Helium leak detector used in vacuum valves and other vacuum equipment leak detection

The sealing performance of the valve is one of the main indicators to evaluate the quality of the valve. Therefore, in the design and production of valves, it is necessary to improve their sealing performance, and the sealing of the valve should be tested in the last process before leaving the factory. Helium leak detection should be carried out before putting into use, and leak detection inspection should be carried out regularly during use. Especially the vacuum valve. At present, many domestic valve manufacturers use water detection method and air pressure method for air tightness detection, but this method can only detect the leakage hole is relatively large, and the minimum detectable leakage rate is generally 1X10E-3 mbar l/s.

However, with the continuous improvement of customer requirements for product quality, water inspection method and air pressure method have been unable to meet the requirements. In order to ensure product competition, many manufacturers have introduced helium leak detector. For the current commonly used leak detection methods, helium leak detection method is recognized as one of the most advanced and reliable methods. The helium mass spectrometry leak detector has the advantages of small volume, light weight, internal modular design, easy detection and maintenance, simple use, one-click operation and so on. Compared with traditional leak detection methods, helium detection has high detection efficiency, leak detection accuracy is 3-4 orders of magnitude higher, and will not cause any impact on equipment and workpieces, and good reliability, detection is not affected by temperature, humidity and other environment.

In the application of vacuum equipment, the vacuum failure of vacuum system is very common. How to avoid the occurrence of this situation, or when the vacuum degree is poor, it is very important for the manufacturer to find out the cause and solve the problem as soon as possible.

The usual solution of vacuum valve leak detection is to fill helium gas with set pressure into the valve, and detect it with helium mass spectrometry leak detector positive pressure method (suction gun method) at the detected place such as the valve stem.

Helium mass spectrometry leak detection method is suitable for vacuum equipment including vacuum containers, vacuum pipes, vacuum pumps, vacuum valves, vacuum coating equipment, vacuum drying equipment and other vacuum equipment.

In theory, no leakage system does not exist, so the purpose of leak detection is to reduce the leakage to an acceptable degree that does not affect the normal operation of the system, and the choice of vacuum system leak detection method is also determined according to the maximum allowable leakage rate of the inspected part.