Temperature responsive valve seal

Details Temperature responsive valve seal Temperature responsive valve seal

1977-06-27

1978-08-08

Schwadron, Martin P.

Fluid handling

Destructible or deformable element controlled

Heat destructible or fusible

251174, 251306, 277 26, F16K 506

Patent

active

041050401

ABSTRACT:
A butterfly valve with a conventional resilient seal of rubber or plastic or the like is provided with a secondary seal of a hard, fire resistant material such as metal. The secondary seal is in the form of a split ring which is held in an expanded condition with a fusible link which will melt at some selected temperature such that the secondary seal is normally out of contact with the sealing surface of the butterfly. At the selected temperature, the fusible link melts permitting the secondary seal to contract into a sealing position to replace the resilient seal prior to or coincident with the destruction of the resilient seal by the high temperature.

REFERENCES:
patent: 2983478 (1961-05-01), Masheder
patent: 3346234 (1967-10-01), Allen
patent: 3986699 (1976-10-01), Wucik et al.
patent: 3990465 (1976-11-01), Allen

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