Combination ball valve and pressure relief valve assembly
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United States of America Patent
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-
Dec 24, 1996
Grant Date -
N/A
app pub date -
Nov 15, 1995
filing date -
Nov 15, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
To provide pressure relief in a fluid line of a fluidic circuit, the ball element of a shutoff valve incorporates a tube that is aligned with a pair of valve ports when the ball is in the closed valve position. A miniature check valve, positioned in the tube, operates, depending on its orientation, to check fluid flow through the tube between the valve ports in one direction and to vent fluid through the tube in the opposite direction in response to excessive fluid pressure. In an alternative embodiment, a pair of tubes are incorporated into the ball valve element, with the check valves therein oriented in opposed directions to provide bidirectional pressure relief between the valve ports.
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