PVC-KG non-return valve

  Datasheet (PDF)

The PVC-KG non-return valve KGRE provides dependable backflow prevention for non-pressure underground drainage and gravity sewerage networks. Engineered for civil infrastructure and building drainage installations, the unit features an integrated flap mechanism with an inspection access cover. Manufactured from robust unplasticised polyvinyl chloride (PVC-U) in orange-brown, it connects seamlessly into gravity lines via push-fit sockets with EPDM sealing gaskets rated leak-proof up to 0.5 bar.

Technical specifications

The KGRE non-return valve prevents reverse sewage flow during flood events or main line overloads while maintaining full bore gravity capacity under normal operating conditions. It incorporates a top-mounted maintenance cover for rapid chamber inspection and mechanical access without disconnecting pipework.

• Continuous service temperature: up to 40 degrees C (short-term peak resistance up to 60 degrees C)
• Working medium pH compatibility: pH 2 to pH 12 (resistant to acidic and alkaline discharges)
• Joint tightness rating: leak-tight up to 0.5 bar hydrostatic pressure
• Flammability rating: Class B2 normal flammability in accordance with DIN 4102
• Sealing system: elastomeric ring profile conforming to EN 681-1

Applications

The valve is suited for non-pressure underground drainage and gravity sewerage lines carrying domestic wastewater, industrial effluents, and rainwater runoff. It is certified for application code UD, permitting buried installation both inside building footprints and externally within municipal utility trenches.

In gravity stormwater and sewage configurations, the device protects basements, ground-level connections, and lower collection branches against sewage backflow caused by torrential rainfall, downstream line clogs, or surcharge conditions. It integrates into municipal networks, residential collector lines, and commercial discharge schemes.

Materials and standards

Constructed from durable orange-brown unplasticised polyvinyl chloride, the valve body delivers high mechanical resistance and smooth hydraulic interior surfaces. The socketed connection utilises synthetic EPDM rubber gaskets complying with EN 681-1 to preserve joint tightness under ground settlement or deflection.

The chemically inert material resists salts, soil aggression, caustics, and acidic wastewater streams across a broad range of pH 2 to pH 12. Its fire safety performance meets DIN 4102 class B2 standards, providing long-term structural integrity and minimal hydraulic friction for buried gravity sewage systems.