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Three methods for verifying safety valves
The first step is offline calibration of the calibration table, which involves installing the safety valve on the calibration table, and then using a calibration medium to open the safety valve. The opening pressure is confirmed by observing the pressure gauge. This method cannot consider the calibration of back pressure safety valves and safety valves for high or low temperature media;
Next is the boost jump method. The safety valve is installed in the system, and the system artificially increases the pressure until the safety valve jumps to observe the opening pressure of the safety valve. This verification method causes significant damage to the sealing surface of the safety valve and poses a high risk of operation;
Next is online instrument calibration. It is to measure the downward spring force acting on the safety valve through external force, in order to calculate the opening pressure of the safety valve. This method generally does not affect production, and the system pressure does not need to be changed. The detection speed is relatively fast and convenient, but this method cannot detect the sealing performance of the safety valve.
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