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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.
RD Series Check Valve


2" through 24" flanged ends; 3" through 16" mechanical joint ends
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
Ductile iron domed access bonnet allows for easy removal and inspection of the flexible disc assembly
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
Constructed on a 45° angle to reduce the travel of the disc to the full open position; significantly reducing the potential for water hammer
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
Suitable for both horizontal and vertical pipelines with flow upward
The valve interior is fully coated with liquid thermosetting epoxy suitable for use in potable water service. The exterior is provided as standard with a universal primer enamel suitable for coating in the field. Special coatings can be furnished on request.
Disc position indicator
Complies with AWWA C508 Standards
NSF/ANSI 61/372 Certified