（1）Vacuum valve: the working pressure below standard atmospheric pressure valve.
(2) Low pressure valve: refers to the nominal pressure PN ≤1.6Mpa valve.
(3) pressure valve: that, PN is 2.5Mpa, 4.0Mpa, 6.4Mpa valve.
(4) High-pressure valve: refers to 10.0Mpa ~ 80.0Mpa, PN valve.
(5) high pressure valve: refers to the nominal PN≥100.0Mpa valve.
(6) Filters: refers, PN is 1.0Mpa, 1.6Mpa
Valves for fluid control systems, from simple cut-off valve to a variety of highly complex automatic control valves used in the system, which is quite a range of varieties and specifications. The valve can be used to control the flow of air, water, steam, corrosive media, mud, oil, liquid metals and radioactive media and other types of fluids. Valve is also divided into cast iron valves, cast steel valves, stainless steel valves (201,304,316 etc.), chromium molybdenum steel valves, chrome molybdenum vanadium steel valves, dual-phase steel valves, plastic valves, valves and other non-standard custom material according to the material .
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