Gas Pressure Regulator Leakage refers to the flow of fluid through a gas pressure regulator under specified test conditions and with the gas regulator closed. The test conditions referred to here include that the actuator has sufficient thrust, the valve seat and the valve core can be compressed, and the gas pressure regulator has a certain pressure difference before and after, and is performed at room temperature.
What are the causes of leaks in gas regulators? What are the most common methods for detecting leaks?
When using the regulating valve, there are some occasions when the gas pressure regulator is closed, the leakage of the sealing surface between the valve core and the valve seat is as small as possible; some process conditions even require the regulating valve not to leak, therefore, in order to achieve For the purpose of low leakage, there are various structures and materials to be used. For example, a soft seal is used, that is, a soft material such as rubber or polytetrafluoroethylene is used as the sealing surface.
There are many factors that affect the amount of leakage, such as the amount of pressing force, the material of the sealing surface, the wear of the sealing surface, the force and deformation of the valve body, and the like. When testing, maintain a certain fluid pressure in front of the valve and measure the amount of leakage after the valve.
1 Test with water (or kerosene)
The signal pressure that drives the gas regulator in the actuator chamber can be set with a calibrator. The water supplied by the centrifugal pump can maintain the specified water pressure in front of the valve through the action of the pressure regulating cylinder, the pressure regulator and the pressure regulating valve. The magnitude of the water pressure can be read by a pressure gauge. After the gas pressure regulator is turned off, the test water pressure is stabilized, and the amount of leakage can be measured in the measuring cup after the valve, and the measurement time is recorded. If the amount of leakage is large, a larger container can be used.
2 test with air (or nitrogen)
The difference is that the test medium is changed to air (or nitrogen), the test pressure is changed to a high-power calibrator, and the rotor flow meter is used to measure the amount of gas leakage.
There are many ways to prevent gas regulators. The most important thing is to purchase a qualified gas pressure regulator.
