Valves and valve actuation – Reciprocating valve – Gate
Patent
1993-10-15
1994-12-06
Fox, John C.
Valves and valve actuation
Reciprocating valve
Gate
251368, F16K 100
Patent
active
053703626
ABSTRACT:
An improved gate for a gate valve will allow shearing of a wireline extending through the gate valve while preserving post-shear seal integrity. The improved gate comprises an inlay of a hard ductile material such as Stellite along the shearing edge of the gate. The gate also comprises a coating of an extremely hard material such as tungsten carbide on the sealing surface of the gate. The invention also covers an improved gate seat. The improved seat also comprises an inlay of a hard ductile material such as Stellite along its shearing edge. The improved seat can also have a coating of an extremely hard material such as tungsten carbide on part of its sealing surface.
REFERENCES:
patent: 4356838 (1982-11-01), Morello
patent: 4458879 (1984-07-01), Jandrasi
patent: 4911410 (1990-03-01), Baker
patent: 4997162 (1991-03-01), Baker et al.
Dach Anton J.
Deocampo Hernani G.
Kent Peter M.
Williams Ted D.
ABB Vetco Gray Inc.
Bradley James E.
Fox John C.
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