Valve structure for use in a pipe coupling and a pipe coupling comprising the valve structure
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United States of America Patent
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Mar 29, 2005
Grant Date -
Oct 28, 2004
app pub date -
Apr 23, 2004
filing date -
Apr 24, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A female or male coupler of a pipe coupling comprises a valve which is located in a fluid passage and is axially movable therein. The valve has a valve head which is provided with a sealing ring to be engaged with and disengaged from a valve seat formed on a wall surface defining the fluid passage of the coupler. The sealing ring is installed in an annular groove formed in the valve head. The bottom, or vicinity thereof, of the annular groove, which is isolated from the outside or the fluid passage by the sealing ring, is fluidly communicated with the exterior surface of the valve via a communication passage formed in the valve. As a result, even if a sudden large decrease in pressure is generated in the fluid passage, a pressure in the bottom, or the vicinity thereof, of the annular groove equalizes with the pressure in the fluid passage.
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