Flap Valves HDPE - Westatlantic Tech Corp., Water Control

Select flap valve types below for more information:

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

Flap Valve - Penstock Combination Down or Lifted position

In-line Penstocks Inside pipe mounting.

See Penstocks and Sluice gates


WA-Flap Valves HDPE prevent water backup flooding. Very low head opening pressures open the valve door to allow flow.


Flap valves operate automatically to discharge water and close automatically to stop back flow 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.

Doors open for one way flow with just a few millimeters of deferential pressure.

- 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




Back to Main Page



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.