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Swing check valves are of self-contained, free-swinging disc style, allowing a clear
waterway. Valve disc swings freely open and is keyed to valve hinge pin without the use
of pins. Valves conform to all standards set forth in AWWA C508, Latest Edition.
Valve hinge pins are Stainless Steel and conform to the industry standards set forth for
cushion valves. Manufacturer should have a minimum of ten years experience supplying
air cushion AWWA C508 valves.
• ANSI B16.1: Cast Iron Pipe Flanges and Flanged Fittings Class 125
• AWWA C508: Swing Check Valves for Waterworks Service, 2” through 24”
Valves are rated for 150psi and 175psi water working pressure. Valves are available in
ductile iron for high pressure applications. All testing is done in accordance with
Valves have integrally cast flat face flanges in accordance with ANSI B16.1 Class 125.
• All cast iron used conforms to ASTM A126 CLB
• Disc is of ductile iron conforming to ASTM A536 GR65-45-12
• Hinge Pins conform to ASTM A276 GR304
• Seat Rings are of low Zinc Bronze conforming to ASTM B62 or of Stainless Steel
conforming to ASTM A276 GR316
Internal and external coatings are two-component epoxy conforming to AWWA C550.
All valves meet the standards of AWWA C508. All valves utilize a single disc mounted
to a clevis hinge which prevents the disc from tipping. The valve disc swings open once
the pump starts and allows for full flow. When closed the valve offers a tight shut-off.
Valve body and cover are of Cast Iron; valve hinge is of Ductile Iron. Disc seating
surface is either Bronze, Stainless Steel, or of Buna-N depending on application. Valve
seat rings are of Bronze or Stainless Steel.
The valve body has a bolted cover design and flanges are integral to body casting – not
wafer style. Valve body and disc are designed in such a way as to minimize turbulence.
Spring and cushion systems are externally mounted on the side of the body and do not
come into contact with main line media.
Cushion systems are one-piece all bronze construction with integral pad mounted directly
to the body with stainless steel fasteners. Air cushion shall consist of bronze and
stainless steel components, be adjustable by means of a flow control valve and piston
sleeve. Air cushion shall be totally enclosed with a metal end cap with an o-ring.
All valves are built for horizontal installation. However, all valves operate equally well
in vertical installations. Prior to valve installation, Pratt should be notified of vertical
mounting position so lever arm and weight can be properly positioned on valve.