Pressure relief valve
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United States of America Patent
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Mar 20, 2012
Grant Date -
Jul 16, 2009
app pub date -
Dec 28, 2005
filing date -
Dec 28, 2005
priority date (Note) -
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Abstract
A pressure relief valve for blown fiber closures is provided having constituent components fabricated from plastic. An adaptor is provided for connection to a blown fiber closure, and a body welded to this adaptor, is provided to enclose a piston and a spring within, such that they are protected from the ingress of silt and water. The piston is arranged to provide a double seal such that a pressure relief valve plug and an opening in the enclosing body are closed or opened simultaneously to prevent the ingress of silt and/or water on the one hand and the unhindered escape of pressurized fluid on the other.
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