set opening pressure of the valve (spring-loaded). The set pressure is determined by the customer and is set by the manufacturer

Technical Features

  • Available in 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 and blends with refrigerator oil; neutral, gaseous and liquid mediums; glycol-based cold brine
  • Installation position: in any position
RVD Pressurizers
materialsteel or stainless steel
nominal sizeDN 40-150
nominal pressure levelPS 25, PS 40
temperature range-60 °C to +150 °C
temperature range for
HT Valve Series
-10 °C to +200 °C
connectionbutt welding and flanged ends as per DIN and ANSI
set pressure range1-9 bar
GEA AWP RVD Pressurizer

Pressure Valve type RVD

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