Coplastix® Flap Valves- Rectangular

Coplastix Flap Valves utilise synthetic materials combined with the strength of stainless steel, providing a range of flap valves having high strength and rigidity but which are very sensitive to small differential heads.
  • 400 -2000mm square aperture
  • Pressure Rating 5.0 metres seating, static head
  • Flush face helps prevent debris build-up
  • Custom built to suit project requirements
  • Corrosion resistant
  • Low operating (cracking) head due to light weight
  • Double hung to ensure full face sealing
  • Replaceable mechanically fixed seals
  • Reduced maintenance

Coplastix® flap valves, designed and manufactured for use in modern industrial and domestic effluent environments.  Protected river and sea outfalls with gravity flows also benefit.

Utilisation of the latest synthetic material combined with the strength of stainless steel provides a range of flap valves having high strength and rigidity but which are very sensitive to small differential heads.

Standard Size Range
  • 400mm square up to 2000mm square or any rectangular size within these limitations. Larger sizes can be accommodated depending on pressure and duty.
Pressure Rating
  • Flap valves as manufactured above are suitable for static pressures up to 5 metres above invert and can be used in sewage, potable water, rivers, estuaries etc.
  • All flap valves are designed to suit individual requirements.
  • These flap valves are not suitable for locations subject to direct pumping duties with sudden maximum flow and shut-off characteristics.
  • Standard fixing arrangement is wall fixing onto a flat vertical wall.

Note: It is recommended that at least 300mm fall away is provided at the invert to prevent fouling of the bottom of the door.

  • The primary application of flap valves is for surface water drainage associated with rivers, estuaries and sea water outfalls to prevent reverse flow conditions.
  • Flap valves can be utilised on final effluent outfalls for sewage treatment plant to prevent flood damage within the works.
  • The flap valves should be positioned on the outfall structure to avoid the build-up of debris around the invert area which could prevent the valve operating correctly.
  • Sufficient fall-away should be provided between the invert of the flap valve and the base of the outfall structure.
  • Flap valves are designed for all types of pipe end closures to prevent entrance of back water.
  • These valves are supplied in various configurations to fit most installation needs.
  • An inclined seating plane is used to ensure that the valve will operate a ‘positive close’ position.
  • Flap valve application on sea water outfalls should be given careful consideration due to turbulence of flow across the flap, particularly when severe wave action is involved, resulting in dislocation of the flap relative to its seals.
    • Wherever possible the flap valve should be located in a shielded position to minimise the effects of severe wave action.
  • Ham Baker manufactures a comprehensive range of flap valves.  Generally, most flap valves are of single door type but double door types are also available.