Shut-off trim including spring loaded check valve
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United States of America Patent
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May 3, 2016
Grant Date -
Jun 26, 2014
app pub date -
Jan 16, 2014
filing date -
Jun 10, 2010
priority date (Note) -
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Abstract
In accordance with the present invention, there is provided a bi-directional shut-off trim for a valve which possesses the functional attributes of a pilot operated trim and a balanced trim through the integration of a spring loaded check valve into a pilot trim. In forward flow isolation, the bi-directional shut-off trim of the present invention acts as a normal pilot operated trim. In reverse flow, the check valve of the shut-off trim opens to balance the pressure on either side of the plug thereof.
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