{"product_id":"upvc-non-return-check-valve-flap-ball-pipe-fitting-20mm-110mm","title":"UPVC One Way Non Return Flap Ball Check Valve Pipe Fittings I.D 20 25 32 40mm ","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eUPVC Non-Return Check Valves — Flap \u0026amp; Ball Design to Stop Backflow in Cold-Water \u0026amp; Irrigation Systems\u003c\/h2\u003e\n    \u003cp\u003eBackflow 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.\u003c\/p\u003e\n    \u003cp\u003eEach 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.\u003c\/p\u003e\n    \u003cp\u003eTypical 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.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔗\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e 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.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These UPVC Non-Return Check Valves\u003c\/h2\u003e\n    \u003cul class=\"hdiy-list\"\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eDual Flap \u0026amp; Ball Check Mechanism\u003c\/strong\u003e — 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.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eNine Sizes: DN15 to DN100\u003c\/strong\u003e — 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.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003eCorrosion-Resistant UPVC Body\u003c\/strong\u003e — 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.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cstrong\u003ePassive Operation — No Power Required\u003c\/strong\u003e — The check mechanism operates entirely on flow pressure and gravity, with no electrical components, actuators, or manual intervention needed during normal service.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e💧\u003c\/span\u003e\u003cstrong\u003eLow Cracking Pressure\u003c\/strong\u003e — 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.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🌡️\u003c\/span\u003e\u003cstrong\u003eCold-Water Service Rated\u003c\/strong\u003e — Optimized for cold-water supply, irrigation, pond circulation, and drainage applications where operating temperatures remain below approximately 60 °C (140 °F).\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — UPVC Non-Return Check Valves\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eUPVC (Unplasticized Polyvinyl Chloride)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eValve Type\u003c\/th\u003e\n\u003ctd\u003eNon-Return Check Valve (Flap \u0026amp; Ball)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFlow Direction\u003c\/th\u003e\n\u003ctd\u003eOne-way (unidirectional)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eInterior Diameter Range\u003c\/th\u003e\n\u003ctd\u003e20mm – 110mm (DN15 – DN100)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Sizes\u003c\/th\u003e\n\u003ctd\u003e20mm (DN15), 25mm (DN20), 32mm (DN25), 40mm (DN32), 50mm (DN40), 63mm (DN50), 75mm (DN65), 90mm (DN80), 110mm (DN100)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eConnection Type\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePressure Rating\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCracking Pressure\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTemperature Range\u003c\/th\u003e\n\u003ctd\u003e0 °C – 60 °C (32 °F – 140 °F)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBody Color\u003c\/th\u003e\n\u003ctd\u003eGrey (UPVC standard)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOperation\u003c\/th\u003e\n\u003ctd\u003ePassive (no power required)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 piece per order\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-faq\"\u003e\n    \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is a non-return check valve, and how does it work?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA 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.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the correct size for my pipe?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMatch 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.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I install this valve in any orientation?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor 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.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs this valve suitable for use on a pump outlet to prevent drain-back?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. 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.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan these valves be used for buried or underground installations?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eUPVC 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.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between a flap check valve and a ball check valve, and why does this product use both?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA 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.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use this valve for irrigation systems and garden water lines?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. 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.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your \u003cstrong\u003esize (ID)\u003c\/strong\u003e above, then add to cart.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is a non-return check valve, and how does it work?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"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, creating a seal that prevents backflow.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the correct size for my pipe?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Match the valve's interior diameter (ID) to the nominal bore of your pipe: 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.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I install this valve in any orientation?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Horizontal installation is generally supported, and vertical installation with upward flow is also common for pump outlet protection. Check the valve body for a flow-direction arrow and install accordingly. Contact us to confirm orientation requirements for your specific size.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this valve suitable for use on a pump outlet to prevent drain-back?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. 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.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can these valves be used for buried or underground installations?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"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.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between a flap check valve and a ball check valve, and why does this product use both?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"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 provides redundancy \\u2014 if one element does not seat perfectly, the other continues to provide backflow protection.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this valve for irrigation systems and garden water lines?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"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. Select the size that matches your pipe's nominal bore and confirm the connection type before ordering.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"50mm（DN40） \/ 1","offer_id":52332259115282,"sku":"GLFBLFFBSGD00375x1","price":40.77,"currency_code":"USD","in_stock":true},{"title":"63mm（DN50） \/ 1","offer_id":52332259148050,"sku":"GLFBLFFBSGD00376x1","price":32.37,"currency_code":"USD","in_stock":true},{"title":"32mm（DN25） \/ 1","offer_id":52332259180818,"sku":"GLFBLFFBSGD00377x1","price":13.29,"currency_code":"USD","in_stock":true},{"title":"40mm（DN32） \/ 1","offer_id":52332259213586,"sku":"GLFBLFFBSGD00378x1","price":17.58,"currency_code":"USD","in_stock":true},{"title":"110mm（DN100） \/ 1","offer_id":52332259246354,"sku":"GLFBLFFBSGD00379x1","price":161.42,"currency_code":"USD","in_stock":true},{"title":"75mm（DN65） \/ 1","offer_id":52332259279122,"sku":"GLFBLFFBSGD00381x1","price":46.47,"currency_code":"USD","in_stock":true},{"title":"90mm（DN80） \/ 1","offer_id":52332259311890,"sku":"GLFBLFFBSGD00382x1","price":80.74,"currency_code":"USD","in_stock":true},{"title":"20mm（DN15） \/ 1","offer_id":52332259344658,"sku":"GLFBLFFBSGD00383x1","price":6.56,"currency_code":"USD","in_stock":true},{"title":"25mm（DN20） \/ 1","offer_id":52332259377426,"sku":"GLFBLFFBSGD00384x1","price":9.18,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/64b91696-f574-4371-ac42-7db790b6ebbf.jpg?v=1782201899","url":"https:\/\/homediyer.com\/products\/upvc-non-return-check-valve-flap-ball-pipe-fitting-20mm-110mm","provider":"HomeDIYer","version":"1.0","type":"link"}