Working principle diagram of double acting pneumatic pneumatic ball valve (1. Pneumatic head 2. Solenoid valve 3. Filter pressure reducing valve 4. Air source) Figure 1 is the working principle diagram of a set of double acting pneumatic pneumatic ball valve. Compressed air (air source) first passes through the filter pressure reducing valve to remove the water, oil and solid dust particles contained therein, and adjust the system pressure to the set value to provide stable air source pressure. Then, the gas flows into the solenoid valve inlet a, flows into the pneumatic head from the air port b, and pushes the piston to act. The exhaust channel is d~E. After the coil is powered on, the solenoid valve reverses. The gas flows into the pneumatic head from the air port d, and pushes the piston to act in the opposite direction. The exhaust channel is b~c. Figure 2 Schematic diagram of single acting pneumatic pneumatic ball valve (1. Pneumatic head 2. Solenoid valve 3. Filter pressure reducing valve 4. Air source), At the same time, the spring in the pneumatic head is compressed. In case of failure (loss of air or power), the solenoid valve returns to the spring position, the air source is blocked, the pneumatic head spring releases the compression force, and pushes the piston to move in the opposite direction. The exhaust channel is b~c. The valve can be left at the set open or closed position to prevent accidents.

What are the basic elements of pneumatic butterfly valve selection?
Five elements of model selection:
(1) Size: nominal diameter of hose, selection of connector type (mainly flange connection, thread connection, quick connector connection), size of pneumatic butterfly valve, and hose length.
(2) The pressure shall be based on the practical working pressure of the hose, and then the nominal diameter and pressure gauge of the corrugated pneumatic butterfly valve shall be inquired to determine whether the pneumatic butterfly valve of stainless steel mesh sleeve type can be used.
(3) The chemical properties of the medium recommended in the medium hose determine the material of each part of the hose according to the corrosion resistance of the hose material.
(4) The working temperature and range of the medium in the temperature hose; Ambient temperature when the hose is working. In case of high temperature, it is necessary to confirm the pressure after temperature correction according to the temperature correction coefficient of working pressure under high temperature of pneumatic butterfly valve, so as to ensure the correct pressure level is selected.
(5) The status is based on the status when the hose is used, referring to the correct application and installation methods of the pneumatic butterfly valve and the optimal length of the hose for settlement compensation. What are the characteristics of the stainless steel pneumatic butterfly valve