UPVC One Way Non Return Flap Check Valve Plumbing Fittings Pipe Tube Connector

Name: UPVC One Way Non Return Flap Check Valve Plumbing Fittings Pipe Tube Connector
Brand: HomeDIYer
Price: 17.94 USD
Availability: InStock

Size: 20mm (DN15)

Amount: 1 Pcs

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$17.94 USD

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UPVC Non Return Flap Check Valve — Stop Backflow Without Manual Intervention

When a pump shuts off or system pressure drops, uncontrolled backflow can contaminate clean water lines, flood drainage channels, or damage equipment. Plumbers, irrigation contractors, and facility maintenance teams rely on a dependable one-way valve that seals automatically — without springs, solenoids, or manual operation. This UPVC one-way non return flap check valve is engineered for exactly that role.

Each valve is constructed from rigid UPVC (unplasticized polyvinyl chloride) with a hinged flap disc that opens under forward flow and closes by gravity the moment flow stops. Available in ten pipe sizes from 20 mm (DN15 / ~¾ in) through 160 mm (DN150 / ~6¼ in), the body uses standard socket-end connections compatible with Schedule 40 and metric UPVC pipe systems. Flap and seat surfaces are machined for a consistent seal across the full size range.

Typical applications include residential and commercial cold-water supply lines where backflow prevention is required, drip and sprinkler irrigation mains that must hold prime between cycles, and gravity-fed drainage or stormwater outfalls where tidal or surge backflow must be blocked. The lightweight UPVC body also suits aquaculture tank plumbing and chemical-dosing lines where metal valves would corrode.

🔗 Compatibility: Fits standard UPVC / PVC-U socket-end pipe systems. Verify your pipe's outer diameter and schedule before ordering. Not rated for hot water, steam, or compressed air service.

✅ Key Features of These UPVC Non Return Flap Check Valves

🔄Gravity-Close Flap Mechanism
The hinged disc opens freely under forward flow pressure and closes automatically under gravity when flow ceases — no spring fatigue, no actuator required.

🧪Rigid UPVC Construction
UPVC resists chlorinated water, mild acids, alkalis, and many common irrigation chemicals, making these valves suitable for water treatment and agricultural use without corrosion risk.

📏Wide Size Range: DN15 to DN150
Ten nominal diameters from 20 mm (DN15) to 160 mm (DN150) cover everything from household supply branches to large-bore drainage mains — select the size that matches your pipe's nominal bore.

⚖️Low Cracking Pressure
The lightweight flap disc opens at low differential pressure, minimising head loss in gravity-fed and low-pressure systems where a heavy spring-loaded valve would restrict flow.

🔧Socket-End Connections
Plain socket ends accept standard UPVC pipe with solvent cement, integrating directly into existing PVC-U pipework without adapters or threaded transitions.

📦Multi-Pack Options (1, 3, or 5 Pcs)
Order a single valve for a repair job or choose the 3- or 5-piece pack for new installations and project stock — quantity pricing reduces per-unit cost.

📐 Technical Specifications — UPVC Flap Check Valve

Valve Type	Flap (swing disc) check valve, one-way non-return
Body Material	UPVC (Unplasticized Polyvinyl Chloride)
Flap / Disc Material	UPVC
Connection Type	Socket end (solvent-cement weld)
Available Sizes (OD × DN)	20 mm DN15 · 25 mm DN20 · 32 mm DN25 · 40 mm DN32 · 50 mm DN40 · 63 mm DN50 · 75 mm DN65 · 90 mm DN80 · 110 mm DN100 · 160 mm DN150
Nominal Pressure Rating	See variant options
Operating Temperature	0 °C – 60 °C (32 °F – 140 °F); cold water service recommended
Media Compatibility	Cold water, irrigation water, mild chemical solutions (non-oxidising); not suitable for hot water, steam, or compressed air
Closure Method	Gravity (no spring)
Flow Direction	One-way; arrow marked on body
Colour	Grey (standard UPVC)
Pack Quantities Available	1 Pcs · 3 Pcs · 5 Pcs

❓ Frequently Asked Questions

How do I choose the correct valve size?

Match the valve size to your pipe's outer diameter (OD), not the nominal bore label. For example, a pipe labelled DN20 has a 25 mm OD — select the 25 mm (DN20) valve. If you are unsure, measure the outside of your existing pipe with calipers before ordering.

Can this valve be installed in any orientation?

The flap check valve is designed for horizontal or vertical upward-flow installation. In vertical downward-flow lines the flap may not close reliably under gravity alone. Always orient the valve so the flow arrow on the body points in the direction of intended flow.

Is UPVC suitable for outdoor or UV-exposed installations?

UPVC has moderate UV resistance but can become brittle after prolonged direct sunlight exposure. For outdoor installations, wrap the valve in insulation lagging or install it inside a valve box to protect it from UV radiation and frost.

What is the maximum working pressure for these valves?

Rated working pressure varies by pipe size and wall schedule. As a general guide, UPVC fittings in this size range are typically rated at 6–16 bar depending on diameter — larger diameters carry lower pressure ratings. Contact us to confirm the rating for your specific size if your system operates above 6 bar.

How is the valve connected to the pipe?

The valve uses plain socket ends that are bonded to UPVC pipe using standard solvent cement (PVC glue). Clean and deburr the pipe end, apply primer if required by your local code, coat both surfaces with solvent cement, insert the pipe fully into the socket, and hold for 30 seconds. Allow the joint to cure before pressurising.

Will this valve work in a drip irrigation system?

Yes. The gravity-close flap opens at low differential pressure, making it well suited to low-pressure drip and sprinkler irrigation mains. It prevents siphoning back through the mainline when the pump stops, protecting emitters and filters from contamination. Select the size that matches your irrigation main's pipe OD.

Can I use this valve for chemical dosing lines?

UPVC is compatible with many mild acids, alkalis, and non-oxidising chemical solutions at ambient temperatures. However, compatibility depends on the specific chemical concentration and temperature. Always verify chemical compatibility with a UPVC resistance chart before installation in dosing applications.

🛒 Select your Size and Amount above, then add to cart.

UPVC One Way Non Return Flap Check Valve Plumbing Fittings Pipe Tube Connector

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Beschreibung

UPVC Non Return Flap Check Valve — Stop Backflow Without Manual Intervention

✅ Key Features of These UPVC Non Return Flap Check Valves

📐 Technical Specifications — UPVC Flap Check Valve

❓ Frequently Asked Questions

UPVC One Way Non Return Flap Check Valve Plumbing Fittings Pipe Tube Connector

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