Stainless Steel Flap Valves

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.
  • 400 to 2000mm square aperture
  • Suitable for static pressures up to 5 metres above invert
  • Corrosion resistant – available in a range of stainless steels
  • Custom built to suit project requirements
  • Double hung to ensure full face sealing
  • Low operating (cracking) head due to light weight
  • Reduced maintenance
Size Range
  • 400mm square up to 2000mm square or any rectangular size withinthese limitations. Larger sizes can be accommodated depending on pressure and duty
  • Manufactured from stainless steel to BS EN 10088: 1995 grade 1.4401 (316).
Pressure Rating
  • 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.
Mounting
  • 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.

OPTIONS

Can be manufactured from a grade of stainless steel to suit customer requirements. Get in touch. sales@hambakergroup.com

Mounting
  • 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.

Frames/ Doors
  • Top, bottom and side pressed members produce a sloping surface which will guarantee closure in balanced or dry conditions.
Frame Seal

Is an EPDM (Ethylene Propylene Di Methyl) wiper type seal having an angled lip seal. EPDM is chosen for its greater resistance over neoprene to ultraviolet degradation. The seal is fixed with a corrosion resistant retaining strip and stainless steel fasteners.

 

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.

 

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