RD-Series®

Check Valve

The Pratt® RD-Series Check Valve has only one moving part: a resilient disc reinforced with steel. This simple, innovative valve provides dependable, maintenance free performance, and quiet operation with its inherent non-slam construction. The large, unobstructed flow path makes the valve an excellent choice for wastewater as well as water applications. The design has undergone a rigorous 1,000,000 continuous cycle test with no signs of wear or distortion to the valve disc or seat. All sizes have a 250 psi rating.

Specifications:

• Sizes:
  • 2″ through 24″ flanged ends
  • 3″ through 16″ mechanical joint ends
• Body: Ductile Iron in ASTM A-536 Grade 65-45-12, and features a full flow area providing 100% unrestricted flow and low head loss. Flanges are in full compliance with ANSI B16.1, Class 125.
• Bonnet: Ductile iron domed access bonnet allows for easy removal and inspection of the flexible disc assembly.
• Disc: The only moving part, featuring a fully Buna-N encapsulated steel disc with nylon reinforcement in the flex area. The molded elastomer with integral O-ring ensures a bubble-tight shut off, without backflow.
• Seat: Constructed on a 45° angle to reduce the travel of the disc to the full open position; significantly reducing the potential for water hammer.
• Flow: The flow area is equal to or greater than the equivalent pipe size throughout, resulting in low head losses, compared to other types of check valves.
• Installation: Suitable for both horizontal and vertical pipelines with flow upward.
• Coatings: The valve interior and exterior is fully coated with fusion bonded epoxy coating suitable for use in potable and waste water services.
• Accessories/Options:
  • Disc position indicator
  • External backflow device – to manually open disc
  • Proximity limit switch – to transmit an electrical signal to indicate when disc is open or closed
  • EPDM disc option
  • Stainless steel cover bolts
• Complies with AWWA C508 Standards
• NSF/ANSI 61/372 Certified