The BPRV Buckling pin relief valve from BS&B Pressure Safety Management can be certified according to the 2009 addendum of ASME Section VIII, Division 1, bearing both the UD (American Society of Mechanical Engineers) stamp and NB (National Board of Boiler and Pressure Vessel Inspectors) marks.

The latest addendum to ASME Section VIII, Division 1 welcomes "pin actuated devices" to full Code status following completion of Code committee formalities for this pressure-relief technology. This is an important step for those jurisdictions and users whose safety rules require that pressure relief devices shall be ASME Code Certified. The patented design of the BPRV is based upon the offset shaft butterfly valve concept.

The offset of the shaft results in a turning moment being generated about the valve shaft when a pressure differential is applied across the device. A Buckling Pin mounted externally to the process normally resists this turning moment. By calibrating the Buckling Pin to activate at a load coincident with the shaft torque generated at a predetermined differential set pressure, the BPRV provides accurate pressure relief. Standard set pressures range from one PSIG to 275psig, with sizes up to 60in nominal pipe size. Special requirements to over 2000psig can be achieved.