Butterfly valve

Details Butterfly valve Butterfly valve

F - Mech Eng,Light,Heat,Weapons

16

K

251/29

F16K 1/226 (2006.01)

Patent

CA 1187857

ABSTRACT BUTTERFLY VALVE A fire-safe butterfly valve (Figure 2) provides bi-directional sealing. In normal duties a polymeric seal (26) provides forward and reverse sealing against the edge (4) of the valve disc (1), the polymeric seal (26) being resiliently loaded in the axial direction of the valve by a resilient metal ring (5). The metal ring (5) provides a bi-directional seal with the disc edge in the event of destruction of the polymeric seal by fire. The metal ring (5) in trans- verse cross-section consists of an arm (19) having a curved radially inner end (6) presenting a convex surface (21) for engagement with the disc edge. For fluid pressure acting from the smaller diameter side of the disc, in the burnt out condition, the curvature of the radially inner end (6) of the metal ring gives rise to an increased sealing force with the disc edge as the disc moves in response to the fluid pressure and the ring inner end remains in rolling contact with the disc edge.

411246

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