Method of forming a thermally activated pressure relief valve

Details Method of forming a thermally activated pressure relief valve Method of forming a thermally activated pressure relief valve

1987-04-29

1989-01-31

Echols, P. W.

Metal founding

Process

Shaping liquid metal against a forming surface

164114, 291571R, 137 74, B22D 2715

Patent

active

048009482

ABSTRACT:
A method is disclosed for forming a thermally activated pressure relief valve which is designed to be attached to a pressure vessel. The valve contains a body having an inlet and an outlet in fluid communication with each other and an insert having a helical groove formed about its outer periphery. The method includes securing the insert in the outlet such that the helical groove cooperates with the body to form a helical passageway. A molten fusible material is then introduced into one end of the helical passageway. A force is exerted on the material to cause it to move through the helical passageway and displace any trapped air, gas or foreign matter which might be present therein. Once the material completely fills the passageway, it is allowed to cool and solidify. This method is advantageous in producing a safety relief valve which can operate at higher service pressures and temperatures over an extended period of time.

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