Fire safe butterfly valve

Details Fire safe butterfly valve Fire safe butterfly valve

1978-01-04

1980-10-21

Cohan, Alan

Fluid handling

Destructible or deformable element controlled

Heat destructible or fusible

251173, 251174, F16K 506, F16K 1740

Patent

active

042288169

ABSTRACT:
Disclosed is a fire-tested butterfly valve having a resilient flexible seat member held in place in a valve housing by being clamped between cooperating surfaces of the valve housing and a valve seat retaining ring insert. Also positioned between the housing and the insert is a fusible washer means which has a lower destruction temperature than that of the annular flexible seat. Further, the insert is spring biased toward the fusible washer and valve housing so that when the valve is exposed to fire the fusible washer melts, the insert is biased toward the housing, and as the annular flexible seat is destroyed by heat, an edge of the insert into contact with the butterfly 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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