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Onyx Valve Series DBF
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Onyx Valve Series DBF


The Series DBF rubber check valve is a reliable solution for preventing backflow at the end of a pipe, ensuring mono-directional flow of challenging fluids such as slurries, sewerage, and sludge. This duckbill check valve features a flanged connection and a rugged, streamlined design that eliminates the mechanical parts prone to wear and jamming in conventional check valves. The elastomer duckbill is available in various materials to suit specific application needs.

The Series DBF valve's backup flange is constructed from galvanized carbon steel as standard, with 304 or 316 stainless steel options available for enhanced corrosion resistance. Onyx Valve Company manufactures all valve components in-house using state-of-the-art machining equipment, ensuring precise tolerances and consistent quality. This attention to detail results in a dependable, long-lasting check valve solution for demanding industrial applications.


  • Simple, rugged design eliminates wear-prone mechanical parts
  • Elastomer duckbill available in various materials for application-specific performance
  • Galvanized carbon steel backup flange (standard); 304 or 316 stainless steel options available
  • Low pressure drop minimizes energy consumption and operating costs
  • Corrosion-resistant materials ensure long service life
  • Frost-proof construction suitable for outdoor and low-temperature applications
  • Silent operation reduces noise pollution in the facility


  • Slurry handling systems
  • Sewerage and wastewater treatment plants
  • Sludge processing and transfer
  • Chemical processing facilities
  • Pulp and paper mills
  • Mining and mineral processing operations
  • Stormwater control systems
  • Tank overflow protection


  • Valve sizes available to suit various pipe diameters
  • Customizable elastomer materials for compatibility with specific fluids and operating conditions
  • Precision-machined components ensure tight sealing and reliable performance
  • Flanged connection allows easy integration into existing piping systems



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