Leakage detection of high-pressure solenoid valves for pvd coating machine is a very challenging task for high-pressure solenoid valve products used in natural gas filling stations or industrial gas pipeline transmission such as hydrogen. In order to ensure that the hydrogen does not overflow the valve, this requires a very low leakage rate to test the product, which is no more than 1×10-6 mbar l/sec. After comparative testing: this leakage rate range is much lower than the leakage rate of air that we can see bubbling out of water (the maximum visible air foam in water is about 10-3 mbar l/sec).

pvd coating machine customized leak detection system Technical requirements:
1, the pressure of the valve between 0.5 and 360 bar. All tests are performed in a fully automated environment.
2. Test gas recovery system for sustainable measurement and free choice of test gas concentration. Technical Requirements Background: If a valve is filled with helium, the subsequent continuous filling of helium will be reduced. About 180 liters of helium will be released in a single cycle test system with a pressure of 360 bar and an internal valve capacity of 0.5 liters. Helium is an expensive test gas due to the complexity of the production process and the cost of the gas. Testing gas recovery systems can bring additional benefits, both economically and ecologically. And the recycling rate can reach more than 95%.
3, In order to ensure that the calibrated test pressure is above 360 bar and to avoid any possible pressure peaks, it is necessary to develop a high pressure comparison system with a pressure of up to 500 bar, whose test gas requires a specially equipped buffer container to store it in order to gradually release the gas downward.
4, in addition, the pvd coating machine customized leakage system also requires an additional functional valve test system: when the nitrogen pressure is above 100bar, the pressure from the valve can flow into the atmosphere. In this process, the flow speed can reach 2.5 times the speed of sound, and the result is extremely loud, which requires a special silencing device.