Flap Valves are one-way valves which are installed at the open end of a pipe line or culvert. Their purpose is to allow downstream water to exit the pipe via a one-way flap door, whilst preventing rising water levels outside of the pipe from entering the pipe and flowing back up the system and flooding the protected area. Both lightweight, corrosion resistant our Flap Valves act as Non-Return Valves and check valves for the prevention of reverse flows.
Traditional Flap Valves are manufactured from Cast Iron and whilst Flexseal has access to these, our standard range of Flap Valve are manufactured from HDPE, a high strength, thick plastic material which provides a whole host of benefits.
Available in various forms for most installation methods, Flexseal Flap Valves can be wall mounted, spigot mounted or available as flange mounted on request.
Flexseal Flap Valves incorporate various seals to ensure leakage into the pipe system is prevented. An integrated lip seal made from EPDM creates a watertight seal between the flap and the body of the valve. All Flap Valves are also provided with a strip of self-adhesive neoprene to provide a seal between the valve and the wall (wall mounted Flap Valve) or pipe (spigot Flap Valve).