Flap valve

The flap valve features a sturdy and compact overall structure, consisting of a high-strength valve frame, reinforced thickened door panel, rust-proof stainless steel hinge shafts, high-elasticity wear-resistant sealing strips, and optional counterweight or floating box auxiliary structures. Available in multiple premium materials including ductile iron, carbon steel, 304/316 stainless steel and fiberglass, the valve resists water flow impact, corrosion and aging without deformation. It can operate stably for a long time under harsh working conditions such as outdoor exposure, underwater immersion, humid corrosion and fluctuating high and low temperatures.

Detail

Parameters

Flap valve, also known as water-stop flap valve or tide valve, is a hydraulic automatic one-way water stop valve specially designed for

municipal, water conservancy and environmental drainage projects. It is mainly installed at the outlet ends of pipelines, pump

stations, culverts and channels, acting as the core supporting equipment to prevent backflow of drainage systems.

Requiring no external power supply and manual operation, the valve opens and closes automatically relying on water pressure difference and self-weight. It guarantees smooth forward drainage and tightly closes to stop water under reverse pressure, effectively avoiding

backflow of tidal water, river water and sewage.With a simple, sturdy structure, stable operation, zero energy consumption and

maintenance-free performance, the valve adapts to various complex water quality and outdoor working conditions. It is widely used in

municipal drainage, sewage treatment, water conservancy drainage, coastal flood control, industrial water supply and drainage projects.

Product Core Advantages

✅ Automatic hydraulic operation with zero energy consumption

Requires no power supply, air source, motor or electronic control components. It operates automatically relying on water pressure difference and gravity, and works normally even during power outages or equipment shutdowns. Zero operating energy consumption avoids

failure risks of electric-controlled devices.

✅ Excellent backflow prevention and reliable water tightness

Adopts embedded high-elastic rubber sealing structure for tight closure. The sealing performance becomes stronger under reverse water pressure, effectively

preventing backflow of tidal water, river water and sewage with ultra-low leakage, fully protecting pipe networks, pump stations

and equipment.

✅ Low flow resistance and high drainage efficiency

Full-open straight-through design brings smooth water flow with almost no pressure loss. It improves pump drainage efficiency, reduces

pump operating load and saves system energy consumption.

✅ Robust structure suitable for harsh working conditions

Integrally formed high-strength valve body with reinforced structure resists water impact and deformation. It is waterproof, ageing-resistant and corrosion-resistant, ensuring long-term stable operation in outdoor, underwater, high-low temperature and humid

environments.

✅ Maintenance-free and low operating cost

Simple mechanical structure without vulnerable electronic parts. No professional debugging or daily maintenance is required except

regular cleaning of floating debris, greatly reducing later labor and maintenance costs.

✅ Wide adaptability and easy installation

Supports flange connection, wall embedding and bolt fixing. Complete round and rectangular sizes are available with customized options, fitting various water outlets of pipelines, culverts, channels and pump stations.

✅ Noise and shock reduction for structural protection

Optional counterweight and floating box structures slow down closing impact, reduce water hammer vibration and operating noise, and

avoid long-term structural damage to valves, pipelines and walls.

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