When compressed air or liquid (with a minimum pressure of 2 bar) enters the pneumatic clamp valve body, the special internal liner with high resilience is compressed. The structure of the valve body ensures the lip free closing of the inner bushing. This ensures the absolute and reliable turn off of the medium flow, and at the same time, maximizes the service life of the inner bushing. In this case, the pneumatic clamp valve is closed, so that the media flow can be turned off one hundred percent. The maximum working pressure is determined according to the nominal diameter, and the range is 2-6 bar. When the compressed air or liquid is interrupted, the special inner bushing will completely open the valve due to the action of resilience or restoring force and the effect of medium pressure.