Althon Circular HDPE flap valves are recommended for use in emergency situations to protect against and prevent flooding during periods of extreme weather. Our circular flap valves are usually installed above the normal water level to prevent back flow up a pipe during times of heavy rain and flooding. The PTK-G flap valve is suitable for use with a water pressure of 5 MWC for 72 hours and 1 MWC for 50 years. Althon circular flap valves are HDPE with HDPE ribs and can be further reinforced where necessary with stainless steel

Althon flap valves can be factory fitted to our precast concrete headwalls and chambers. For installation on site we supply with our flap valves an EPDM seal, stainless steel fixings and chemical anchors. Our circular flap valves are usually retro-fitted to existing or cast in-situ structures or manhole chambers