Valve Classification By Nominal Pressure:

1. Vacuum valve: The valves that working pressure is lower than standard atmospheric pressure.

2. Low pressure valve: The valves that nominal pressure PN≤1.6Mpa.

3. Middle pressure valve: The valves that nominal pressure are 2.5Mpa、4.0Mpa、6.4Mpa.

4. High-pressure valve: The valves that nominal pressure between 10.0Mpa～80.0Mpa.

5. Excess high pressure valves: The valves that nominal pressure PN≥100.0Mpa.

6. Strainer: The valves that nominal pressure are 1.0Mpa and 1.6Mpa.

Valve Classification By Operating Temperature:

1. Cryogenic valve: Medium operating temperature t≤-101℃.

2. Low temperature valve: Medium operating temperature -101℃≤t≤-29℃.

3. Normal temperature valve: Medium operating temperature -29℃

4. Medium temperature valves: Medium operating temperature 120℃≤t≤425℃.

5. High temperature valve: Medium operating temperature t>425℃.