KKL is a flap valve designed for installation on flat walls. It is used in low-pressure channels to prevent backflow and flooding, and can be installed both above and below the water surface.The flap is angled at 15° and mounted in a robust, maintenance-free rubber hinge with embedded fabric. The design provides low hydraulic resistance in the flow direction, while a soft seal between the valve and frame, as well as a wall seal, ensures reliable closure.A vertical steel reinforcement is mounted on the smooth PEHD flap to prevent buildup from surface and wastewater.KKL is made of corrosion-resistant materials, has no mechanical parts, and requires minimal maintenance.It opens easily in the direction of flow and seals securely against backflow.Applications: Low-pressure channels, protection against backflow and flooding.Operation: Automatic flap in rubber hinge. Technical specification Opening Pressure 121 mm HO (4.8 inh2o) Thickness Flange 35 mm (1.4 in) Weight 205 kg (451.9 lb) # Bolt holes (#B) 18 Dimension 1000 mm (39.4 in) Height 1300 mm (51.2 in) Height center opening (H2) 650 mm (25.6 in) Length closed 490 mm (19.3 in) Length Open (L2) 1180 mm (46.5 in) Width 1220 mm (48 in) Horizontal c-c (hcc) 150 mm (5.9 in) Vertical c-c (vcc) 150 mm (5.9 in) Ø Bolt Holes (ØB) 18 mm (0.7 in) Operating Temperature -25° C - +40° C Watertightness DIN 19569-4 table no. 1 Class 5 Valve body Polyethylene (PE) Flap Polyethylene (PE) Gasket EPDM Hinge Fiber Reinforced Sbr Product sheet (PDF) Technical specification (PDF) Dimensional drawing (PDF)