Method for checking the leakproofness of safety valves
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United States of America Patent
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Jul 14, 2015
Grant Date -
Jun 26, 2014
app pub date -
Jun 26, 2012
filing date -
Jun 27, 2011
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Abstract
Method for checking the leakproffness of safety valves. Method for testing the leadkproofness of two controllable valves (V1, V2), wherein the vales are arranged at opposite ends of a test volume (10). An inlet pressure pe is present upstream of the test volume, in front of valve V1, and an outlet pressure pa is present downstream of the test volume, behind the valve V2. A control device controls the valves to open and close, and the control device is coupled to at least two pressure switches (26, 27) which are both operatively connected to the test volume (10) in order to monitor the pressure. The first pressure switch is set to a first triggering threshold d1, wherein d1=pe/x, where x>3. The second pressure switch is set to a second triggering threshold d2, wherein d2=pe(1−1/x). A valve is controlled in order to open the valve for a period of time tL1 and then to close said valve. The process then waits for a measurement period tM1 and a first pressure switch is checked. The second valve is then opened and closed again and the second pressure switch is checked. The functionality of the valves is indicated if the method has not been aborted owing to a pressure switch being triggered.
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