Abstract: A mechanically actuated pinch valve having a longitudinally extending flexible valve body with an inlet and an outlet and frame members extending along either side of the valve. Side plates are pivotally attached at each side frame. A lower pinch bar or roller extends between the side plates at the lower side of the valve body. A pair of arms are pivotally attached to the side plates and carry an upper pinch bar. The valve is actuated by means of a lever attached to the arms which simultaneously cause the pivot plates to rotate while bringing the upper pinch bar into compressing engagement with the valve body. In other embodiments the actuator mechanism may include a compound linkage or a lead screw for improved control and better mechanical advantage.