Method and device for maintaining a fluid pressure in a defined volume
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United States of America Patent
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Oct 19, 2004
Grant Date -
Jan 8, 2004
app pub date -
Apr 28, 2003
filing date -
Jun 5, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and a regulating valve for maintaining a fluid pressure within a defined volume (3), and simultaneous registering of discharge of fluid from the volume as a result of leakage or consumption. The fluid is supplied from a pressure regulating valve (20) provided with a means (5-7, 22-26) which opens for the supply of fluid to the volume (3) when the pressure therein has sunk below a first value (P1), and which shuts off the fluid supply when the pressure in the volume (3) has achieved a preset second value (P2) which is substantially higher than the first value (P1). Thus, after each opening of the regulating valve (20) there occurs a distinct pressure increase at the valve outlet. This pressure increase is registered as a pressure pulse, and the frequency of delivered pressure pulses is monitored and utilised as a measure of occurring leakage and/or consumption of the supplied fluid.
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