Rubber Duckbill Check Valve Flanged Wastewater Backflow Preventer

A flexible rubber sleeve opens under forward differential pressure and closes flat when flow stops, with no metal hinge or external moving parts. Fabric reinforcement and flange dimensions are selected for tidal, drainage or outfall service. This duckbill check valve is designed for outfalls, drainage, seawater and flood protection and is available in DN50–DN2000 with Flanged or Slip-On connections. Body and trim materials, seat or seal system, operating characteristic, actuator, coating and inspection documentation can be configured to the actual pressure, temperature, medium and project specification. Where applicable, manual, pneumatic, electric, hydraulic or self-operated configurations are available. Shell and seat testing, dimensional inspection and material traceability records can be provided with the order.