Briefly describe the working principle of pneumatic control valves

Installation principle of pneumatic control valve:

1. The installation position of the pneumatic control valve requires a certain height from the ground, and there should be a certain space above and below the valve for disassembly, assembly, and repair. For regulating valves equipped with pneumatic valve positioners and handwheels, it is necessary to

It is necessary to ensure ease of operation, observation, and adjustment.

2. The regulating valve should be installed on a horizontal pipeline and perpendicular to the pipeline, generally supported under the valve to ensure stability and reliability. For special occasions where the regulating valve needs to be installed horizontally on a vertical pipeline,

The regulating valve should also be supported (except for small-diameter regulating valves). During installation, avoid adding additional stress to the regulating valve.

3. The working environment temperature of the regulating valve should be within (-30~+60) and the relative humidity should not exceed 95%.

4. There should be a straight pipe section at the front and rear positions of the regulating valve, with a length not less than 10 times the diameter of the pipeline (10D), to avoid the valve's straight pipe section being too short and affecting the flow characteristics.

5. When the diameter of the regulating valve is different from that of the process pipeline, a reducing pipe should be used for connection. When installing small-diameter regulating valves, threaded connections can be used. The fluid direction arrow on the valve body should be consistent with the fluid direction.

6. To set up a bypass pipeline. The purpose is to facilitate switching or manual operation, allowing for maintenance of the regulating valve without stopping the vehicle.

7. Before installation, the regulating valve should be thoroughly cleaned of foreign objects such as dirt, welding slag, etc. in the pipeline. Working Principle:

Pneumatic control valve is a type of valve that uses compressed air as a power source, a cylinder as an actuator, and accessories such as electrical valve positioners, converters, solenoid valves, and holding valves to drive the valve, achieving on-off or proportional control

Adjust and receive control signals from industrial automation control systems to regulate various process parameters such as flow rate, pressure, temperature, etc. of pipeline media. The characteristics of pneumatic control valves are simple control, fast response, and

Quality and safety, no additional explosion-proof measures are required. Storage, installation, and usage precautions

1. This valve should be stored in a dry room, and both ends of the passage must be blocked. No stacking or storage allowed

2. Regulating valves stored for a long time should be regularly inspected to remove dirt, and rust proof oil should be applied to all moving parts and processing surfaces to prevent rusting.

3. This valve should be installed on a horizontal pipeline and must be installed vertically. The valve stem is facing upwards.

4. The installation must be carried out according to the flow direction of the medium indicated by the arrow in the diagram.