Flap Valves HDPE - Flood Protection

Select flap valve types below for more information:

Flap Valves Wall mounted: WA-PTKG flap valves anchor mount to a flat headwall.

Flap Valves Flange mounted: WA-PTKF flap valves bolt to a flange on the discharge pipe.

Flap Valves: WA-PTKA, 10 degree flap valve doors mounted to a flat headwall.

Flap Valves: WA-PTKA 10 degree flap valve doors are used when valves are always covered in water.

Flap Valves : WA-PWKF flap valves mount on discharge lines when lines are pressurized - pump discharge.

In-line Penstocks Inside pipe mounting.


WA-Flap Valves prevent water backup flooding through storm pipes and discharge pipes. They offer very low head opening pressures measured in millimeters.

HDPE Flap valves operate automatically to discharge water behind the flap door and close automatically when water rises on the outflow side. Rising waters from flood conditions, high tides and storm serge are prevented from entering a drainage system. HDPE Flap Valves weigh less than metal units and are virtually maintenance free.

Any metallic materials use in HDPE flap valves are 316L stainless steel - e.g. hooks, hinges, balancers and reinforcement. 316L stainless steel provide corrosion protection for long life operations.

Download cut sheet Introduction To HDPE Flap Valves


- Flap valves, protection infrastructure from storm damage. They prevent back flow through discharge pipes, protect low level lands and building structures from flood waters.

- Standard HDPE flap valves may be covered by one meter water column on a continuous bases and in the event of flood conditions five meters of water head up to 72 hours. Higher pressures are available.

- Flap valves manufactured with HDPE materials have very low cracking heads, doors open for one way flow with just a few millimeters of deferential pressure.

Typical applications:

- Prevents back flow from high tidal waters.

- Prevents flooding from storm events.

- Discharges waters to tidal inlets, ditches, manholes, culverts, reservoirs, ponds, and basins.

- Flap Valves are flow control valves that allow outflow of water while preventing back flow.

- Flap Valves can be used on 4" diameter pipe (100 mm) and up.

- HDPE flap valves require very low opening pressure.

- When water on the face side of the flap door rises above water on the back side, the watertight door closes to prevent back flow.

- Flap Valves may be installed above the waterline or below the waterline.

- 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



Available for all American and International pipe sizes
All pipe materials: PVC - Ductile Iron - Concrete - HDPE

Westatlantic Tech Corp, Contact or 902 455 4455



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Flap Valves, hdpe, floods, flood control, rising ocean levels, river overflows, river levels, storm events, Penstocks, Sluice Gates, stop logs, Weirs, Float Valves, Flood Gates, stainless steel, 316L: USA and Canada; 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, Calgary, British Colombia, BC; Vancouver, Saskatchewan, SK; Regina, Saskatoon, Manitoba MB; Winnipeg, Ontario, ON; Oakville, Toronto, Mississauga. Quebec: QC; Montreal, New Brunswick, NB, Nova Scotia, Newfoundland Labrador, NL.