Mechanical valve means that the movement of the valve core is controlled by machinery, such as manual reversing valve, motorized reversing valve, etc. Pneumatic directional valve means that the valve core action is controlled by gas pressure, such as shuttle valve, quick exhaust valve, etc. Some valves are pneumatic and motorized. For example, the left and right positions of a pneumatic reversing valve are pneumatically controlled, and the middle position is controlled by a spring. The working mode of the mechanical valve is that the exhaust port is located on the body, which facilitates the installation of a muffler, reduces noise and pollution;the external force required for reversal of the M5B, M5R, and M5L series is provided by an external mechanism and can be used for position detection or travel switch;M5C, M5D , M5Y, M5PF, M5PM, M5PP, M5PL, M5HS series are manually operated, with a variety of structural shapes of control heads to facilitate use under different conditions;with a sliding column structure, the control force is not affected by working pressure (that is, there is no back pressure effect). The inner ring is sealed, with good sealing performance and flexible reversal;no need for lubrication;6. Multi-position installation, easy to install and use;M5C, M5D, M5Y, M5R, M5L series control heads are made of metal, with long life, more reliable and stable.