By power
Automatic valves: valves that rely on the medium's own force for action. Such as check valves, pressure reducing valves, traps, safety valves, etc.
Drive valve: rely on human power, electricity, hydraulic, pneumatic and other external forces to manipulate the valve. Such as globe valves, throttle valves, gate valves, disc valves, ball valves, plug valves, etc.
According to the use of
Cut-off valve: cut off or connect the pipeline media. Such as as of the valve, gate valve, ball valve, plug valve, etc..
Regulating valve: adjust the pressure or flow of the medium. Such as pressure reducing valves, regulating valves.
Check valve: to prevent the backflow of media. Such as check valves.
Distribution valve: change the direction of flow of the medium, play a distribution role. Such as three-way plug, three-way stop valve, etc.
Safety valve: the pressure exceeds the limit value, the discharge of excess media to ensure the safety of equipment. Such as safety valves, accident valves.
Gas blocking and drainage valve: retain gas, remove condensate, such as traps.
Open valve: cut off or connect the pipeline media. Such as up to the valve, gate valve, ball valve, plug valve, etc..
Control valve: adjust the pressure or flow of the medium. Such as pressure reducing valves, regulating valves.
Check valve: to prevent the backflow of media. Such as check valves.
Distribution valve: change the direction of flow of the medium, play a distribution role. Such as three-way plug, three-way stop valve, etc.
Safety valve: the pressure exceeds the limit value, the discharge of excess media to ensure the safety of equipment. Such as safety valves, accident valves.
Gas blocking and draining valve: retaining gas and removing condensate, such as traps.
According to the method of operation
Manual valves: with the help of handwheels, handles, levers, sprockets, gears, worm gears, etc., by human to manipulate the valve.
Electric valves: Valves operated with the help of electricity.
Pneumatic valves: valves operated with the help of compressed air.
Liquid valves: valves operated by external force with the help of water, oil and other liquids.
By pressure
Vacuum:Valves with an absolute pressure less than 1 kg/cm2.
Low pressure: valves with a nominal pressure of less than 16 kg/cm2.
Medium pressure: valves with a nominal pressure of 25-64 kg/cm2
High pressure: Valves with a nominal pressure of 100-800 kg/cm2.
Ultra-high: valves with nominal pressure of 1000 kg/cm2 or more
Divided by medium temperature
Normal valve: -40 to 450℃ (medium temperature)} of the valve.
High temperature valve: 450 to 600 ℃ (medium temperature) of the valve.
Heat-resistant valves: 600 ℃ or more (medium temperature) of the valve.
Low temperature valve: -40 to -70 ℃ (medium temperature) of the valve.
Deep cold valve: -70 to -196 ℃ (medium temperature) of the valve.
Ultra-low temperature valve: -196 ℃ below (medium temperature) of the valve.
According to the nominal diameter points
Small bore: nominal diameter of less than 40 mm valve.
Medium bore: nominal diameter 50 to 300 mm valve.
Large diameter: nominal diameter 350 to 1200 mm valve.
Extra-large bore: valves with a nominal diameter greater than 1400 mm.
The above classification is not absolute, can be classified from other angles, just master these basic classification, to understand the wide range of categories of valves or a great benefit.
Translated with www.DeepL.com/Translator (free version)
