Fluid handling – Destructible or deformable element controlled – Heat destructible or fusible
Patent
1992-05-08
1993-05-25
Rivell, John
Fluid handling
Destructible or deformable element controlled
Heat destructible or fusible
137 681, 137 79, F16K 1714, F16K 1740
Patent
active
052131289
ABSTRACT:
A pressure relief valve, which can be pressure activated or thermally activated, includes a valve housing with an inlet communicating with an interior of a pressure vessel, and a passage from the inlet, through the housing, to an outlet for communicating with the exterior of the housing. A seal plug has a passageway which communicates between an inlet side of the passage and an outlet side of the passage. The seal plug is disposed within a cavity of the housing and across the passage. The seal plug retains a frangible disk against a radial shoulder of the passage for sealing the passage. Excessive pressures within the pressure vessel cause the frangible disk to rupture, thereby exposing a flow path between the inlet and the outlet through which the gas can escape. A thermal trigger engages the seal plug within the cavity to restrict movement of the seal plug and maintain a seal of the passage when a temperature adjacent to the housing is below a predetermined temperature threshold. The thermal trigger releases the seal plug, which is movable within the cavity, allowing the seal plug to relocate within the cavity when the temperature reaches the predetermined temperature threshold, thereby exposing a flow path between the inlet and outlet through which gas can escape.
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