Fire tested butterfly valve

Details Fire tested butterfly valve Fire tested butterfly valve

F - Mech Eng,Light,Heat,Weapons

16

K

251/30

F16K 5/00 (2006.01)

Patent

CA 1113077

ABSTRACT OF THE DISCLOSURE Disclosed is a fire-tested butterfly valve having an annular resilient seat member an and 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 in- tegrally 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.

342769

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