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

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

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Beschreibung

UPVC Non-Return Check Valves — Flap & Ball Design to Stop Backflow in Cold-Water & Irrigation Systems

Backflow in a pipe system can contaminate clean water supplies, flood pump chambers, and damage equipment in seconds. Plumbers, irrigation engineers, and DIY homeowners who need a dependable, maintenance-free solution to prevent reverse flow will find these UPVC non-return check valves deliver reliable one-way flow control across a wide range of pipe sizes.

Each valve combines a flap and ball check mechanism inside a rigid UPVC body, allowing flow freely in one direction while the flap and ball seat automatically under reverse pressure to block backflow. Interior diameters span 20mm (DN15) through 110mm (DN100), covering nine standard metric pipe sizes used in residential plumbing, agricultural irrigation, pond and water-feature circulation, and light-commercial drainage. The UPVC construction resists corrosion from chlorinated water, fertilizer solutions, and mild chemicals.

Typical applications include pump outlet protection on submersible and surface pumps to prevent drain-back when the pump stops; backflow prevention on irrigation zone supply lines; one-way flow control on rainwater harvesting tank inlets; and non-return protection on drainage laterals where reverse surges could cause flooding. Long-tail use cases such as "UPVC check valve 50mm irrigation pump outlet", "non-return flap valve 32mm cold water pipe", and "ball check valve 63mm drainage backflow prevention" are all well served by this range.

🔗 Compatibility: Designed for standard metric UPVC / PVC-U pipe (20mm–110mm ID). Installs in-line using solvent-weld or threaded connections depending on end configuration. Suitable for cold-water supply, irrigation, and gravity drainage. Not suitable for hot-water supply, steam, or compressed-air systems.

✅ Key Features of These UPVC Non-Return Check Valves

  • 🔄Dual Flap & Ball Check Mechanism — The combined flap and ball design provides two stages of backflow resistance, seating reliably under reverse pressure to prevent drain-back, contamination, and reverse surge damage.
  • 📐Nine Sizes: DN15 to DN100 — Available in 20mm (DN15), 25mm (DN20), 32mm (DN25), 40mm (DN32), 50mm (DN40), 63mm (DN50), 75mm (DN65), 90mm (DN80), and 110mm (DN100) to match the most common metric pipe sizes in residential and light-commercial systems.
  • 🛡️Corrosion-Resistant UPVC Body — Unplasticized PVC does not rust, pit, or degrade from chlorinated water, fertilizer solutions, or mild cleaning agents, making these valves suitable for both above-ground and buried installations.
  • 🔧Passive Operation — No Power Required — The check mechanism operates entirely on flow pressure and gravity, with no electrical components, actuators, or manual intervention needed during normal service.
  • 💧Low Cracking Pressure — The valve opens at low forward-flow pressure, minimizing head loss in the system while still seating firmly under reverse pressure to block backflow effectively.
  • 🌡️Cold-Water Service Rated — Optimized for cold-water supply, irrigation, pond circulation, and drainage applications where operating temperatures remain below approximately 60 °C (140 °F).

📐 Technical Specifications — UPVC Non-Return Check Valves

Material UPVC (Unplasticized Polyvinyl Chloride)
Valve Type Non-Return Check Valve (Flap & Ball)
Flow Direction One-way (unidirectional)
Interior Diameter Range 20mm – 110mm (DN15 – DN100)
Available Sizes 20mm (DN15), 25mm (DN20), 32mm (DN25), 40mm (DN32), 50mm (DN40), 63mm (DN50), 75mm (DN65), 90mm (DN80), 110mm (DN100)
Connection Type See variant options
Pressure Rating See variant options
Cracking Pressure See variant options
Temperature Range 0 °C – 60 °C (32 °F – 140 °F)
Body Color Grey (UPVC standard)
Operation Passive (no power required)
Pack Quantity 1 piece per order

❓ Frequently Asked Questions

What is a non-return check valve, and how does it work?

A non-return (check) valve allows fluid to flow freely in one direction and automatically blocks flow in the reverse direction. This valve uses a combined flap and ball mechanism: when forward flow pressure is applied, the flap opens and the ball lifts to allow flow. When flow stops or reverses, the flap closes and the ball drops back onto its seat under gravity and reverse pressure, creating a seal that prevents backflow.

How do I choose the correct size for my pipe?

Match the valve's interior diameter (ID) to the nominal bore of your pipe. The variant names show both the metric ID and the DN (nominal diameter) equivalent: 20mm = DN15, 25mm = DN20, 32mm = DN25, 40mm = DN32, 50mm = DN40, 63mm = DN50, 75mm = DN65, 90mm = DN80, 110mm = DN100. If unsure, measure the pipe's inner diameter or check the pipe's markings for its nominal size.

Can I install this valve in any orientation?

For flap and ball check valves, the recommended installation orientation depends on the specific model. Horizontal installation is generally supported, and vertical installation with upward flow is also common for pump outlet protection. Vertical installation with downward flow may reduce seating reliability on some designs. Check the valve body for a flow-direction arrow and install accordingly. Contact us to confirm orientation requirements for your specific size.

Is this valve suitable for use on a pump outlet to prevent drain-back?

Yes. Preventing drain-back when a pump stops is one of the most common applications for this type of check valve. Install the valve immediately downstream of the pump outlet, with the flow arrow pointing away from the pump. When the pump stops, the valve seats automatically to hold the water column in the pipe and protect the pump from reverse-spin damage.

Can these valves be used for buried or underground installations?

UPVC is chemically resistant to soil acids, fertilizers, and groundwater, making it suitable for buried installations. Ensure the valve is accessible for inspection if required by local codes, and follow standard bedding and burial-depth guidelines for your region. Avoid installations where the valve body could be subjected to direct point loads from rocks or heavy equipment.

What is the difference between a flap check valve and a ball check valve, and why does this product use both?

A flap check valve uses a hinged disc that swings open under forward flow and closes under reverse pressure. A ball check valve uses a ball that lifts off its seat under forward flow and drops back to seal under reverse pressure. Combining both mechanisms in a single body provides redundancy — if one element does not seat perfectly due to debris or wear, the other continues to provide backflow protection, improving overall reliability.

Can I use this valve for irrigation systems and garden water lines?

Yes. These UPVC non-return check valves are well suited for irrigation zone supply lines, drip-system pump outlets, and garden water distribution headers where backflow prevention is required. They are compatible with standard metric UPVC pipe used in most residential and light-commercial irrigation setups. Select the size that matches your pipe's nominal bore and confirm the connection type before ordering.

🛒 Select your size (ID) above, then add to cart.

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