Cast iron sluice gates are a type of small flat gate widely used in water intake and conveyance, municipal construction, water supply and drainage, and farmland irrigation projects. They are typically installed at the inlet of canals and culverts, serving as operating gates to regulate flow and control water levels, or as maintenance gates to close and prevent water from entering.

Wrought iron gates come in square and round shapes. Generally, they consist of two parts: the gate leaf and the gate frame. The material for both the gate body and the frame is cast iron, typically produced through whole casting and processing.

The door bodies typically feature a panel and reinforced rib structure, with panels available in flat or arched designs. The doors are generally cast and machined as a whole, but larger sizes may be assembled in modular sections. A solid metal waterstop is commonly used on the door bodies, serving as a support slider. The metal waterstop is secured 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 gate and the foundation, equivalent to the buried height section of a flat steel gate. It consists of two parts: the lower door frame and the upper guide rail. The lower door frame is typically cast and machined as a whole, while the guide rail can be connected to the door frame with bolts (screws) or cast as an integral part with the lower door frame. When the door is opened to a high position, the top of the guide rail should be higher than the horizontal centerline of the door body.