Valve status monitoring
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United States of America Patent
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Apr 20, 2010
Grant Date -
Jan 24, 2008
app pub date -
Jul 5, 2005
filing date -
Jul 5, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A valve apparatus has a valve (1), an actuator (2) and a leakage sensor (3). A body (4) of the valve has first and second valve chambers (6, 8) connected to respective valve ports (10 & 12, 14 & 16) and joined by an intermediate passage (18). The valve can be set by the actuator to any one of three valve configurations. In an `open` configuration the intermediate passage is open to interconnect the first and second chambers. In a `closed` configuration, the intermediate passage is closed by first and second seals (24, 26) seated at respective locations in the passage to seal respectively between the first and second chambers and a leakage chamber (28) at the portion of the intermediate passage between the two seals. In a `cleaning` configuration one of the seals is unseated to connect a respective one of the first and second chambers to the leakage chamber, while the other seal remains seated. The leakage sensor is connected to the leakage chamber to provide a signal indicative of a leakage flow from the leakage chamber.
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