Parallel expanding gate valve

Details Parallel expanding gate valve Parallel expanding gate valve

1991-02-22

1992-10-27

Fox, John C.

Valves and valve actuation

With means to increase head and seat contact pressure

Gate valve

251193, F16K 318

Patent

active

051582643

ABSTRACT:
Apparatus and methods for sealing a parallel expanding gate valve are provided using upper and lower wedges separate from and located between the gate segments. The gate segments are symmetrical with respect to each other and have inner upper and lower tapered surfaces. Inclined surfaces on the upper wedge press the inner upper tapered surfaces of the gate segments. The inner lower tapered surfaces of the gate segments also press against inclined wedging surfaces on the lower wedge. This wedging action forces the gate segments outward with respect to each other and with substantial force against sealing assemblies to close and seal the gate valve.

REFERENCES:
patent: 1624465 (1927-04-01), Black
patent: 2039465 (1936-05-01), Vetrano
patent: 2103536 (1937-12-01), Inge
patent: 2282553 (1942-05-01), Banowetz
patent: 2654563 (1953-10-01), Mueller et al.
patent: 2793831 (1957-05-01), Doster
patent: 3039734 (1962-06-01), Blevans
patent: 3125323 (1964-03-01), Heinen
patent: 3434692 (1969-03-01), Tillman, III
patent: 4471943 (1984-09-01), Nelson
patent: 4625942 (1986-12-01), Nelson
W-K-M Division (acf) "W-K-M Pow-R-Seal API Gate Valves", pp. 7349-7350 and 73.

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