Classification of Valves
Outsiders often mistake faucets for valves. Actually, the faucet belongs to the bathroom series in a strict sense. Valves are divided into gate valves, globe valves, butterfly valves, high-pressure valves, low-pressure valves, fluorine-lined valves, safety valves, pressure relief valves, anti-corrosion valves, filters, check valves, pressure reducing valves, over-flow valves, ceramic valves, medium-pressure valves, high-temperature valves, low-temperature valves and so on.
Divided by Power
1. Automatic valve
A valve that operates by the power of the medium itself, such as check valves, pressure reducing valves, steam traps, safety valves, etc.
2. Drive valve
Valves operated by external forces such as manpower, electricity, hydraulic power and pneumatic power, such as globe valves, throttle valves, gate valves, disc valves, ball valves, plug valves, etc.
Divided by Structure
1. Globe type: The closing part moves along the centerline of the valve seat.
2. Gate type: The closing part moves along the centerline perpendicular to the valve seat.
3. Plug type: The closing part is a plunger or a ball that rotates around its own centerline.
4. Swing type: The closing part rotates around an axis outside the valve seat.
5. Butterfly type: The closing part is a disk that rotates around the axis in the valve seat.
Slide valve shape: the closing part slides in the direction perpendicular to the channel.
Divided by Use
1. Switch-off: used to cut off or connect the pipeline medium, such as globe valves, gate valves, ball valves, plug valves, etc.
2. Adjustment: used to adjust the pressure or flow of the medium, such as pressure-reducing valves and regulating valves.
3. Distribution: It is used to change the flow direction of media and play a distribution role, such as three-way cocks, three-way globe valves, etc.
4. Non-return use: used to prevent backflow of media, such as check valves.
5. Safe use: when the medium pressure exceeds the specified value, discharge excess medium to ensure the safety of the equipment, such as safety valves and emergency valves.
6.. Gas blocking and drainage: retain gas and drain condensate, such as steam traps.
Divided by the Manipulation Method
1. Manual valve: a valve operated by manpower with the help of handwheel, handle, lever, sprocket, gear, worm gear, etc.
2. Electric valve: a valve operated by electricity.
3. Pneumatic valve: a valve operated by compressed air.
4. Hydraulic valve: a valve operated by external force transmitted by liquid such as water and oil.
Divided by Pressure
1. Vacuum valve: the valve with absolute pressure less than 1kg/cm2.
2. Low-pressure valve: a valve with nominal pressure less than 16 kg/cm2.
3. Medium pressure valve: a valve with a nominal pressure of 25-64 kg/cm2.
4. High-pressure valve: a valve with a nominal pressure of 100-800 kg/cm2.
5. Ultra-high pressure: a valve with a nominal pressure of 1000 kg/cm2 or more.
Divided by Medium Temperature
1. Ordinary valves: valves suitable for medium working temperatures of-40℃ to 450℃.
2. High-temperature valves: suitable for valves with a medium working temperature of between 450℃ and 600℃.
3. Heat-resistant valves: suitable for valves with a medium working temperature above 600℃.
4. Low-temperature valves: it is suitable for valves with medium working temperatures from -40℃ to-70℃.
5. Cryogenic valves: valves suitable for medium working temperatures between -70℃ and -196℃.
6. Ultra-low temperature valves: suitable for valves with medium working temperature below-196℃.
Divided by Nominal Diameters
1. Small-diameter valve: a valve with a nominal diameter less than 40mm.
2. Medium diameter valve: a valve with a nominal diameter of between 50mm and 300mm.
3. Large diameter valve: a valve with a nominal diameter of between 350mm and 1200mm.
4 Extra-large diameter valve: the valve with a nominal diameter greater than 1400 mm.
The above classification is not absolute. However, mastering these basic classifications is of great benefit for a better understanding of various types of valves.
Divided by Power
1. Automatic valve
A valve that operates by the power of the medium itself, such as check valves, pressure reducing valves, steam traps, safety valves, etc.
2. Drive valve
Valves operated by external forces such as manpower, electricity, hydraulic power and pneumatic power, such as globe valves, throttle valves, gate valves, disc valves, ball valves, plug valves, etc.
Divided by Structure
1. Globe type: The closing part moves along the centerline of the valve seat.
2. Gate type: The closing part moves along the centerline perpendicular to the valve seat.
3. Plug type: The closing part is a plunger or a ball that rotates around its own centerline.
4. Swing type: The closing part rotates around an axis outside the valve seat.
5. Butterfly type: The closing part is a disk that rotates around the axis in the valve seat.
Slide valve shape: the closing part slides in the direction perpendicular to the channel.
Divided by Use
1. Switch-off: used to cut off or connect the pipeline medium, such as globe valves, gate valves, ball valves, plug valves, etc.
2. Adjustment: used to adjust the pressure or flow of the medium, such as pressure-reducing valves and regulating valves.
3. Distribution: It is used to change the flow direction of media and play a distribution role, such as three-way cocks, three-way globe valves, etc.
4. Non-return use: used to prevent backflow of media, such as check valves.
5. Safe use: when the medium pressure exceeds the specified value, discharge excess medium to ensure the safety of the equipment, such as safety valves and emergency valves.
6.. Gas blocking and drainage: retain gas and drain condensate, such as steam traps.
Divided by the Manipulation Method
1. Manual valve: a valve operated by manpower with the help of handwheel, handle, lever, sprocket, gear, worm gear, etc.
2. Electric valve: a valve operated by electricity.
3. Pneumatic valve: a valve operated by compressed air.
4. Hydraulic valve: a valve operated by external force transmitted by liquid such as water and oil.
Divided by Pressure
1. Vacuum valve: the valve with absolute pressure less than 1kg/cm2.
2. Low-pressure valve: a valve with nominal pressure less than 16 kg/cm2.
3. Medium pressure valve: a valve with a nominal pressure of 25-64 kg/cm2.
4. High-pressure valve: a valve with a nominal pressure of 100-800 kg/cm2.
5. Ultra-high pressure: a valve with a nominal pressure of 1000 kg/cm2 or more.
Divided by Medium Temperature
1. Ordinary valves: valves suitable for medium working temperatures of-40℃ to 450℃.
2. High-temperature valves: suitable for valves with a medium working temperature of between 450℃ and 600℃.
3. Heat-resistant valves: suitable for valves with a medium working temperature above 600℃.
4. Low-temperature valves: it is suitable for valves with medium working temperatures from -40℃ to-70℃.
5. Cryogenic valves: valves suitable for medium working temperatures between -70℃ and -196℃.
6. Ultra-low temperature valves: suitable for valves with medium working temperature below-196℃.
Divided by Nominal Diameters
1. Small-diameter valve: a valve with a nominal diameter less than 40mm.
2. Medium diameter valve: a valve with a nominal diameter of between 50mm and 300mm.
3. Large diameter valve: a valve with a nominal diameter of between 350mm and 1200mm.
4 Extra-large diameter valve: the valve with a nominal diameter greater than 1400 mm.
The above classification is not absolute. However, mastering these basic classifications is of great benefit for a better understanding of various types of valves.
