Flap Valves HDPE - Back flow Prevention

Flap Valves are placed at out falls in storm water management control systems (ICD)

Storm serge from rising sea water is prevented from entering a storm drain system. HDPE Flap valves may be used to prevent back flow at all size outlets. HDPE Flap valves are easy to install, light weight and virtually maintenance free.

Westatlantic Class Valves offer HDPE material condtruction with 316L stainless, they provide the best corrosion resistant products for long life operations.

Introduction To HDPE Flap Valves

Flap valves are designed for use in water control systems and flood protection from rising sea levels. They prevent back flow of tidal waters back through the discharge structure and protect wet lands and city structures.

Standard valve pressures are good for 1M of pressing water on a continue io us base and 5M of pressing water in the event of flood conditions for a 72 hour period. Higher pressures are available.


Available mounting designs include

Flap Valves Wall mounted : flap valve bolt mounted to a flat wall to prevent reverse flow.

Flap Valves Flange mounted : flap valve for attachment to a flanged at the end of a pipe.

Flap Valves Tidal Water : flap valve door is mounted at a 10 degree angle for positive closure.

Flap Valves Underwater : flap valve always water covered, 10 degree angle.

Flap Valves Pressure Line : flap valves for pressure pump out fall lines with venting.

Typical applications include discharges to tidal waters, manholes, culverts, reservoirs, ponds basins and standpipes. Flap Valves permit the outflow of water while preventing back flow.

Flap Valves can be as simple as a small 100 mm HDPE flap or much larger Flap Valve for ocean out falls. Out falls not equipped with back flow protection, can have a devastating effect in the event of heavy rainfalls, storms and higher than normal tides.

HDPE flap valves require very low opening pressure. When water on the face side of the flap valve rises above water on the back side, it closes automatically to prevent back flow.

Flap Valves may be installed above the waterline or below.

HDPE (High Density Polyethylene) Flap Valves, are lightweight, corrosion resistant non-return check valves for the prevention of flood damage.

General Installation Instructions Wall Mount HDPE Flap Valves


Contact us: Westatlantic Tech Corp., 902 455 4455


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Westatlantic Tech Corp., USA and Canada HDPE Flap Valves. USA: Louisiana, LA, Alabama, AL, Mississippi, MS, Texas, TX, Ohio, Illinois, PA, South Carolina, SC, North Carolina NC, Wisconsin, WI, Milwaukee. Canada: Alberta, AB; Edmonton, Fort McMurray Calgary, Fort Nelson, Grande Prairie, Lioydminster, Red Deer, Lethbridge, British Colombia, BC; Kelowna, Vancouver, Prince Rupert, Kitimat, Terrace, Fort St John. Saskatchewan, SK; Regina, Saskatoon, Prince Albert, Estevan, Swift Current. Manitoba MB; Winnipeg, Thompson. Ontario, ON; Oakville, Toronto, London, Ottawa, Hamilton, Mississauga. Quebec: QC; Montreal, Quebec City, Trois-Rieviers, Val-d'or, Chebougamau, Sherbrooke. New Brunswick, NB, Nova Scotia, Newfoundland Labrador, NL. Including Saint John, Moncton, Halifax, Sydney, St John's,