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Buckling Pin technology offers an accurate and reliable means of calibrating pressure relief devices. BS&B has developed the BPRV™ Buckling Pin Relief Valve for in-line pressure or vacuum relief offering quick and simple external resetting.
Buckling Pin Relief Valves (BPRV’s) provide in-line pressure, or vacuum relief with the advantage of a quick and simple field reset, without removal from the piping system.

The BPRV can be reset in minutes without breaking the flanges, making it ideal for applications where reduced downtime is desired, all while limiting operator exposure and the environment to the process fluid.

The BPRV is a non-reclosing device, certified for ASME VIII gas or liquid applications.

BS&B Buckling Pin Relief Valve


Set Pressure Range
Buckling pin technology is used for overpressure or vacuum relief at set pressures from a few inches of water column to over 1000psig.
Size Range
Valves are available for installation between all international standard flanges.
Because the buckling pin mechanism is located in an external enclosure, the set pressure is unaffected by process temperature; only the ambient atmospheric temperature needs to be considered.
Operating Ratio
A 90% operating ratio permits process pressures up to 90% of the set pressure.
Valves can be supplied to withstand vacuum. Inverted styles of the BPRV may be used for vacuum relief.
Pressure Cycling
Accuracy and reliability are maintained under pressure cycling conditions.
Leak Tight
As the operating pressure increases, the seal is progressively energized to maintain leak tightness. The seal is bubble-tight and offers minimal resistance to opening, permitting low set pressures and tight pressure tolerances.


  • Simple in-line installation
  • Maximum relief capacity
  • Convenient external reset
  • Set pressure is unaffected by cycling/pulsating pressures
  • Standard set pressures up to 275 psi
  • Set pressure is unaffected by valve orientation
  • The buckling pin is totally protected with a rugged enclosure


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