Blind valve is a kind of gate valve that cuts off gas medium manually, electrically, pneumatically and hydraulically. Generally divided into electric blind flange valve, hydraulic blind flange valve, pneumatic blind flange valve, closed gate valve and electric open blind flange valve.
The blind valve has three driving devices, including two manual clamping or loosening devices and an electric device for opening or closing the gate. When opening or closing the gate, first loosen the two manual devices, and then start the electric device to achieve the purpose of opening or closing the gate (special note: the electric device is not allowed to open before loosening the two manual devices). After the gate is opened or closed, clamp two manual devices to operate the pipeline.