1.Switch, gas lines, valves 1 and 4 when the valve is closed, valve 2 is open, mechanical vacuum pump flows Ⅲ on the container I vacuum, air passes through the pre-vacuum exhaust pipe when the valve 2 is closed, the open valve 4, the mechanical pump alone on the diffusion pump vacuum, and if the valve 1 and valve 4 is open at the same time, diffusion pump and mechanical pump can be simultaneously on the container it is working to take the time when the air flows through the diffusion pump . Shows the valve in this operation is to switch gas, change the air flow through the line.

　　2. flow control size, adjust the vacuum in Figure 1, the control valve 1 of the opening angle of the valve cover, you can adjust the volume of air flowing through the pipe size; off valve 2 and valve 4 through the drain valve to the mechanical pump 3 ⅲ can put into the atmosphere of the entrance; 5 can be adjusted via the drain valve of the vacuum container.

　　3.of quantitative inflation, has the glass valve lifters, a certain volume of holes, if the hole can be filled on the right side connectivity and high-pressure cylinder, the hole in the high-pressure gas, and when it turned left and the vacuum vessel connected, the volume increased by high-pressure gas into the container, so that played a role in the quantitative inflation.

　　A wide range of vacuum valves, usually through the valve function, structure type, drive, and use of classified information.