Valves and valve actuation – Reciprocating valve – Gate
Patent
1991-03-05
1992-12-08
Fox, John C.
Valves and valve actuation
Reciprocating valve
Gate
251 84, 251175, F16K 318
Patent
active
051691256
ABSTRACT:
A gate valve provides an efficient and effective seal from high pressures to pressure differentials below 50 psi through a self-aligning gate of reduced mass (semi-gate). The invention provides a transmission between the gate and stem which permits its sealing surface to remain normal to the relative surface of the seat irrespective of pressure, circulation rate, or flow medium (gas or liquid). This is accomplished through the full floating nut element which, when loosely engaged to the stem and inserted into an oversized slot at the upper end of the semi-gate, allows the gate to move axially in the direction of flow without interfering with the vertical movement of the gate by the stem. This feature is accomplished by introducing a clearance between the stem and nut. The gate is of reduced mass to allow a more instantaneous response to pressure transients because of its lighter weight and reduced profile. By eliminating substantially the lower 50 percent of the gate's flow port, a large reduction of gate mass is achieved, allowing further mass and size reductions to the gate housing.
REFERENCES:
patent: 2192331 (1940-03-01), Schaefer
patent: 3215399 (1965-11-01), McInerney
patent: 3223380 (1965-12-01), Halmuth
patent: 3893652 (1975-07-01), Natbo
Baker Hughes Incorporated
Fox John C.
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