A variety of methods can be used to detect whether there is leakage of the vacuum valve, and each of these methods has its own applicable scenarios and advantages and disadvantages. Here are some common detection methods:
First, the appearance inspection method
This is the most basic method, by observing the appearance of the vacuum valve to determine whether there is a leak. The inspection includes whether there are cracks, carbon deposits, corrosion and other abnormal conditions on the valve surface, and whether there is dirt or damage on the valve sealing surface. These abnormal conditions may lead to leakage of the vacuum valve.
Second, thermometer detection method
Use a thermometer to check the temperature of the subsequent line adjacent to the vacuum valve. If there is a leak in the vacuum valve, the temperature of the adjacent subsequent line will increase or decrease significantly. This method can quickly locate areas where there may be leaks.
Third, stethoscope diagnosis
Use a stethoscope (or similar tool, such as a screwdriver) to detect leaks in the vacuum valve. Hold one end of the stethoscope against the appropriate position of the vacuum valve or line, and the other end against the ear, and listen carefully for any abnormal “piercing” sound. This sound usually indicates the turbulent sound generated by the gas when it is leaked, so that it can be determined whether the vacuum valve is leaking.
Fourth, helium leak detection method
Helium leak detection is a highly sensitive detection method, especially suitable for high vacuum and ultra-high vacuum systems. By injecting helium into the system to be detected and using helium mass spectrometer to detect whether there is helium leakage in the system, the leak point can be accurately located. This method can detect very small leaks, but requires specialized equipment and technical support.
Fifth, pressure difference method
The pressure difference method sets the pressure difference on both sides of the vacuum valve and observes the pressure change to determine whether there is leakage of the valve. If there is a leak in the vacuum valve, then the pressure difference between the two sides will change. This method requires accurate pressure gauges and calculation methods, and also needs to consider the impact of environmental factors on the pressure.
Sixth, ultrasonic detection method
Ultrasonic detection method is a high sensitivity detection method, especially suitable for sealed structure systems. When the gas passes through the vacuum valve from the high pressure end to the low pressure end, if there is a leak, the gas will generate turbulence at the leak point and produce a strong ultrasonic signal. By detecting these signals through the ultrasonic detector, it can accurately determine whether the vacuum valve leaks.
Seventh, infrared leak detection method
The infrared leak detection method is suitable for vacuum leak detection of visible transparent materials, such as glass or organic materials. The infrared camera or infrared thermal imager is used to shoot the detection system, and the infrared radiation is used to detect whether there is a leak point in the system. If there is an area of abnormal radiation, there may be a leak.
In practical application, the suitable detection method can be selected according to the type of vacuum valve, the use environment and the accuracy requirements of leakage detection. For important vacuum systems, it is recommended to adopt a combination of various methods for comprehensive inspection to ensure the stable operation of the system.
