CF-2 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 fixed on the valve body. When closing, use the reverse prying mechanism to squeeze the upper and lower levers to the middle of the inner bushing, so that the inner bushing is 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.