Piston-type thermally activated relief device

Details Piston-type thermally activated relief device Piston-type thermally activated relief device

1995-01-17

1996-04-30

Fox, John C.

Fluid handling

Destructible or deformable element controlled

Heat destructible or fusible

137 79, F16K 1738

Patent

active

055115764

ABSTRACT:
A thermally activated relief device which resists extrusion-related failures even at high pressures and yet reliably activates to relieve pressure in a vessel and to prevent a catastrophic pressure rupture of a vessel is provided. The thermally activated relief device includes a body having an inlet, an outlet, and a fluid flow passage communicating with the inlet and outlet. The body further includes a fluid escape passage having a member therein which is porous to gases and liquids but not to solids. A plug of a fusible material which melts at a predetermined temperature is positioned adjacent to the porous member and normally seals the fluid escape passage. A piston is normally biased into a sealing relationship with the inlet, but, when the fusible plug melts, moves upwardly to open the flow passage and relieve fluid pressure.

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