The EVR Flanged Series Rubber Duckbill Check Valve is engineered for reliable backflow prevention across a variety of water and wastewater applications. Its flange-mounted design allows for direct connection to piping systems, offering a cost-effective and low-maintenance solution for handling corrosive or abrasive flow media. The duckbill-shaped elastomer sleeve automatically opens with positive flow and seals tightly to prevent reverse flow, even under low-pressure conditions.
No mechanical moving parts
Self-sealing elastomer design
Corrosion and clog-resistant
DN 50 to DN 1800 (2” to 72”)
Elastomer (Natural Rubber, EPDM, Neoprene, Nitrile, etc.)
Vertical or horizontal
Zero backflow with self-closing duckbill design
Flanged (ANSI, DIN, BS or JIS standards)
Carbon Steel, Stainless Steel, or FRP
Up to 10 bar depending on size and application
No lubrication or maintenance required
Wastewater treatment plants
Stormwater discharge systems
Flood prevention in drainage systems
Industrial effluent discharge
Marine and outfall installations
Raw sewage
Sludge and slurries
Seawater and brine
Industrial chemicals
Stormwater and surface water
Operates in submerged conditions
Opens under minimal head pressure
Custom-built for high flow or large diameter applications
Resistant to corrosion, UV, and biological fouling
Backing rings (stainless steel or FRP)
Protective coatings for aggressive media
Installation gaskets and hardware sets
Integral flap cover for surface protection
From forging and casting to machining, assembly, and testing — every step is managed under one roof to ensure consistent quality, faster lead times, and zero compromise.
Get in touch with our team for additional information on product pricing, technical data, project support and more.
