UPVC One Way Non Return Flap Check Valve Pipe Fittings I.D 20 25 32 40 50 63mm
UPVC One Way Non Return Flap Check Valve Pipe Fittings I.D 20 25 32 40 50 63mm
UPVC One Way Non Return Flap Check Valve Pipe Fittings I.D 20 25 32 40 50 63mm
UPVC One Way Non Return Flap Check Valve Pipe Fittings I.D 20 25 32 40 50 63mm
UPVC One Way Non Return Flap Check Valve Pipe Fittings I.D 20 25 32 40 50 63mm
UPVC One Way Non Return Flap Check Valve Pipe Fittings I.D 20 25 32 40 50 63mm
UPVC One Way Non Return Flap Check Valve Pipe Fittings I.D 20 25 32 40 50 63mm
UPVC One Way Non Return Flap Check Valve Pipe Fittings I.D 20 25 32 40 50 63mm
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UPVC One Way Non Return Flap Check Valve Pipe Fittings I.D 20 25 32 40 50 63mmUPVC One Way Non Return Flap Check Valve Pipe Fittings I.D 20 25 32 40 50 63mmUPVC One Way Non Return Flap Check Valve Pipe Fittings I.D 20 25 32 40 50 63mmUPVC One Way Non Return Flap Check Valve Pipe Fittings I.D 20 25 32 40 50 63mmUPVC One Way Non Return Flap Check Valve Pipe Fittings I.D 20 25 32 40 50 63mmUPVC One Way Non Return Flap Check Valve Pipe Fittings I.D 20 25 32 40 50 63mmUPVC One Way Non Return Flap Check Valve Pipe Fittings I.D 20 25 32 40 50 63mmUPVC One Way Non Return Flap Check Valve Pipe Fittings I.D 20 25 32 40 50 63mm

UPVC One Way Non Return Flap Check Valve Pipe Fittings I.D 20 25 32 40 50 63mm

HomeDIYer
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By HomeDIYer®

Price:
$13.67 USD
Stock:
In stock (500 units), ready to be shipped

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Description

UPVC Non Return Flap Check Valve — Stop Backflow in Plastic Pipe Systems

Backflow contamination and reverse-flow damage are persistent headaches for irrigation installers, pool plumbers, and drainage engineers working with plastic pipe systems. The UPVC one-way non return flap check valve is engineered to solve exactly that — allowing flow in one direction only, automatically closing the moment pressure reverses.

Each valve is machined from rigid unplasticized PVC (UPVC), offering excellent resistance to chlorine, mild acids, and common irrigation chemicals. The internal flap mechanism seats firmly under reverse pressure without requiring springs or external actuators. Available in six inner-diameter sizes — 20mm (≈0.79"), 25mm (≈0.98"), 32mm (≈1.26"), 40mm (≈1.57"), 50mm (≈1.97"), and 63mm (≈2.48") — to match standard metric PVC pipe schedules.

Typical applications include residential and commercial drip irrigation backflow prevention, swimming pool and spa return-line protection, rainwater harvesting tank inlet control, and gravity-fed drainage systems where reverse siphoning must be blocked. The lightweight UPVC body makes it a practical choice for above-ground and in-wall installations where metal valves would add unnecessary load.

🔗 Compatible with standard metric UPVC/PVC pressure pipe in I.D sizes 20, 25, 32, 40, 50, and 63mm. Suitable for cold water, irrigation fluids, and mild chemical solutions within rated pressure limits. Not recommended for hot water lines above 60°C (140°F).

✅ Key Features of These UPVC Non Return Flap Check Valves

  • 🔄One-Way Flap Mechanism — The internal flap opens freely under forward flow and seals automatically when pressure reverses, preventing backflow without manual intervention.
  • 🧪Chemical-Resistant UPVC Body — Rigid unplasticized PVC resists chlorine, fertilizer solutions, mild acids, and UV exposure, making these UPVC check valves suitable for outdoor irrigation and pool plumbing.
  • 📐Six Size Options — Available in I.D 20, 25, 32, 40, 50, and 63mm to match the most common metric PVC pipe schedules used in residential and light commercial systems.
  • ⚖️Lightweight Construction — The UPVC body is significantly lighter than brass or cast-iron check valves, reducing stress on pipe joints and simplifying overhead or in-wall installation.
  • 🔧Tool-Free Flap Operation — No springs, solenoids, or external actuators required. The gravity-assisted flap resets automatically, minimizing maintenance requirements over the valve's service life.
  • 💧Low Cracking Pressure — The flap design opens at low differential pressure, ensuring minimal flow restriction in gravity-fed and low-pressure irrigation systems.

📐 Technical Specifications — UPVC Flap Check Valve

Material UPVC (Unplasticized PVC)
Valve Type One-Way Non Return Flap Check Valve
Available Inner Diameters 20mm / 25mm / 32mm / 40mm / 50mm / 63mm
Connection Type Solvent weld socket (slip fit)
Max Working Pressure See variant options
Working Temperature Range 0°C – 60°C (32°F – 140°F)
Fluid Compatibility Cold water, irrigation solutions, mild chemicals
Actuation Gravity / differential pressure (no external actuator)
Color Grey
Quantity per Order 1 piece

❓ Frequently Asked Questions

Which size UPVC check valve do I need for my pipe?

Match the valve's inner diameter (I.D) to your existing pipe's inner diameter. Common metric PVC pipe sizes are 20mm, 25mm, 32mm, 40mm, 50mm, and 63mm. If you are unsure, measure the inside bore of your pipe or check the pipe's printed specification. Using a valve one size too small will restrict flow; one size too large will not seal correctly.

Can this valve handle irrigation fertilizer or chemical solutions?

Yes. UPVC is resistant to a wide range of fertilizer solutions, mild acids, and chlorinated water commonly used in drip and sprinkler irrigation. Always verify chemical compatibility for concentrated or aggressive solutions before installation.

Is this check valve suitable for hot water systems?

No. This valve is rated for cold water and ambient-temperature fluid applications up to approximately 60°C (140°F). For hot water or steam lines, a metal-bodied check valve rated for higher temperatures is required.

How is the valve installed — does it need solvent cement?

The valve uses a standard solvent weld (slip) socket connection. Apply UPVC solvent cement to the pipe end and the valve socket, push together with a quarter-turn, and hold for 30 seconds. Allow full cure time per the cement manufacturer's instructions before pressurizing the line.

Will the flap seal completely under reverse pressure?

Under normal operating conditions the gravity-assisted flap seats firmly against the valve body when reverse pressure is applied, providing a reliable one-way seal. For applications requiring zero-leakage shut-off under sustained high back-pressure, a spring-loaded or dual-plate check valve may be more appropriate.

How do I choose between a flap check valve and a spring check valve?

Flap check valves rely on gravity and differential pressure to close, making them ideal for horizontal or slightly inclined pipe runs with moderate flow velocities. Spring check valves close faster and work in any orientation, including vertical downward flow. For low-pressure gravity irrigation and drainage, the flap type is typically sufficient and offers lower flow resistance.

Can I use this valve on a swimming pool return line?

Yes. UPVC flap check valves are commonly used on pool and spa return lines to prevent back-siphoning when the pump is off. Ensure the selected I.D matches your return pipe bore and that the valve is installed with flow direction aligned to the arrow or flap orientation marked on the body.

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