Hydraulic Automatic Flap Gate

The hydraulic self-operating flip gate is a water control facility that achieves automatic regulation through the balance of hydraulic force and self-weight. It is primarily used in reservoirs, rivers, and other locations to block or discharge water flow, featuring a simple structure and low cost.
Core Principle
It employs a lever balance and rotation mechanism, controlling the gate’s tilt angle through changes in the moment of water flow pressure and gate weight. When the upstream water level rises, the gate gradually opens around the pivot to release flow; when the water level drops, it automatically closes to store water, maintaining the set water level range.
Structural Composition
It mainly consists of components such as the panel, support legs, abutments, and rollers/links. For example, the roller-link mechanism reduces vibration through dual pivots and works in conjunction with a trapezoidal practical weir to improve the flow coefficient.
Application and Development
Since China’s independent research and development in the 1960s, it has been gradually optimized into structures like the multi-pin hinge type and roller-link type. In 1983, the pre-tilt angle design of the panel resolved the minor opening slapping issue, and subsequent slider-type gates further enhanced performance. They are widely used in flood control, irrigation, and other fields.
Technical Features
Automatic Regulation: No manual operation required; it opens and closes automatically based on water level.
Applicable Scenarios: Small to medium-sized hydraulic engineering projects and remote unattended locations.
Maintenance Cost: Simple structure, reliable operation, and low cost.
The current market reference price starts at 5,000 RMB per unit, suitable for water level regulation in hydraulic facilities such as reservoirs and rivers.