Testing valve assemblies
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United States of America Patent
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Jan 6, 2004
Grant Date -
Jul 17, 2003
app pub date -
Jan 15, 2002
filing date -
Jan 15, 2002
priority date (Note) -
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Abstract
A method of determining flow through a valve includes determining a first differential pressure across the valve. The valve is bypassed and a second differential pressure is determined across the valve. A flow decision is determined for the valve based on comparison of the first and second differential pressures. A method of testing a relief valve in a reduced pressure backflow preventer assembly includes determining a first differential pressure across an upstream check valve during a no flow condition. The upstream check valve is bypassed for the purpose of opening a relief valve, and a zone vent is opened.
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