Type P800 Direct Operating Factory Preset Relief Valve

The inline BelGAS Type P800 direct operating factory preset relief valve is designed for use in pneumatic applications that warrant protection from overpressurization. The Type P800 is used primarily between a pneumatic instrument and a supply regulator to limit the instrument supply pressure to 50 PSIG in the case of a supply regulator failure.



  • Non-rising Adjustment Assembly
  • Large 0.344 Relief Seat Diameter
  • Large Diaphragm Area


  • Instrument air supply
  • Rolling diaphragm for enhanced accuracy
  • Tamper resistant spring case