Nozzle check valve
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United States of America Patent
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Apr 22, 2014
Grant Date -
Jun 28, 2012
app pub date -
Dec 23, 2010
filing date -
Dec 23, 2010
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A check valve includes a valve body having a valve seat, a diffuser, a disc coupled to the diffuser, and a compression spring. The diffuser is positioned inside the valve body and has a forward face. The disc is coupled to and movable relative to the diffuser and has an upstream face and a downstream face. The compression spring biases the disc into a normally open position during forward flow. A check valve apparatus further comprises at least one test bore through the valve member in communication with the disc. A method for testing the operation of a passive check valve is also disclosed.
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