The Role of the Vacuum Valve
- Open and close the air circuit. When valve 1 and valve 4 are closed, and valve 2 is opened, the mechanical vacuum pump III vacuums container I, and the air flows through the pre-vacuum pumping pipeline; when valve 2 is closed and valve 4 is opened, the mechanical pump can Vacuum the diffusion pump separately; when valve 1 and valve 4 are opened at the same time, the diffusion pump and the mechanical pump can work at the same time to evacuate the container, and the airflow flows through the diffusion pump. It can be seen that the function of the valve in this operation is to switch the air path and change the route of the air flow.
- Control the air flow and adjust the vacuum degree. In Figure 1, the opening angle of the valve cover of valve 1 can be adjusted to adjust the air flow through the pipeline; valve 2 and valve 4 are closed, and the air release valve 3 can be used to pump The inlet of III is put into the atmosphere; the vacuum degree in the container can be adjusted through the air release valve 5.
- Quantitative inflation. There is a small hole of a certain volume in the plunger of the glass valve. When the small hole is turned to the right and connected to the high-pressure gas cylinder, the small hole can be filled with high-pressure gas; when it is turned to the left and connected to the vacuum container , Put the volume of high-pressure gas into the container, which plays the role of quantitative inflation.
There are many types of vacuum valves, which are usually classified according to the valve’s function, structure, drive mode, material and use.