Fluid handling – Systems – Sequentially progressive opening or closing of plural valves
Patent
1993-11-01
1994-12-06
Nilson, Robert G.
Fluid handling
Systems
Sequentially progressive opening or closing of plural valves
F16K 1312
Patent
active
053701550
ABSTRACT:
A wedge type gate valve in which a pressure equalizing valve is located in a chamber in the wedge-shaped valve member which is vented to the downstream side of the gate to equalize system pressure prior to opening the valve by using a ball-valve rotationally mounted in chamber. The ball-shaped valve is operated by the stem which operates the gate-valve for limited rotational movement between two stops of a connecting member in such a way that the stem rotational movement is stopped at a predetermined point when the sealed internal ball-shaped valve is fully opened or fully closed, thereby opening or closing the wedge-shaped member pressure equalizing passage. The vent passage which opens from the pressure equalizing valve chamber to the downstream side of the gate also permits the evacuation of fluids from the annular space above the gate.
REFERENCES:
patent: 745774 (1903-12-01), Brady
patent: 1549609 (1925-08-01), Redding
patent: 1932471 (1933-10-01), McKellar
patent: 4580603 (1986-04-01), Schoen
patent: 4678008 (1987-07-01), Gyongyossy
Johnson Kenneth H.
Nilson Robert G.
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