Instrumentation & Electrical : Safety Relief Valve

BIRKETT Safety Relief Valve designed to prevent internal fluid pressure from rising above predetermined maximum pressure in a pressure vessel exposed to emergency or abnormal conditions.

Product Type

WB Series
Full lift, full nozzle, conventional or balanced bellows valves.

Gas or liquid thermal relief valves.

Pilot operated safety valves with a unique full nozzle design and dimensions to API 526. Pop and modulating pilots are available for both liquid and gas duties.


Screwed : 15mm (0.5in) to 40mm (1.5in), API/NPT or BSP threads.
Flanged : 15mm (0.5in) to 200mm (8in), ANSI 150# RF or RTJ.

Up to 425.5 barg (6170 psig)

-286°C (-425°F) to 538°C (1.000°F)

Materials availability
  • Carbon Steels
  • Low Temp Alloy
  • High Temp Alloy
  • Stainless Steels
  • Aluminium Bronze
  • Lined
  • Incolloy
  • Titanium
  • Hastelloy
  • Duplex
  • 6MO
  • Monel
  • Alloy 20
  • Inconel
  • Zirconium
  • Others Exotics