Pneumatic transmission is a transmission method that is very similar to hydraulic transmission in the working principle. Because its working medium has many advantages such as clean and cheap, convenient access and handling, and low resistance to flow, the application of pneumatic transmission technology has become more and more extensive.

With the in-depth application of the pneumatic system, we have learned more about this fluid transmission technology, and also summed up some precautions in the use and maintenance of pneumatic directional control valves, hoping to provide a reference.

1 Requirement for connecting piping

(1) The hard pipe used for connection should be galvanized steel pipe with an anti-rust function. The length of the hose connected between the cylinder and the valve should be kept as short as possible, and the installation should be designed to avoid compromise.

(2) Before connecting the piping, clean up the debris, oil, and dust of various materials in the pipe. It is best to blow it off because when the piping is connected, there will be various debris (such as hidden in the pipe threads) and debris (such as sealing material) into the valve body. When sealing with sealing tape, a part of the length of the threaded end should be left unwrapped with the sealing tape. This length is about 1.5~2 threads, and the sealing tape should be wound in a clockwise direction.

(3) When installing the pipe joint on the reversing valve, care must be taken to ensure that the size of the pipe joint does not interfere with each other. The design of the piping system should take into account the easy disassembly, installation, and disassembly of the reversing valve in case of failure, that is, space for inspection, maintenance, and replacement of new valves should be reserved.

(4) Refer to the relevant information for the torque when installing the piping. The torque should not be too large to cause it to be over-tightened, otherwise, cracks will easily occur at the interface.