1. The sealing performance of the valve is good, and the leakage rate of the valve plate seal is small.
2. The valve plate should have as much flow conductivity as possible after opening.
The material used in the valve should have low saturated vapor pressure, high corrosion resistance and chemical stability, wear resistance, long service life, and the ultra-high vacuum valve should be able to withstand baking.
4. The valve structure should be simple, the switch is light and labor-saving, with signs, and the transmission mechanism should be tested under high pressure.
5 The form, basic parameters, connection dimensions and technical conditions of vacuum valves shall be implemented in accordance with the national professional standards.