Guardian II Metal Bellows Seal

The Flowserve Guardian II Metal Bellows Seal control valve eliminates valve leakage using a formed metal bellows design with minimal welded joints.

The Guardian II provides a full-cycle life of up to 5 million cycles, ensuring years of safe and reliable operation in hazardous processes, withstanding temperatures ranging from -320°C to 538°C.

The valve features a metal shroud that acts as a pressure boundary, allowing the use of a single, pressurized gasket seal and preventing fluid contact with the bellows housing during normal operation.

It can be retrofitted to a standard Mark One valve by changing the plug and bolting, adding a bellows assembly, bellows housing, and lower guide assembly.