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UPVC Back Pressure Valve / Safety Relief Valve

A spring-loaded diaphragm safety/back pressure valve for metering pump discharge lines, providing overpressure protection and stable dosing accuracy.

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UPVC Back Pressure Valve / Safety Relief Valve
The diaphragm and valve core are pressed against the valve seat by an internal spring. When system pressure exceeds the preset value, the diaphragm and valve core lift, releasing media to the return line or container. The back pressure valve is installed on the positive-pressure discharge line of a metering or diaphragm pump, preventing siphonage and eliminating dosing variations caused by pressure fluctuations, thereby ensuring dosing accuracy.

Performance Parameters

Caliber
DN15~DN65
Material
UPVC, PP, CPVC, PVDF, SUS304, SUS316L
Working pressure (safety valve)
0~1.0MPa
Working pressure (back pressure valve)
0.2~1.6MPa

Common Materials

  • UPVC
  • PP
  • CPVC
  • PVDF
  • SUS304
  • SUS316L (body)
  • PTFE + rubber composite (diaphragm)
  • • Internal spring presses diaphragm and valve core against the seat
  • • Automatically lifts to relieve overpressure, returning media to the container
  • • Field-adjustable via screw; safety valve range 0~1.0MPa
  • • Back pressure valve prevents siphonage and stabilizes dosing accuracy
  • • Back pressure adjustable within 0~0.6MPa
  • Overpressure protection for metering/diaphragm pump discharge lines
  • Back-pressure stabilization for metering/diaphragm pump piping

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