Fire tested butterfly valve

Details Fire tested butterfly valve Fire tested butterfly valve

1978-01-04

1980-05-13

Cohen, Irwin C.

Fluid handling

Destructible or deformable element controlled

Heat destructible or fusible

251173, 251306, F16K 506

Patent

active

042023653

ABSTRACT:
Disclosed is a fire-tested butterfly valve having an annular resilient seat member and an annular, flexible metal seat member, both held in place in a valve housing by being clamped between cooperating surfaces of the valve housing and a valve seat retaining ring insert. In a first embodiment, a fusible washer with a lower destruction temperature than that of the annular resilient seat is positioned between the resilient seat and the metal seat. In a second embodiment, an integrally formed protrusion on the annular resilient seat contacts the metal seat. In both embodiments, the metal seat is held out of contact with the butterfly disc until exposure to a fire melts the fusible washer or the seat protrusion, at which time the metal seat comes into contact with the disc to establish a secondary, metal-to-metal, fire resistant seal.

REFERENCES:
patent: 3346234 (1967-10-01), Allen
patent: 3480253 (1969-11-01), Priese et al.
patent: 3608861 (1971-09-01), Helman et al.
patent: 4105040 (1978-08-01), Chester

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