The TRU-FLAP floating gate system is designed to prevent flooding and backflow caused by high downstream water levels, and acts as a floating weir with automatically adjusting crest elevation. TRU-FLAP can and has been installed at combined sewer overflow (CSO) locations, sanitary sewer overflow (SSO) locations, holding tank overflows and pond overflows. Overloading of sewer systems and treatment plants is avoided, and energy costs for pumping systems and wastewater treatment are reduced.

Features

-Up to 4 feet (1.2 m) headroom

-Modular construction up to 20 ft (6 m) long

-Hydraulically ideal shape

-Shutter open in rest position

-Increases with minimal rise in downstream water level

-Low hydraulic resistance

-Easy to adapt to existing installations

-Stainless steel construction

Application scope

The TRU-FLAP floating gate can vary from the GTF-30-* to the GTF-120-*. The GTF-30-* is designed for 12-inch (30 cm) backflow protection and measures up to a maximum of 20 feet (6 m) in length. The GTF-120-* is designed for 48 inch (120 cm) backflow protection and measures up to a maximum of 20 feet (6 m) in length. TRU-FLAP model selection is based solely on the length of the concrete weir and the required backwater height. Units are currently marked with an asterisk due to the wide variety of model options.

How it works

The TRU-FLAP floating gate is a stainless steel pivoting flap mounted on a weir. In its resting position, the TRU-FLAP hangs down under its own weight, allowing the upstream overflow to pass unimpeded over its crest, as any weir would. As the downstream water level rises, the floating flap pivots upwards to prevent backflow into the sewer system, reservoir or pond, while establishing a new weir height. TRU-FLAP's lightweight design makes it highly responsive to minimal changes in water level, while ensuring structural stability.

The TRU-FLAP floating gate can be sealed on all four sides to prevent backflow if the downstream water level exceeds the height of the flap.