Flap gate It can realize automatic control of water level, which is mainly used to intercept or discharge water flow in reservoirs, rivers, reservoirs, etc.
Now the widely used flap gate is the hydraulic automatic flap gate. Its working principle is lever balance and rotation. Specifically, the hydraulic automatic flap gate uses the mutual balance of hydraulic power and gate weight, and achieves the purpose of regulating water level by adding damping feedback system: when the upstream water level rises, the gate gradually opens to discharge around the "horizontal axis"; On the contrary, when the upstream water level drops, the gate will gradually close to store water, so that the upstream water level will always be kept within the design requirements. For example, the roller link flap gate is a kind of gate with double fulcrum and connecting rod. It is composed of panel, outrigger, buttress, roller, connecting rod and other components. According to the change of water level of the gate, the opening and closing of the gate can be controlled automatically by hydraulic action. When the upstream flow increases, the upstream water level of the gate rises, and the moment of hydrodynamic pressure to fulcrum is greater than that of gate weight and various damping, the gate will automatically open to a certain angle until the moment of hydrodynamic pressure to fulcrum is equal to that of gate weight fulcrum under this inclination angle, reaching a new balance under the flow. When the flow rate is constant, the opening angle remains the same. When the upstream flow is reduced to a certain extent, the moment of the gate weight to the fulcrum is greater than that of the hydrodynamic pressure and various kinds of damping, the hydraulic automatic flap gate can automatically close to a certain angle, thus reaching a new balance under the flow.