valve is a mechanical device that controls the flow, direction, pressure, temperature, etc. of the flowing fluid medium. The valve is a basic component in the pipeline system. Valve fittings are technically the same as pumps and are often discussed as a separate category. So what are the types of valves? Let’s take a look together.
At present, the most commonly used international and domestic valve classification methods are as follows:
1. According to the structural features, it can be divided according to the moving direction of the closing member relative to the valve seat:
1. Sectional gate shape: The closing piece moves along the center of the valve seat.
2. Gate shape: The closing piece moves along the center of the vertical valve seat.
3. Cock and ball: The closing part is a plunger or ball, which rotates around its own centerline.
4. Swing shape; the closing piece rotates around the axis outside the valve seat.
5. Dish shape: The disc of the closing member rotates around the axis in the valve seat.
6. Slide valve shape: The closing piece slides in a direction perpendicular to the channel.
2. According to the driving mode, it can be divided into different driving modes:
1. Electric: Driven by motors or other electrical devices.
2. Hydraulic: driven by (water, oil).
3. Pneumatic; use compressed air to drive the valve to open and close.
4. Manual: With the help of handwheel, handle, lever or sprocket, etc., it is driven by manpower, and when the transmission torque is large, it is equipped with worm gear, gear and other deceleration devices.
Three, according to the purpose, according to the different purposes of the valve can be divided into:
1. For breaking: used to connect or cut off pipeline media, such as globe valves, gate valves, ball valves, butterfly valves, etc.
2, non-return use: used to prevent the medium from flowing back, such as a check valve.
3, adjustment: used to adjust the pressure and flow of the medium, such as regulating valve, pressure reducing valve.
4. Distribution: used to change the flow direction of the medium and distribute the medium, such as three-way cock, distribution valve, slide valve, etc.
5. Safety valve: When the pressure of the medium exceeds the specified value, it is used to discharge excess medium to ensure the safety of the piping system and equipment, such as safety valves and emergency valves.
6. Other special purposes: such as traps, vent valves, drain valves, etc.
Post time: Oct-30-2021