According to nominal pressure:
Vacuum valve: refers to a valve whose working pressure is lower than the standard atmospheric pressure.
Low pressure valve: refers to the valve with nominal pressure PN ≤ 1.6Mpa.
Medium pressure valve: Refers to the valve with nominal pressure PN of 2.5Mpa, 4.0Mpa, 6.4Mpa.
High-pressure valve: refers to the valve whose nominal pressure PN is 10.0Mpa～80.0Mpa.
Ultra-high pressure valve: refers to the valve with nominal pressure PN ≥ 100.0Mpa.
By working temperature:
Ultra-low temperature valve: used for valves with medium working temperature t<-101°C.
Normal temperature valve: used for valves with medium working temperature -29°C<t<120°C.
Medium temperature valve: used for valves with medium working temperature of 120°C<t<425°C.
High temperature valve: used for valves with medium working temperature t>425°C.
By drive mode:
According to the driving mode, it can be divided into automatic valves, power driven valves and manual valves.
By nominal diameter
Small diameter valve: a valve with a nominal diameter DN≤40mm.
Medium diameter valve: a valve with a nominal diameter DN of 50-300mm.
Large diameter valve: a valve with a nominal diameter DN of 350-1200mm.
Extra-large diameter valve: a valve with a nominal diameter DN≥1400mm
According to structural features
The structural characteristics of the valve can be divided into:
Cut-off shape: the closing member moves along the center of the seat; such as a globe valve
Cock and ball: The closing member is a plunger or ball that rotates about its own centerline; eg, plug valve, ball valve
Gate shape: the closing member moves along the center of the vertical seat; such as gate valve, gate, etc.
Swing shape: the closing member rotates around the axis outside the valve seat; such as swing check valve, etc.
Butterfly: A disc of a closing member that rotates about an axis within a valve seat; such as butterfly valves, butterfly check valves, etc.
Spool type: The closure slides in a direction perpendicular to the passage. such as slide valve
By connection method
Threaded connection valve: the valve body has internal or external threads, and is connected to the pipe thread..
Flange connection valve: The valve body has a flange and is connected to the pipe flange.
Welding connection valve: the valve body has a welding groove and is welded with the pipe.
Clamp connection valve: the valve body has a clamp mouth, which is connected with the pipe clamp.
Ferrule connection valve: It is connected with the pipe by ferrule.
Wafer connection valve: a connection form in which the valve and the pipes at both ends are directly clamped together by bolts.
According to body material
Metal material valve: its valve body and other parts are made of metal material. Such as cast iron valves, cast steel valves, alloy steel valves, copper alloy valves, aluminum alloy valves, lead alloy valves, titanium alloy valves, Monel alloy valves, etc.
Non-metallic material valve: its valve body and other parts are made of non-metallic material. Such as plastic valves, enamel valves, ceramic valves, FRP valves, etc.