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2019

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Valve types and valve classifications

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Valves have a wide range of uses and types, and the difficulty of classifying valves is also increasing. In order to better understand valve products, Duoyi Company has specially classified common valves. The types of valves are classified according to the actual working conditions on site. Some Depending on the manufacturer's own selection and special circumstances, different uses and working principles will vary. Generally speaking, it can be divided into two categories: Type *** automatic valve: a valve that relies on the ability of the medium (liquid, gas) itself to act on its own. Such as check valves, regulating valves , steam traps, pressure reducing valves , safety valves, pulse dampers, back pressure valves, electric ball valves , etc.

 

Valves have a wide range of uses and types, and the difficulty of classifying valves is also increasing. In order to better understand valve products, Duoyi Company has specially classified common valves. The types of valves are classified according to the actual working conditions on site. Some Depending on the manufacturer's own selection and special circumstances, different uses and working principles will vary. Generally speaking, it can be divided into two categories: Type *** automatic valve: a valve that relies on the ability of the medium (liquid, gas) itself to act on its own. Such as check valves, regulating valves , steam traps, pressure reducing valves , safety valves, pulse dampers, back pressure valves, electric ball valves , etc.

The second type of driven valve: valves that use manual, electric, hydraulic, or pneumatic controls to control action, such as butterfly valves , gate valves , ball valves , gate valves , globe valves , throttle valves , plug valves, etc.

At present, the most commonly used valve classification methods internationally and domestically are as follows:

1.  Portal shape: The closing member moves along the center of the valve seat.

2.  Gate shape: The closing member moves along the center of the vertical valve seat.

3.  Plugs and Balls: The closure is a plunger or ball that rotates about its centerline.

4. Swing type; the closing member rotates around the axis outside the valve seat.

5.  Disc: The disc of the closure that rotates about an axis within the valve seat.

6.  Spool type: The closing member slides in the direction perpendicular to the channel.

2. According to the driving mode, it can be divided into different driving modes:

1. Electric: Driven by a motor or other electrical device.

2. Hydraulic: driven by (water, oil).

3. Pneumatic; uses 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 human power. When transmitting large torque, it is equipped with reduction devices such as worm gears and gears.

3. According to use, valves can be divided into different uses:

1.  For breaking: used to connect or cut off pipeline media, such as stop valves, gate valves, ball valves, butterfly valves, etc.

2.  Check use: Used to prevent medium from flowing back, such as check valves.

3.  Adjustment: Used to adjust the pressure and flow of the medium, such as regulating valves and pressure reducing valves.

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 medium pressure exceeds the specified value, it is used to discharge excess medium to ensure the safety of the pipeline system and equipment, such as safety valves and emergency valves.

6.  Other special uses: such as drain valves, vent valves, sewage valves, etc.