Buckling Pin Pressure Vent The Buckling Pin Relief Vent (BPRV) is reset without removal from the process stream BS&B Safety Systems, Inc.kling Pin Relief Vent (BPRV) is reset without removal from the process stream. It is designed so that the vent can be reclosed and the pressure-calibrated pin can be replaced without opening flanges and pipelines. The resetable pin mechanism is protected in an enclosure outside the process and remains unaffected by process temperature or cyclic pressures.
Suitable for liquid or gas service, the BPRV has a leak-tight plug mounted on an offset, rotating shaft connected to the external pin mechanism. Excess pressure acting on the asymmetrically loaded plug collapses the buckling pin when the set pressure is achieved. The plug shaft then rotates to open the vent completely and to relieve pressure. The pin mechanism latches the vent open to maximize flow and to prevent recoil. Once the overpressure or vacuum condition is corrected, the BP