Wedge-type gate valve
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United States of America Patent
Stats
-
Dec 6, 1994
Grant Date -
N/A
app pub date -
Nov 1, 1993
filing date -
Nov 1, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Cited Art Landscape
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