BIRKETT WB100 Bellows Liquid Type Cryogenic Safety Relief Valve

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BIRKETT WB100 Bellows Liquid Type Cryogenic Safety Relief Valve

A full lift, full nozzle, balanced bellows valve with dimensions to API526, the WB100 is designed to safely relieve excess pressure in pumps, pipework, tanks, calorifiers, gas and oil separators and other process vessels. It is suitable for liquid applications. All design options and the various effects of system conditions and back pressure have been verified on Birkett’s extensive in-house mass flow test facility. Continuous design improvements have created smaller and lighter valves to support current industry design trends, especially space and weight savings. Valves can be modified from type to type simply by changing only a few parts, and precise engineering has reduced the number of parts, making maintenance easier and more cost effective.

BIRKETT WB100 Bellows Liquid Type Cryogenic Safety Relief Valve
The WB100 Bellows valves are statically balanced and can be used on more complex discharge systems such as common discharge manifolds and flares where several valves may discharge. This type of system creates a variable superimposed back pressure. The balanced bellows unit cancels out the effects of variable back pressure, on the set pressure of the safety relief valve.

Valves operating on liquid service require a modified valve design to cope with the differing dynamics of liquid flow. A contoured plug disc is used to minimise initial flow rate, eliminating any potential inlet pressure drops due to excessive valve lift. The valve will simmer until sufficient pressure is available to generate lift: once this has occurred, the lift will stabilise to suit the flow and pressure conditions required, thus avoiding the problem of chatter. ‘Chatter’ is the rapid opening and closing of the valve which can have a damaging effect on the disc and nozzle, causing it to leak.

A selection of accessories is available to suit system requirements. These include: