RVA check valves have a lifting stem - can closed permanently

RVA Stop Check Valves

GEA check valves open autonomously by the pressure that is exerted by the working medium upon the valve disc. They start to open at a differential pressure of 0.01 to 0.05 bar and are fully open between 0.1 and 0.2 bar. As soon as the flow is interrupted or the flow direction is reversed, the valve closes automatically. Additionally, RVA stop check valves may also be closed manually with a handwheel or a ratchet attached to the lifting stem. Rotating the stem clockwise will keep the valve disc down on the valve seat and therefore keeps the valve closed, counter-clockwise rotation will enable the valve disc to be opened by the pressure of the medium. The built-in damping device makes this type of valve especially suitable in cases where the power requirement / flow rate fluctuates. GEA stop check valves are designed for installation in industrial heating and refrigeration systems. They are installed on either the pressure or suction side of compressors or in pipes in which only one direction of flow is intended. The stem sealing is provided by a threaded bush with spring-elastic PTFE ring.

GEA AWP RVA Stop Check Valve

Stop Check Valve type RVA

Technical features

  • Available in steel or stainless steel
  • Selection of body material as per German DIN EN12284, AD2000 Series W
  • Working mediums: refrigerant as per EN 378 p. 1, e. g. NH3, R22, R134a and blends with refrigerator oil; neutral, gaseous and liquid mediums; glycol-based cold brine
  • Installation is possible in horizontal and vertical position for upward flow direction
  • Optionally available without damping
RVA stop check valves
materialsteel or stainless steel
nominal sizeDN 10-250
nominal pressure levelPS 25, PS 40, PS 63
temperature range for standard valves-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
brazed ends
threaded ends
additional informationavailable with cover extension and linear ball bearing

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