Pressure Test Methods and Pressure Test Management Regulations for Three Types of Valves
Classification:
Release Time：2017-08-02
Pressure test method of 1. pressure reducing valve ① The strength test of pressure reducing valve can usually be assembled after single piece test or after assembly test. After the bellows is welded with the component, the maximum pressure after the application of the pressure reducing valve is 1.5 times, and the strength test is carried out with air. The sealing test should be carried out according to the actual medium. When testing with air or water, the test shall be carried out at 1.1 times of the nominal pressure; when testing with steam, the maximum working pressure allowed at the working temperature shall be carried out. The difference between inlet pressure and outlet pressure shall not be less than 0.2MPa. The test method is as follows: after the inlet pressure is set, gradually adjust the adjusting screw of the valve in turn to make the outlet pressure
Pressure Test Method of 1. Pressure Reducing Valve
The strength test of the pressure reducing valve can usually be assembled after the single-piece test or after the assembly test. After the bellows is welded with the component, the maximum pressure after the application of the pressure reducing valve is 1.5 times, and the strength test is carried out with air.
The sealing test should be carried out according to the actual medium. When testing with air or water, the test shall be carried out at 1.1 times of the nominal pressure; when testing with steam, the maximum working pressure allowed at the working temperature shall be carried out. The difference between inlet pressure and outlet pressure shall not be less than 0.2MPa. The test method is as follows: After the inlet pressure is set, gradually adjust the adjusting screw of the valve in turn, so that the outlet pressure can be rapidly and continuously changed within the maximum and minimum values, without stagnation, blocking and other phenomena. For water and air pressure reducing valve, when the inlet pressure is set and the outlet pressure is zero, close the pressure reducing valve for sealing test, and no leakage within 2min is qualified.
Pressure Test Method for 2. Stop Valve and Throttle Valve
For the strength test of stop valve and throttle valve, usually put the assembled valve in the pressure test rack, open the valve disc, inject the medium to the specified value, and carefully check whether the valve body and valve cover are sweating and leaking. Can also be a single piece of strength test. Only stop valve shall be used for tightness test. During the test, the valve stem of the stop valve is in a vertical state, the valve flap is opened, and the medium is introduced from the bottom end of the valve flap to the specified value, and the packing and gasket are checked; after being qualified, close the valve flap and open the other end to check whether there is leakage. If the valve strength and sealing tests are to be done, the strength test can be done first, then the pressure is reduced to the specified value of the sealing test, and the packing and gasket are checked. Then close the valve clack and open the outlet end to check whether the sealing surface leaks.
Pressure Test Method of 3. Gate Valve
The strength test of the gate valve is the same as that of the stop valve. There are two methods for sealing test of gate valve.
① Open the gate to make the pressure in the valve rise to the specified value; then close the gate, immediately take out the gate valve, check whether there is leakage at the seal on both sides of the gate or directly inject the test medium into the plug on the valve cover to the specified value, and check the seal on both sides of the gate. The above method is called intermediate pressure test. This method is not suitable for sealing test in the nominal diameter DN32mm below the gate valve.
② Another method is to open the gate, so that the valve test pressure rose to the specified value, and then close the gate, open one end of the blind plate, check whether the sealing surface leakage. Then turn the head and repeat the above test until it is qualified. The tightness test at the packing and gasket of the pneumatic gate valve shall be carried out before the gate tightness test.
Wuhan Xiete Valve Technology Co., Ltd.Strictly follow the following pressure test management regulations:
1. All valves shall be inspected in detail after unpacking, including complete nameplates on the valve body, product quality certification documents, valves in closed state, no other damage such as flange surface, no dirt, protective covers at both ends, etc.
2. The operator is quite familiar with the operation of the pressure test bench.
3, the valve pressure test preparation work is perfect, the operator is familiar with the safety hazards of the valve pressure test, reverse transportation and other processes and has corresponding preventive measures.
4. The valve pressure test process is as follows: valve shell strength test, upper sealing test and sealing test.
Can be designed and manufactured according to user requirements or on-site working conditions
Learn more about other products can call Advisory
027-89708339
Related News
2026/02/28
Contact Information
+86 27-8970 8339
Address: No.5, Zhengjie, Shuangliu Street, Xinzhou District, Wuhan City, Hubei Province