End sewer flap DN 110

Product detailed description

The Karmat end sewer flap DN 110 is commonly used in residential, commercial and industrial drainage applications. This device is not intended for flow regulation but rather for passive protection of the system from environmental factors such as rising water levels and animal intrusion. It is especially useful in agricultural settings, greenhouses and areas with high groundwater risk.

This flap is installed on the outlet side of sub-surface drainage systems to prevent backflow when the external water level rises above the drain outlet. It also prevents blockage due to sediment and debris carried by surface run-off. The design allows continuous outflow while preventing reverse flow under specific conditions, making it ideal for non-pressurised gravity-fed drainage systems.

Technical parameters

Installation and connection

Installation involves cutting the drainage pipe to length and fitting the flap directly onto the end. A secure mechanical connection is achieved using standard push-fit or socket-and-spigot methods, depending on the pipe system. Ensure the flap is aligned correctly with the direction of flow to avoid misalignment that could compromise the seal. Check that the sealing ring is undamaged and properly seated. Common installation errors include improper orientation, incorrect pipe preparation and failure to inspect the flap’s closure mechanism after installation. Always verify that the flap closes freely and is not obstructed by soil or debris during burial.

Compatibility and accessories

This end sewer flap is compatible with standard polypropylene and PVC drainage pipe systems. For proper installation, ensure that the pipe ends are cut square and free of burrs. Additional components such as sealing rings or protective covers may be required for specific environments, though none are included with the product. This flap is suitable for use in both rainwater and foul water drainage systems, provided the fluid does not exceed the material limitations of the polypropylene construction.

Technical background for designers

The operating principle relies on a hinged flap that opens under the force of outgoing water flow and closes when the external water level rises. This flap remains open during normal drainage but seals when the external water level exceeds the internal, preventing backflow and reverse flooding. The polypropylene construction offers resistance to high temperatures up to 95°C and chemical agents found in plant protection products. The flap integrates into non-pressurised gravity systems and requires no electrical power or control mechanisms. Longevity depends on correct installation, regular inspection and avoidance of mechanical stress during backflow events.

Service and operation

Periodic visual inspections should be performed to confirm the flap remains unobstructed and functions freely. Clean the flap and surrounding area if debris accumulation is observed. Inspect the sealing ring for wear or damage and replace if necessary. No routine service intervals are specified in the product documentation, but maintenance is recommended following major storm events or signs of reduced performance.

Frequently asked questions

Can the Karmat end sewer flap DN 110 be used in pressurised drainage systems?
No, this flap is designed for non-pressurised gravity-fed systems only. Pressurised flow may cause premature wear or failure of the flap mechanism.

Is the flap resistant to aggressive chemicals?
Yes, the polypropylene material resists common chemical agents, including those found in plant protection products.

Does the flap require any additional sealing compound during installation?
No, the flap features an integrated sealing ring that ensures a watertight connection when properly aligned with the pipe.

What is the maximum temperature resistance of the flap?
The flap is rated for use up to 95°C, making it suitable for hot water drainage in certain applications.