Fluid handling – Destructible or deformable element controlled – Heat destructible or fusible
Patent
1978-11-08
1981-06-09
Schwadron, Martin P.
Fluid handling
Destructible or deformable element controlled
Heat destructible or fusible
251306, F16K 1700
Patent
active
042718589
ABSTRACT:
In a butterfly valve, comprising a valve disk which is pivotally mounted in a valve housing for movement between a closed position, in which it prevents the flow of fluid along a passageway defined by the housing, and an open position in which the flow of fluid is allowed, an annular seal is provided to seal between the periphery of the disk and the wall of the passageway when the disk is in its closed position. The seal comprises two deformable sealing members of P.C.T.F.E. with a rigid fireproof ring independently mounted between the sealing elements. The disk is located for pivotal movement by locating means constituted by fire-destructible members of a similar material to that of the sealing elements, so that in the event of a fire that destroys the sealing elements the disk becomes free to move a small distance along the passageway into engagement with the fireproof ring to effect a seal. The disk is mounted on two axially aligned shafts which are keyed together to allow radial relative movement therebetween, but normally prevented from such movement by the locating means. A first of the two shafts, to which the valve disk is secured, is radially located for rotation in a blind bore in the housing by a fire-destructible bearing sleeve. The second shaft is rotatably mounted in the housing and extends from the housing for actuation of the valve. In the event of a fire, the fire-destructible collar and sleeve would be destroyed, leaving the disk free to move, with the first shaft, radially of the second shaft into sealing engagement with the fireproof ring.
REFERENCES:
patent: 3174495 (1965-03-01), Anderson et al.
patent: 3591133 (1971-07-01), Miles et al.
patent: 3815869 (1974-06-01), Smith et al.
Burton Philip J.
Snape Christopher J.
Charles Winn (Valves) Limited
Schwadron Martin P.
Spiegel H. Jay
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