Any machine needs power to operate, some are external fuel power, and some are the effect of using energy conversion to obtain power. The valve of the machine is one of the tools that use the energy conversion to start the machine. So, how to choose a pneumatic flow valve?

The selection of pneumatic flow valve should focus on solving the following problems:

1. It is necessary to consider whether the technical specifications of the valve can meet the requirements of the use environment. Pneumatic flow valve working pressure range, power supply conditions (AC, DC and voltage, etc.), medium temperature, ambient temperature, humidity, dust, etc.

2. Consider whether the function and function of the valve meet the requirements. Please select a valve that matches the function as closely as possible.

3. Select the path according to the traffic. Distinguish between the main valve and the pilot valve for control. The main valve should be routed according to the flow of the actuator. The pilot valve (signal valve) should select the channel according to the distance, quantity and time of the required action of the control valve.

3. Select the structural form of the valve according to the use conditions and use requirements. If tight sealing is required, soft-sealing valves are usually selected. If low exchange force is required and memory performance is required, the spool valve should be selected. If the air source filter condition is not good, it is recommended to use a shut-off valve.

4. Select the installation method, and it is recommended to consider the board connection in terms of installation and maintenance. Especially in the case of centralized automatic semi-automatic control system, the advantages are more obvious.

5. Selection of types: When designing the control system, the types of valves should be minimized, the use of special valves should be avoided, and standardized series should be selected to facilitate specialized production, cost reduction and use of services.

6. Selection of pneumatic flow valve The type and pressure adjustment accuracy are selected according to the use requirements, and the path pressure reducing valve is selected according to the larger output flow. Generally, it should be installed after the water distributor, oil mist or before check-in. Entry and exit cannot be reversed. When the valve is not in use, loosen the handle to prevent the diaphragm from being deformed by pressure and affecting its performance.

7. The selection of the pneumatic flow valve should be based on the type selected according to the use requirements, and the diameter should be selected according to the larger output flow. Re-selecting pneumatic flow valves to adjust the speed of pneumatically actuated components is more difficult than hydraulic flow valves. Because gas is compressible.

8. When choosing a pneumatic flow valve, please pay attention to the following: the pipeline must not leak air, the lubrication between the cylinder and the piston is in good condition, the flow control valve should be installed near the cylinder or gas motor, and please use the outlet throttle speed regulation method as much as possible. , the applied load should be stable.

9. The valve body uses cast iron material, pressure resistance level, temperature range, anti-corrosion, etc., which should not be lower than the requirements for the process pipeline, but special consideration should be given when the medium is flammable and explosive fluid. The selection of valve core and valve material should consider the wear of solid particles on the fluid and the effect of vaporization on the inside of the valve.