American Rotating Disc (ARD) ARD is the manufacturer of the American Darling Double Disc Gate Valve. This valve has been in production since the beginning of the 1900's. To order please call 1-770-591-4622 Double Disc Gate Valves Sizes: Rating: Applications: Standard: 3" through 72" 250 PSI Water, Wastewater, Raw Water, Sewage AWWA C-500 Attributes: • • Ductile Iron Body/Bonnet The only double disc valves that are self cleaning as they rotate up and down © 2007 Charles Finch Valve. All rights reserved. To order please contact 770.591.4622