The KVD 450 flap valve installs in piping systems to prevent backflow, such as at outlets to channels or pump stations. Its 15° inclined flap with a robust rubber hinge provides low hydraulic resistance in flow direction while ensuring reliable closure in case of backflow. Made of corrosion-resistant materials, it requires minimal maintenance and allows straightforward installation. Technical specification Nominal diameter DN/OD 450 (NPS/OD 18) Opening Pressure 59 mm HO (2.3 inh2o) Pressure 5 m HO (16.4 fth2o) Weight 27 kg (59.5 lb) # Bolt holes (#B) 20 Bolt Circle Diameter (BCD) 565 mm (22.2 in) Height center opening (H2) 307.5 mm (12.1 in) Total Height (Ht) 627 mm (24.7 in) Valve body length (L) 586 mm (23.1 in) Length Open (L2) 935 mm (36.8 in) Outer Ø (OD) 450 mm (17.7 in) Width 615 mm (24.2 in) Ø Bolt Holes (ØB) 26 mm (1 in) Flange bolt pattern Hole Pattern Acc. to ISO 2084-1974 (E), PN10 Operating Temperature -25° C - +40° C Watertightness DIN 19569-4 table no. 1 Class 5 Valve body Polyethylene (PE) Flap Polyethylene (PE) Flap seal EPDM Product sheet (PDF) Technical specification (PDF) Dimensional drawing (PDF)