EF series electric pinch valve is a lever extrusion type, automatic motor system driven, flanged pinch valve. Its working principle is as shown in the figure. The servo motor or stepping motor drives the upper and lower clamping crossbars to squeeze the inner ushing, so that the inner bushing is clamped and the valve is closed; When the motor reverses, the inner bushing opens and the valve is smooth. The precise control of the motor through the computer system can realize the precise control of the valve opening.