By nominal pressure:
(1) Vacuum valve: refers to the working pressure is lower than the standard atmospheric pressure valve.
(2) low pressure valve: refers to the nominal pressure PN ≤ 1.6Mpa valve.
(3) Medium pressure valve: refers to the nominal pressure of PN 2.5Mpa, 4.0Mpa, 6.4Mpa valve.
(4) high-pressure valve: refers to the nominal pressure PN is 10.0Mpa ~ 80.0Mpa valve.
(5) high pressure valve: refers to the nominal pressure PN ≥ 100.0Mpa valve.
By working temperature:
(1) cryogenic valve: for medium temperature t <-101 ℃ valve.
(2) room temperature valve: for medium temperature -29 ℃ <t <120 ℃ valve.
(3) the temperature valve: for medium temperature 120 ℃ <t <425 ℃ valve.
(4) high temperature valve: for the medium temperature t> 425 ℃ valve.
