CF-1 series pneumatic pinch valve is a lever extruded, cylinder driven, flange connected pinch valve. Its working principle is as shown in the figure. The cylinder drives the upper and lower clamping crossbars to squeeze the inner bushing, so that the inner bushing is clamped and the valve is closed; When the cylinder is driven reversely, the inner bushing is opened and the valve is smooth; The whole clamping device is suspended and installed on the inner bushing. During the clamping process, the inner bushing is always kept at the axis position, so that the force on the circumference of the inner bushing is equal, effectively extending the life of the inner bushing.