Flap Valves HDPE - Westatlantic Tech Corp., Water Control

Select flap valve types below for more information:

HDPE Flap Valves may be round, Rectangular or Square design.




Waterhead Standard: 1 Mwc
Flood conditions: 5 Mwc 72 hours
Higher pressures available.

Flap Valves Wall mounted: WA-PTKG

Flush mounted to a headwall.

Sizing: 100mm to 1500mm
Other sizing on request.







Waterhead Standard: 1 Mwc
Flood conditions: 5 Mwc 72 hours
Higher pressures available.

Flap Valves Flange mounted:

Flap valves bolt to a the pipe discharge flange.

Sizing: 100mm-1500mm
Other sizing on request






Waterhead Standard: 1 Mwc
Flood conditions for 5m 72 hours
Higher pressures available.

Flap Valves: WA-PTKA

10 degree flap valve doors mounted to a headwall

Sizing: 100mm - 15000mm
Other sizing on request





Waterhead Standard: 1 Mwc
Flood conditions: 5 Mwc waterhead 72 hours
Higher pressures available.

Flap Valves : WA-PWKF

Flap valves mount on pump discharge lines-pressure lines.

Sizing: 100mm to 15000mm
Other sizing on request




Flap Valve - Penstock Combination WA-POTK-G

Down position: as a Flap Valve
Lifted position: Free flow

Waterhead Standard: 1 Mwc
Flood conditions: 5 Mwc waterhead 72 hours
Higher pressures available.

Contact Westatlantic for sizing
1-902 455-4455





In-line Penstocks Inside pipe mounting.

See Penstocks and Sluice gates

Flap Valves protect against backup during high water events. The doors open to allow flow to begin with very low water head and withstand against high head pressures.


Flap valves operate automatically to discharge water and close automatically to stop back flow. Rising waters from flooding or tidal conditions are prevented from entering a drainage system. HDPE Flap Valves weigh less than metal units and are virtually maintenance free.

Any metallic materials in HDPE flap valves use 316L stainless steel - for example 316L stainless for hinges, door hooks balancers and reinforcement bars. 316L stainless steel offers 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 for 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




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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.