PVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mm
PVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mm
PVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mm
PVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mm
PVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mm
PVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mm
PVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mm
PVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mm
PVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mm
PVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mm
PVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mm
PVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mm
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PVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mmPVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mmPVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mmPVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mmPVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mmPVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mmPVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mmPVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mmPVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mmPVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mmPVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mmPVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mm

PVC One Way Non Return Flap Check Valve Pipe Fittings ID 20 25 32 40 50 63 mm

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Beschreibung

PVC Non Return Flap Check Valve — Stop Backflow in Water, Drainage & Irrigation Pipe Systems

When a pump shuts off or pressure drops, uncontrolled backflow can contaminate supply lines, flood drainage channels, or damage equipment. Plumbers, irrigation installers, and DIY builders who need a reliable one-way flow solution turn to a PVC flap check valve — a passive, maintenance-light fitting that closes automatically the moment flow reverses.

Each PVC one-way non-return flap check valve is moulded from rigid PVC with a hinged internal flap. Available in inner diameter sizes of 20mm (≈¾"), 25mm (≈1"), 32mm (≈1¼"), 40mm (≈1½"), 50mm (≈2"), and 63mm (≈2½"), and in two finishes — Dark Grey (standard PVC) and Transparent (for visual flow confirmation). The socket ends accept standard PVC pipe of the corresponding ID for solvent-cement jointing.

Typical use cases include residential and commercial cold-water supply lines, drip and sprinkler irrigation return-prevention, pond and aquarium pump outlets, rainwater harvesting downpipes, and grey-water drainage systems where backflow prevention is required without an active valve.

🔗 Compatibility: Fits standard PVC pressure pipe (PN10/PN16) and drainage pipe of matching inner diameter. Solvent-cement socket ends. Not rated for hot water or steam service. Verify pipe OD against your existing fittings before ordering.

✅ Key Features of These PVC Non Return Flap Check Valves

🔄Automatic One-Way Flow Control
The hinged internal flap opens under forward flow pressure and closes by gravity and back-pressure the instant flow stops or reverses — no manual operation required.
📐Six Inner Diameter Options
Available in ID 20, 25, 32, 40, 50, and 63mm to match the most common PVC pipe sizes used in residential and light-commercial plumbing and irrigation.
👁️Transparent or Dark Grey Body
Choose Dark Grey for standard installations, or Transparent to visually confirm flow direction and flap operation without disassembling the line.
🧪Rigid PVC Construction
Moulded from rigid PVC, which resists corrosion, scale build-up, and most common water treatment chemicals — suitable for cold-water and irrigation service.
🔧Solvent-Cement Socket Ends
Both ends are socket-type for standard PVC solvent cement jointing, creating a leak-free, permanent bond compatible with PN10/PN16 pipe systems.
⚖️Low Cracking Pressure
The lightweight flap design opens at low differential pressure, minimising flow restriction in gravity-fed and low-pressure pump systems.

📐 Technical Specifications — PVC Flap Check Valve

Product Type One-Way Non-Return Flap Check Valve
Body Material Rigid PVC (Polyvinyl Chloride)
Flap Material PVC / flexible polymer (varies by size)
Available Inner Diameters 20mm, 25mm, 32mm, 40mm, 50mm, 63mm
Colour / Finish Dark Grey; Transparent
End Connection Type Socket (solvent-cement)
Compatible Pipe Standard Standard PVC pressure pipe PN10/PN16
Max Working Pressure See variant options
Temperature Range Cold water service only (typically 0–45°C / 32–113°F)
Flow Direction One-way (marked on body)
Installation Orientation Horizontal or vertical (upward flow); confirm per size
Quantity per Order 1 piece per variant

❓ Frequently Asked Questions

Which inner diameter should I choose for my pipe?

Match the ID of the valve to the outer diameter (OD) of your PVC pipe — the socket end is sized to accept standard PVC pipe of the corresponding nominal size. For example, a 25mm ID valve fits standard ½" or ¾" nominal PVC pipe depending on your regional standard. Measure your existing pipe OD and cross-reference with your local PVC pipe schedule before ordering.

Can this valve be installed vertically as well as horizontally?

Flap check valves can generally be installed horizontally or vertically with upward flow. Vertical installation with downward flow is not recommended for gravity-flap designs, as the flap may not seal reliably under low back-pressure. Check the flow-direction arrow moulded on the valve body before fitting.

Is this valve suitable for hot water or chemical service?

No. Rigid PVC is rated for cold-water service only — typically up to 45°C (113°F). It is not suitable for hot water, steam, or aggressive chemical media. For hot water applications, consider CPVC or brass check valves. For chemical compatibility, consult a PVC chemical resistance chart for your specific fluid.

What adhesive should I use to join this valve to my pipe?

Use a standard PVC solvent cement (ASTM D2564 or equivalent) with a PVC primer/cleaner. Apply primer to both the pipe end and the socket interior, then apply cement and push the pipe firmly into the socket with a quarter-turn. Allow the joint to cure per the cement manufacturer's instructions before pressurising the line.

What is the difference between the Dark Grey and Transparent versions?

Both versions are functionally identical. The Transparent body allows you to visually inspect the flap position and confirm flow direction without cutting into the line — useful for troubleshooting or monitoring intermittent pump systems. The Dark Grey version is the standard choice for concealed or outdoor installations where UV exposure or aesthetics are a consideration.

How do I know if the valve is working correctly after installation?

With the Transparent variant, you can observe the flap opening during forward flow and closing when the pump stops. For Dark Grey variants, confirm correct operation by shutting off the pump and checking that no backflow occurs at the upstream side. A slight click or thud when the pump stops is normal — it indicates the flap has closed. Persistent backflow suggests the flap seat may have debris; flush the line and inspect.

Can I use this valve in an irrigation or pond pump system?

Yes. PVC non-return flap check valves are widely used on pond pump outlets, drip irrigation mains, and sprinkler system return lines to prevent siphoning and backflow when the pump cycles off. Ensure the valve ID matches your irrigation pipe size and that the working pressure does not exceed the valve's rated pressure for your chosen size.

🛒 Select your Inner Diameter and Colour above, then add to cart.

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