The vacuum valve means working pressure below the standard atmospheric pressure of the valve. The structure is similar to the ordinary valves, only the lumen lower than the atmospheric pressure. According to the working pressure, it is divided into the ultra-high-vacuum valves, high vacuum valve and low vacuum valve. According to the main material of the valve,it is divided into carbon steel, stainless steel, aluminum alloy material . According to the transmission principle, Vacuum valve is divided into the electromagnetic dynamic, electric, pneumatic, manual. According to the structural characteristics,Vacuum valve is divided into ball valves, butterfly valves, diaphragm valves, flapper valve, flapper valve, angle valve, straight-through valve, three-way valve.