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 resistance, can be used repeatedly, and long life; Valve materials and seals outgas small; easy to clean install flexible operation and reliable performance, easy maintenance in addition. For ultra-high vacuum valves can also require high temperature baking (450 ℃); on the throttle can even adjust the gas flow requirements

1. According to the working pressure: low vacuum valves, high vacuum stuffy door, ultra-high vacuum valve

2.According to use: cut-off valves, isolation valves, charge (discharge) valve, throttle, valve, closing the feed valve

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, operated valves, ball valves, connecting rods valves, septum valve, gate valve, two-way valve, three-way valve, four-way valves, globe valves, right angle valve