Butterfly valve

Details Butterfly valve Butterfly valve

1976-03-24

1977-05-24

Cline, William R.

Valves and valve actuation

Rotary valves

Butterfly

251368, F16K 122

Patent

active

040250504

ABSTRACT:
A butterfly valve comprises a valve body, a valve seat, a valve stem, a valve member and sealing assemblies. The valve seat has three layers such as a first, a second and a third layers which are formed from hard synthetic resin, resilient material and fluororesin respectively. An effective seal can be achieved by providing an inwardly convex contour on the inner peripheral surface of the valve seat.

REFERENCES:
patent: 3346005 (1967-10-01), Hanssen
patent: 3778028 (1973-12-01), Graves et al.
patent: 3782684 (1974-01-01), Stephens
patent: 3784157 (1974-01-01), Wenglar
patent: 3837620 (1974-09-01), Malloy et al.

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