1.Hydraulic Automatic Opening & Closing
Opens and closes automatically by the water level difference inside and outside the pipeline. No motor or manual operation required, achieving zero-energy operation.
2. One-Way Water Sealing
Only allows water inside the pipe to flow outward. It forms an automatic tight seal under high external water levels to prevent backflow of river water and rainwater.
3. Power-Free Operation
Free of any electrical and driving components. It can reliably prevent backflow even during power outages or pump station malfunctions, delivering outstanding flood control stability.
4. Simple Structure
Consists of only four core parts: gate leaf, gate frame, hinges and rubber sealing strips. Fewer components mean low failure rate.
5. Multi-Scenario Installation
Compatible with multiple mounting methods including pipeline flange connection, concrete water outlets and external mounting on channel side walls.
6. Low-Noise Opening & Closing
Driven by hydraulic pressure and self-weight. No gears or motors during operation, resulting in zero vibration and noise.
7. Multi-Media Compatibility
Suitable for conveying rainwater, domestic sewage, clear river water and mild neutral industrial wastewater.
8. Multiple Anti-Corrosion Materials Available
Optional materials: cast iron, anti-corrosion carbon steel, 304 / 316 stainless steel and FRP, suitable for corrosive water environments.
9. Low Maintenance Cost
Without transmission or electrical accessories. Routine inspection only covers hinge rust and sealing strip aging.
10. Low-Temperature Weather Resistance
No electronic parts to malfunction under low temperatures. Simple thermal insulation enables stable performance under winter icing conditions.
11. Low Opening Resistance
A slight internal water pressure can push the gate open, avoiding pipeline water accumulation even under small drainage flow rates.
12. Wide Engineering Versatility
Widely applied in municipal pipe networks, flood drainage pump stations, residential sewage systems, sponge city projects and water conservancy channel works.
Item | Technical Index |
Product Type | Round / Square Flap Gate |
Nominal Diameter & Opening Size | DN300–DN3000; Square opening: 300×300mm–3000×3000mm, non-standard customization available |
Main Body Material | Cast Iron / Carbon Steel / Stainless Steel |
Sealing Parts | Anti-aging rubber waterstop strip, extrusion sealing structure |
Seepage Rate under Closed State | ≤0.04L/(s·m) |
Operating Water Head Range | 0–30m |
Opening Starting Pressure | Minimum opening water level differential: 0.08–0.12m |
Connection & Installation Method | Flange connection, pre-embedded concrete casting |
Hinge Structure | External movable hinge |
Anti-corrosion Treatment | Overall sand blasting for rust removal + anti-corrosion paint coating |
Impact Resistance | Resists impact of floating debris in flood season; no plastic deformation on gate leaf |
Applicable Media | River water, rainwater, domestic sewage, mild industrial wastewater |
Ambient Temperature | -30℃ ~ 65℃ for outdoor operation |
Designed Service Life | Gate service life ≥ 25 years |
Opening Angle | Max automatic opening angle: 30°–90° |
