G100 High Lift Safety Relief Valves

G100 High Lift Safety Relief Valves G100 High Lift Safety Relief Valves

G100 Bronze high lift safety relief valves.

Bronze high lift safety valves - side outlet discharge with test lever. These valves are for use with compressible media; mainly steam systems to prevent safe pressures being exceeded.

Size Range:
  • DN15 to DN50 (1/2” to 2”)
Pressure Range:
  • 0.3 Bar.g (4 psi) to 20.7 Bar.g (300 psi)
Pipe Connections:
  • Female x female.
  • Inlet: Threaded ‘G’ BSP Male to BS EN ISO 228/BS 2779.
  • Outlet: Threaded ‘Rp’ Parallel Female to BS 21/BS EN 10226/ISO 7.
  • Alternative thread standards, i.e. taper or NPT are available upon request.
  • Flanged connections also available. Most flange standards can be accommodated.
Features and Benefits:
  • Gresswell Valves are quality assurance approved to BS EN ISO 9001: 2015 and manufactured in accordance with BS EN ISO 4126-1 & BS6759.
  • Full Cat IV PED approval.
  • The G100 range of valves are ideal for handling compressible material but it must be noted... they are not suitable for liquids.
  • Clear operating and maintenance instructions are supplied with each despatch.
  • See data sheets for Discharge Capacities.

All Gresswell Relief Valves are given a hydraulic seat tightness test before leaving the factory and all valves are supplied pre-set. Special tests or witness testing can be arranged at extra cost.

Flow Substance:




Steam boiler, pipeline and vessel protection.

Compressor, pipeline and reciever protection.


Gresswell Valves G100 Datasheet G100 Datasheet

Gresswell Valves G100 Discharge Capacities G100 Discharge Capacities