™Catalog 77-1015 Buckling Pin Pressure Relief Technology The Buckling Pin Relief Valve (BPRV™) offers quick and simple field reset without removal from the piping system. BS&B SAFETY SYSTEMS, L.L.C. BS&B SAFETY SYSTEMS LTD. U.S. Patent Number 6,367,498 applies; other international patents pending.

Design (U.S. Patent #6,367,498 applies; Worldwide Patents Pending) The 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 collapse at a load coincident with that resulting from the shaft torque at a predetermined differential pressure, the BPRV provides accurate pressure relief. Buckling Pin technology...

Three Set Pressure Calibration Controls 1-The Offset of the BPRV Disc Shaft from the Center Line. A large offset will generate a higher shaft load; a small offset will generate a lower shaft load. For BPRV devices supplied for applications within the ANSI 150/DIN PN10 flange pressure range, a standard offset is used that does not exceed 1"/25mm, even for the largest installation. 2-The Buckling Strength of the Buckling Pin. This is a function of the 4th power of the pin diameter, the Modulus of Elasticity of the Pin material, and the inverse of the Pin length. Buckling Pin diameter is used for...

Installation The BPRV is designed for “in-line” installation between pipe flanges. Each device is a 'full face' design with the pipe flange bolting typically passing through the perimeter of the body. Some flange specifications have a compact bolting pattern that would interfere with the bushings or bearings if through bolt holes were used; in these cases, a threaded blind bolt hole is provided on both sides of the BPRV so a full set of flange bolts is installed. The piping may run horizontally, vertically, or at an oblique angle. The BPRV can be supplied set-pressure certified for any of these...

Enclosure and Mechanism Construction Three standard mechanisms are employed to met the torque requirements of the BPRV nominal sizes 1”- 60” (25 mm-150 mm). In all cases, the mechanism is fitted to a solid stainless steel baseplate to ensure rigidity. The mechanism is either installed inside a stainless steel enclosure or has an enclosure bolted to the baseplate (see M4200 photo). The M16000 mechanism handles low torque applications typical of BPRV sizes 1”-6” (25 mm-150 mm). The more substantial M4200 mechanism handles the torque range typical for higher pressure 4” (100 mm) BPRV devices through...

Codes and Standards Several International standards recognize Buckling Pin devices and provide guidelines for their certification. These include ASME, in the form of code case 2091, and TUV AD Merkblatt A1 and the European Pressure Equipment Directive (PED). The BPRV can be supplied to all established standards. Maintenance If desired, the Buckling Pin can be removed and the BPRV tested by rotating the disc into the open position triggering the mechanism. There must be no pressure on the device. The Buckling Pin can then be reinstalled. Occasionally it will be necessary to replace the disc seal....

Optional SAF-T-PIN™ Buckling Pin Cartridge The BPRV can be provided with Buckling Pin Cartridges that are installed like an electrical fuse. The SAF-T-PIN™ Buckling Pin Cartridge allows a "Quick-Change" option of Buckling Pins with a simple push-in/pull-out design for installation within the enclosure. Each SAF-T-PIN™ Cartridge contains a calibrated Buckling Pin that is perfectly mounted for optimum performance. The SAF-T-PIN cartridge locates into the BPRV mechanism in one direction only ensuring fail-safe installation. The transparent cartridge permits visual inspection of the Buckling Pin,...

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