Flap Valves
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FLAP Valves
Flap valves are used as an efficient backflow prevention solution in most free discharge applications. These are used for automatic drainage from outfall structures to river , estuaries and sea and for preventing reverse flow flood / tide from river, estuary and sea to plant. These are gravity operated and need minimal water pressure for operation. The flap opens when the head in pipe or conduit exceeds 0.2 feet above the head in the receiving body of water. The flap closes when the head in the receiving body of water exceeds the head in the pipe or the conduit. When fully open the flap valves offers a very low head loss. These are offered in varied designs and various materials of construction such as Cast Iron / Ductile cast iron / Stainless steel / Super Duplex stainless steel / HDPE / Composite etc to suit the intended application.
SERIES : A-601 – CAST IRON FLAP Valves
- Opening Size range: 100 mm to 750 mm Higher sizes on request
- Head Range: Seating head up to 6 m.
- Applicable Standards: As per Jash design.
- Mounting: Face Wall Anchored
- Sealing system: Resilient Seal arrangement
SERIES : A-602 – CAST IRON FLAP Valves (FC-AC & FV-ACP)
- Opening Size range: 300 mm to 1500 mm (FV-ACP design) 300 mm to 2700 mm (FV-AC design) Higher sizes on request
- Head Range: Suitable for high seating head as per requirement.
- Applicable Standards: As per Jash design.
- Mounting: Face Wall Anchored
- Sealing system: Resilient Seal arrangement
SERIES : A-603 – CAST IRON FLAP Valves (FV – AR)
- Opening Size range: 300 mm to 2700 mm Higher sizes on request
- Head Range: Suitable for high seating head as per requirement.
- Applicable Standards: As per Jash design.
- Mounting: Face Wall Anchored
- Sealing system: Resilient Seal arrangement
SERIES : A-611, 612 – STAINLESS STEEL FLAP Valves
- Opening Size range: 300 mm to 2700 mm Higher sizes on request
- Head Range: Suitable for high seating head as per requirement.
- Applicable Standards: As per Jash design.
- Mounting: Face Wall Anchored
- Sealing system: Resilient Seal arrangement
SERIES : A-641, 642 – HDPE FLAP Valves
- Opening Size range: 300 mm to 1500 mm Higher sizes on request
- Head Range: Suitable for low head conditions.
- Applicable Standards: As per Jash design.
- Mounting: Face Wall Anchored
- Sealing system: Resilient Seal arrangement
SERIES : A-652 – COMPOSITE FLAP Valves
- Opening Size range: 300 mm to 2700 mm Higher sizes on request
- Head Range: Suitable for low head conditions.
- Applicable Standards: As per Jash design.
- Mounting: Face Wall Anchored
- Sealing system: Resilient Seal arrangement
SERIES : A-672 – FLEXIBLE FLAP Valves
- Opening Size range: 300 mm to 1200 mm Higher sizes on request
- Head Range: Suitable for low head conditions.
- Applicable Standards: As per Jash design.
- Mounting: Face Wall Anchored
- Sealing system: Resilient Seal arrangement
Waterfront have designed a range of ‘next generation’ HDPE (High Density Polyethylene) Flap Valves. This range comprises lightweight, corrosion resistant flap valves which act as Non-Return Valves and check valves for the prevention of reverse flows.
The product has been designed to be flexible to suit any installation type:
Wall mounted – this basic flap valve can be easily mounted to a flat wall to prevent reverse flow.
Spigot mounted – this type of valve can be mounted for a ‘push fit’onto the end of a pipe
Tapered spigot for a ‘push fit’ into existing pipes
Flange mounted – this range of valves is suitable for fixing to flanged pipes. We can supply to metric and imperial flange sizes to both BS and EN standards.
Tidal – Our tidal range is supplied with the door at a 10 degree angle suitable for tidal water situations. Other angles are available upon request.
All our valves suit different shaped outfalls (i.e. square, round, elliptical) and are suitable for pumped outfalls with integral stroke limiters and vent pipes.
Types: Square, Rectangular or Oval Shapes
Size Range: Standard 100mm – 1000mm, bespoke sizes can be designed to suit project specific requirements
Pressure: Standard 6 mwc/0.6 bar, bespoke sizes can be designed to suit project specific requirements
Materials: HDPE or a combination of HDPE and stainless steel 316 reinforcements.
Types: Shape of spigot can be Parallel or Tapered
Size Range: Standard 100mm – 1000mm, bespoke sizes can be designed to suit project specific requirements
Pressure: Standard 6 mwc/0.6 bar, bespoke sizes can be designed to suit project specific requirements
Materials: HDPE or a combination of HDPE and stainless steel 316 reinforcements.
Types: Flange mounted to either PN10 or PN16
Size Range: Standard 100mm – 1000mm, bespoke sizes can be designed to suit project specific requirements
Pressure: Standard 6 mwc/0.6 bar, bespoke sizes can be designed to suit project specific requirements
Materials: HDPE or a combination of HDPE and stainless steel 316 reinforcements.
Types: Tidal flap valve at a 10 degree angle suitable for tidal application, other angles available on request
Size Range: Standard 100mm – 1000mm, bespoke sizes can be designed to suit project specific requirements
Pressure: Standard 6 mwc/0.6 bar, bespoke sizes can be designed to suit project specific requirements
Materials: HDPE or a combination of HDPE and stainless steel 316 reinforcements.
Benefits of HDPE Flap Valves
- Lightweight range of flap valves
- Standard range stocked available for quick delivery
- Bespoke valves can be custom built to customer’s requirements
- Available – wall, spigot or flange mounted
- Low cracking heads
- Easy and quick installation – no need for grout between frame and wall
- Robust and rigid construction
- UV stable
- Fully recyclable
- Materials are corrosion resistant
- Little to no maintenance required
- Leakage rates that are below both BS7775 and DIN 19569-4 class 5
Stainless Steel Flap Valves
Waterfront design, manufacture and, if require, install stainless steel flap valves to suit exact project-specific requirements. Our Stainless Steel flap valves are suitable for use in fresh water, rivers, outfalls and surface and storm water applications.
Features
- Our design features high duty corrosion resistant construction with less hydraulic losses while still allowing for a light weight design that will allow easier and cheaper installation costs.
- Size Range: Designed bespoke to project specific requirements.
- Pressure: Available up to 10 mwc
- Materials: Frame door and fixings – Stainless Steel 304 or 316. Seal – EPDM.
- Mounting Options: Wall, Flange or Tidal
Fish Friendly Flap Valves
Waterfront design and manufacture a range of ‘fish friendly’ flap valves that are used to help the migration of fish around water flow control equipment.
Our design is based on our standard HDPE flap valve which has a smaller, upside down pet flap attached to the front; attached to this pet flap is a float on the end of a stainless steel arm. On low flows the pet flap will remain open to allow for the continued movement of fish. On higher flows the flap will close once the float reaches a vertical position.
Features
- Our design features high duty corrosion resistant construction with less hydraulic losses while still allowing for a light weight design that will allow easier and cheaper installation costs.
- Size Range: Designed bespoke to project specific requirements.
- Pressure: Standard 6 mwc/0.6 bar, other pressures available.
- Materials: Combination of HDPE and stainless steel 316 reinforcements.
