Zero position indicating device of valve

A zero position indicating device of a valve belongs to the technical field of zero position indicating device structures of valves. A zero position indicating device of the valve needs to accurately control the closing position of a gate plate to ensure that the valve closing action is accurate and in place every time, a servo motor is generally adopted in the prior art, the requirements for the maintenance and use environment are high, and the use cost is high, and the valve comprises a valve shell, a lead screw, a trigger plate, a detection switch, a transmission nut and a driving device. The lead screw is arranged in the valve shell and penetrates through the center of the transmission nut, the transmission nut is in threaded connection with the lead screw, one side of the lead screw is connected with the trigger plate, and a detection switch is arranged on the inner wall of the valve shell and corresponds to the trigger plate. The transmission nut is rotationally arranged in the valve shell and connected