The DFT® Excalibur® NAB (Nickel-Aluminum Bronze) Silent Check Valve is a spring-assisted, nozzle style, non-slam check valve that is designed to withstand the harsh environments of salt and brackish water applications where corrosion resistance and marine life deterrents are a must. DFT®'s center guided check valves provide reliable, low-maintenance service and solve the problems associated with water hammer and severe applications and environments.
Unit of Measure



N/A ASME B16.10 ASME Class 150 & 300

Line Size

N/A 2 to 24 in


N/A Nickel-Aluminum Bronze

Trim Material

N/A Duplex Stainless Steel Monel® Nickel-Aluminum Bronze Stainless Steel


N/A Butt Weld End Flanged x Butt Weld End Flat Face Flanged End Raised Face End



  • ASME B16.10 Face-to-Face dimensions
  • Spring-assisted silent closing, non-slam
  • 2" to 24" Line size
  • ASME Class 150 & 300
  • Standard body materials:
    • Nickel-Aluminum Bronze
  • Standard ends:
    • Flat face flanged
  • Optional ends:
    • Butt weld
    • Flanged x Butt weld
    • Raised face
  • Center-guided
  • Dual-guided stem
  • Horizontal or vertical installation
  • Tight shutoff
  • Two-piece body
  • Protected spring
  • Easy maintenance
  • Versatile
  • Axial flow
  • Nozzle style
  • Options:
    • Soft seat
    • Inconel® X-750 Spring
    • Custom sizing low flow
    • Severe service trim
    • Stellite® trim
  • Trim Options:
    • Nickel-Aluminum Bronze
    • Monel®
    • Stainless Steel
    • Duplex SS