河阀的启闭件是闸板。河板的运动方向与流体方向相蚕直，从而开启或者关闭阀门。广泛 适用于石油ft!,火力发电厂、油品、水蒸气管路上或娜管踣中介质的启闭皿 The opening and closing parts of gate valve is gate. Motion dirBction of gate is perpendicular to the direction of fluid for opening and closing the valve. It is widely used in petrochemical industry, thermal power plant and the oil or steam pipeline, as an opening and closing device to connect or disconnect the medium in pipeline.