EPDM Duckbill Non Return Valve DN600 PN16 Weather Resistant

DN600 PN16 Weather Resistant Rubber EPDM Flanged Duckbill Non Return Valve

The flange duckbill valve utilizes a rubber duckbill structure to achieve one-way check functionality. Installed in pipeline systems via flange connections, it primarily prevents fluid backflow.

• Valve body: Typically metal (cast iron, carbon steel, stainless steel) with flange interface
• Duckbill part: Elastic rubber material (NBR, EPDM, neoprene) with flat duckbill shape that opens and closes with fluid pressure

• Forward flow: Fluid pressure opens the duckbill allowing medium passage
• Reverse flow: Duckbill closes under back pressure, using elastic seal to prevent backflow (similar to one-way check valve)

Valve body material: Cast iron, ductile iron, 304/316 stainless steel (selected based on medium)

• No mechanical parts: Relies on rubber elasticity for simple structure and low failure rate
• Self-cleaning design: Impurities are flushed during opening/closing, suitable for media containing particles and fibers
• Low head loss: Smooth flow channel when fully open reduces pressure

• Drainage systems: Municipal rainwater and sewage pipe networks, pump station outlets
• Industrial fields: Corrosive medium transportation in chemical and paper mills
• Environmental protection engineering: Seawater desalination, anti-backflow at sewage treatment plant discharge outlets