Cast iron gate valve length 3.5 meters; height 3.0 meters;

Cast iron sluice gates are critical equipment in water conservancy projects for controlling water flow. Their structural design balances strength, sealing performance, and operational convenience, consisting of the following core components that work together to achieve water retaining, drainage, and flow regulation functions:

1. Gate Leaf

The gate leaf is the core load-bearing component of the cast iron sluice gate, directly contacting water flow and bearing water pressure.

Material: Typically made of high-strength gray cast iron (e.g., HT200, HT250) or ductile iron. These materials offer excellent compressive strength, wear resistance, and corrosion resistance, enabling them to withstand long-term water scouring and pressure.

Structure: Mostly rectangular or circular flat-plate structures. To meet load requirements, reinforcing ribs are designed inside the plate to enhance overall rigidity and prevent deformation under water pressure. Some large gate leaves also have pre-drilled connection holes for docking with lifting rods or hoist components.

Function: Controls the size of the flow cross-section through lifting and lowering movements, achieving water retaining (blocking water when closed) or drainage (releasing water when open).

2. Gate Frame

The gate frame serves as the supporting skeleton of the gate, fixing the gate leaf and connecting to the foundation structure, acting as the "installation benchmark" of the gate.

Material: Consistent with the gate leaf, cast from cast iron to ensure material compatibility, reducing seal failure caused by differences in thermal expansion and contraction.

Structure: A frame-shaped structure with guide grooves (or guide surfaces) on the inner side, along which the gate leaf slides during lifting. The outer side has pre-reserved anchor bolt holes for fixing to concrete foundations or steel brackets. Some gate frames also feature water stop seats (seal grooves) for installing sealing components.

Function: Provides stable movement guidance for the gate leaf, distributes the water pressure transmitted by the gate leaf to the foundation, and ensures sealing when the gate is closed through cooperation with seals.

3. Hoist Mechanism

The hoist mechanism is the power device driving the gate leaf to lift and lower, determining the gate's operation mode and efficiency.

Types: Classified by power source into manual hoists (e.g., hand-cranked screw type, gear type) and electric hoists (e.g., electric screw type, winch type). Small gates mostly use manual types, while large gates or remote control scenarios adopt electric types.

Structure: Core components include a power source (handle, motor), transmission mechanism (screw, gear, chain, or steel cable), and limit device (preventing over-travel of the gate leaf). For example, screw hoists drive the gate leaf up and down through screw rotation, featuring a simple structure and precise positioning.

Function: Provides driving force to realize smooth lifting of the gate leaf, controls the gate's opening degree, and meets different flow regulation needs.

4. Sealing Components

Sealing components are key to ensuring the gate's water-stopping performance, eliminating gaps between the gate leaf and frame to prevent water leakage.

Material: Commonly water-resistant rubber (e.g., nitrile rubber, neoprene) or metal (e.g., copper sheets, stainless steel sheets). Rubber seals are suitable for medium and low-pressure scenarios, while metal seals are used in high-pressure or high-temperature environments.

Structure: Mostly strip-shaped or frame-shaped, fixed to the water stop seat of the gate frame or the edge of the gate leaf via bolts. Their cross-sections are designed as "lip-shaped" or "P-shaped" to tightly fit the contact surface when the gate is closed, utilizing their own elasticity.

Function: Blocks water seepage channels between the gate leaf and frame, ensuring water-stopping effect when the gate is closed, and reducing water waste or scouring of downstream structures.

5. Connecting Parts

Connecting parts assemble components into a whole and fix the gate to the foundation, ensuring structural stability.

Main Components: Include anchor bolts (fixing the gate frame to the concrete foundation), connecting bolts (connecting the gate leaf to the lifting rod, and the hoist to the gate frame), and pins (for movable joint connections).

Material: Mostly high-strength carbon steel or stainless steel, with anti-rust treatment (e.g., galvanizing, painting) on the surface to prevent corrosion from long-term water immersion.

Function: Ensure firm connection of all components, transmit loads (e.g., water pressure, hoisting force), and prevent loosening or displacement of the gate during operation.

6. Guide Rails

Guide rails are guiding components assisting the smooth lifting of the gate leaf. Some gates integrate guide rails into the gate frame, while large gates may have separate ones.

Material: Cast iron or steel, with mechanically polished surfaces to ensure smoothness and reduce friction resistance during gate leaf lifting.

Structure: Installed parallel to the movement direction of the gate leaf, cooperating with the guide grooves on the gate leaf's side to limit lateral deviation of the gate leaf.

Function: Guide the gate leaf to lift along a fixed trajectory, avoiding jamming or tilting caused by water flow impact or installation deviations, and ensuring smooth operation.

7. Lifting Rod

The lifting rod is the transmission component connecting the gate leaf and the hoist, responsible for transmitting the hoist's power to the gate leaf.

Material: High-quality carbon steel or stainless steel. The rod body must have sufficient strength and straightness, and some are designed with threaded sections to cooperate with the hoist's screw.

Structure: Mostly solid round rods or hollow tubes, with the upper end connected to the hoist's transmission mechanism and the lower end fixed to the gate leaf via flanges or pins.

Function: Converts the rotational (or linear) motion of the hoist into the vertical lifting motion of the gate leaf, acting as a "bridge" for power transmission.