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At present, the most commonly used valve classification methods in the world and at home are as follows:
First, according to the structural characteristics, according to the direction of the closing member relative to the valve seat can be divided:
1. Cut gate shape: The closure moves along the center of the valve seat.
2. Gate shape: The closure moves along the center of the vertical seat.
3. Cocks and spheres: The closure is a plunger or ball that rotates around its own centerline.
4. Swivel-shaped; the closure rotates around the axis outside the valve seat.
5. Disc shape: The disc of the closing member rotates around the axis in the valve seat.
6. Slide valve shape: The closing member slides in the direction perpendicular to the channel. 
Second, according to the driving mode, according to different driving methods can be divided:
1. Electric: Drive by means of a motor or other electrical device.
2. Hydraulic: Driven by (water, oil). ? 3. Pneumatic; actuates the valve by means of compressed air.
4. Manual: With the handwheel, handle, lever or sprocket, etc., there is human-driven, drive a large torque, equipped with worm gear, gear and other deceleration devices.
Third, according to use, according to the different uses of the valve can be divided:
1, cut off with: used to turn on or off the pipeline medium, such as cut-off valve, gate valve, ball valve, butterfly valve and so on.
2, the use of non-return: used to prevent the media back, such as the check valve.
3, adjustment with: used to adjust the media pressure and flow, such as regulating valves, pressure reducing valve.
4, the use of distribution: used to change the medium flow, distribution of media, such as three-way cocks, distribution valves, slide valves.
5. Safety valve: When the medium pressure exceeds the specified value, it is used to discharge excess media to ensure the safety of piping systems and equipment, such as safety valves and accident valves.
6, other special purposes: such as traps, vent valves, drain valves and so on. 
Xiao Bian concludes: The above introduced the types of valves for everyone, and we hope to help everyone. For more relevant knowledge, please continue to pay attention to this website information platform. Follow-up will present more exciting content for everyone.
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Material: Carbon steel or stainless steel----Q235, 35#, 45#, 35CrMo, 42CrMo, 40Cr etc.
Specification:Complete range from M16 to M30 diameters without Length limit.
Finishing;plain(oiled),sherardized,hot dip galvanized, white zink plated, yellow zink plated, black, dacromet, geomet or others specified by the customers
high quality curve Tunnel Segment Bolt for concrete ring
A valve is a mechanical device that controls the flow, flow, pressure, temperature, etc. of a flowing fluid medium, and the valve is an essential part of the piping system. Valve fittings are technically the same as pumps and are often discussed as a separate category. What are the types of valves ? Let's look at it together.