Vacuum coating machine basic characteristics and types of valves

Vacuum coating machine vacuum valve characteristics, types: basic characteristics of the vacuum valve having high airtightness (sealing reliable); resistance to airflow as small as possible (i.e., the conductance valve as large as possible); a sealing member wear well, can be used repeatedly, long life; body material and seals put a small volume; flexible operation, easy to clean install, reliable performance and easy maintenance. In addition, the requirements for ultra-high vacuum valves can also bake temperature (450 ℃); on the throttle can even adjust the gas flow requirements.

Common vacuum valve body material mainly metal and glass. Manual vacuum valve actuator handwheel made of high strength plastic material. Glass vacuum piston known as "Hancock" is generally used on glass vacuum system, a small vacuum, vacuum gauge regulatory or calibration systems. The advantage is relatively easy to make, easy to use, easy to clean observation, chemical stability and good insulation, put less gas and so on. The downside is that because of the fragility of glass and curved mouth pistons coated with a layer of fat, so limit its scope. Vacuum industrial production needs, such as vacuum coating equipment, vacuum smelting equipment, vacuum heat treatment equipment, space environment simulation equipment, rocket engine simulation equipment, satellite surface charged analog devices, particle accelerators and controlled nuclear fusion equipment, heavy particle accelerators all metal valve.

Vacuum coating machine vacuum valves are usually classified according to the operating characteristics of the valve, drive principle, connection and usage can be divided into the following categories:
① according to the working pressure: low vacuum valve, high-vacuum valves, ultra-high vacuum valve;
② according to use: cut-off valves, isolation valves, charge (discharge) valve, throttle + feed valve closed valve,, etc;
③ According transmission principle: a manual valve, flashlight dual valves, solenoid valves, pneumatic valves, hydraulic vacuum valve;
④ according to the material: glass vacuum piston (Hancock), metal vacuum valve;
⑤ according to structural characteristics: a flapper valve, flap valves, butterfly valves, ball valves, valve rod, septum valve, gate valve, two-way valve, three-way valve, four-way valves, globe valves, right angle valve.