FRP Flap Valve,also known as Fiberglass Reinforced Plastic flap valve,is an automatic gravity check valve made of high-strength fiberglass reinforced plastic composite material.It realizes automatic opening and closing only by water pressure difference,which allows forward water flow freely and effectively prevents backflow of river water,tide water and sewage.With outstanding corrosion resistance and lightweight property,it is widely used in drainage and environmental protection projects.

Working Principle

The valve operates without any external power,manual operation or control device.

When upstream water flows forward,the hydraulic pressure pushes the FRP flap open to achieve smooth water drainage.

When upstream flow stops,or downstream water level rises,flood backflow and tide surge happen,the flap will automatically close tightly under gravity and reverse water pressure,forming a tight seal to completely block reverse flow and protect pipelines,pump stations and drainage systems.

Main Materials

Valve Body:High-quality FRP(Fiberglass Reinforced Plastic),integral molded molding,high strength and toughness.

Flap Disc:Molded FRP plate with multi-layer fiberglass laminate,impact resistant and non-deformable.

Hinge&Fasteners:304/316L stainless steel,anti-corrosion,flexible rotation and no blocking.

Sealing Ring:High elastic EPDM rubber seal,excellent watertight performance,aging resistance and wear resistance.

Key Features

Perfect Corrosion Resistance

Completely resistant to acid,alkali,salt,sewage,seawater and various chemical corrosive media.No rust,no corrosion,no aging degradation,far superior to metal valves.

Ultra Light Weight

Much lighter than cast iron and stainless steel valve,greatly reduces transportation cost,hoisting difficulty and installation workload.

High Structural Strength

Integrated mold pressing process,good compressive and impact resistance,stable performance under long-term underwater impact.

Low Flow Resistance

Smooth internal channel,small water head loss,efficient water discharge with low opening pressure.

Zero Maintenance

No painting,no anti-rust treatment,no frequent maintenance required throughout service life.

Weather&UV Resistance

Stable performance under long-term outdoor exposure,sunlight and high humidity environment.

Non-conductive&Anti-theft

Non-metallic material,no electromagnetic induction,no residual value and anti-theft.

Technical Specifications

Body Material:FRP/Fiberglass Reinforced Plastic

Seal Material:EPDM Rubber

Hinge&Hardware:Stainless Steel 304/316L

Size Range:DN50~DN3000,circular and rectangular custom sizes available

Working Pressure:PN6,PN10

Connection Type:Flanged connection,wall-mounted,pipeline end installation

Working Temperature:-20℃~90℃

Applicable Medium:Fresh water,sewage,seawater,acidic and alkaline wastewater