Square gate , which is used in water project, is composed of gate, body, stem and actuator . Sealing principle is that rubber which is installed in the surface of gate and inner of body ( welding into channel steel) .This kind of valve is cast iron valve and is single way to prevent water . It's used in swage , water pool to control water's level . With simple structure, simple process, light weight, convenience installation , it's wildly used in water conservancy .According to customers' requirements, it can be equipped with manual , pneumatic , electric and electro-hydraulic actuators etc, to control .