Inspection and Test of Medium and Low Pressure Valves

Test

Inspection and test of medium and low pressure valves

Test method and procedure of shell:
1. Close the inlet and outlet of the valve and press the packing gland to make the hoist in the partially open position.
2. Fill the body cavity shell with medium and gradually pressurize it to the test pressure.
3. After reaching the specified time, check whether the shell (including the stuffing box and the joint between the valve body and the bonnet) has leakage See the table for test temperature, test medium, test pressure, test duration and allowable leakage rate of shell test.

Methods and steps of sealing performance test:
1. Close both ends of the valve, keep the hoist slightly open, fill the body cavity with medium, and gradually pressurize to the test pressure.
2. Close the hoist, release the pressure at one end of the valve, and pressurize the other end in the same way.
3. The above sealing and valve seat sealing tests (according to the specified pressure) must be carried out for each set before leaving the factory to prevent leakage See the table for the test temperature, test medium, test pressure, test duration and allowable leakage rate of the seal test.