Cast iron sluice gates are small flat gates widely used in water abstraction and conveyance, municipal construction, water supply and drainage, and agricultural irrigation projects. They are typically installed at the inlets of channels and culverts, serving as working gates to regulate flow and control water levels, or as maintenance gates to close and prevent water from flowing through the orifices.

Cast iron gates come in square and round shapes. Generally, cast iron gates consist of two parts: the gate leaf and the gate frame. Both the gate body and frame are made of cast iron, typically cast and machined as a whole.

The door bodies typically feature a panel and reinforced rib structure, with panels available in flat or arched designs. The door bodies are generally cast and machined as a whole, but larger sizes may be composed of modular sections. An integrated metal waterstop is commonly used on the door bodies, serving as a support for sliding blocks. The metal waterstop is securely fastened to the door body with countersunk screws made from the same material, with the screw heads and waterstop working surface precision-machined together. Larger sizes may also utilize "P"-shaped rubber waterstops.

The door frame serves as the connecting component between the cast iron shutter gate and the foundation, equivalent to the buried height section of a flat steel shutter gate. The door frame consists of two parts: the lower door frame and the upper guide rail. The lower door frame is generally cast and machined as a whole, while the guide rail can be connected to the door frame with bolts (screws) or cast as a whole with the lower door frame. When the door body is opened to a high position, the top of the guide rail should be above the horizontal center line of the door body.