Method for checking the leakproofness of safety valves

摘要

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.

主权项

1. A method for checking the leakproofness of two controllable valves, wherein the valves are disposed at opposite ends of a test volume, wherein an inlet pressure pe is present upstream of the test volume, in front of valve VI, and wherein an outlet pressure pa is present downstream of the test volume, behind valve V2, where pe>pa and wherein the pressure in the test volume is equal to pz,
wherein a control device triggers the valves for the opening and closing and wherein the control device is coupled with at least two pressure switches which are both in an operative connection with the test volume for the pressure monitoring, wherein: setting the first pressure switch to a first triggering threshold d1, wherein d1=pe/x where x≧3, setting the second pressure switch to a second triggering threshold d2, wherein d2=pe (1-1/x), wherein one of the following two groups of steps is executed with each leakproofness check: first step sequence:
triggering of valve V1 in order to open the latter for a time period tL1 and then to close it,awaiting a measurement period tM1 ,checking the second pressure switch and abortion of the process with the recognition of the leakage of valve V2 if pzd1; second step sequence:
triggering of valve V2 in order to open the latter for a time period tL2 and then to close it,awaiting a measurement period tM2,checking the first pressure switch and abortion of the process with the recognition of the leakage of valve V1 if pz>d1,triggering valve V1 in order to open the latter for a time period tL1 and then to close it,awaiting a measurement period tM1,checking the second pressure switch and abortion of the process with the recognition of the leakage of valve V2 if pz