Specifications include, but are not limited to: Unless otherwise indicated on the Drawings or directed by the Engineer, butterfly valves shall be used on all water mains 12 inches in diameter and larger. Valves shall be NSF61 certified and be designed for buried service. The size and location of valves shall be as shown on the Drawings. Valve ends shall be MJ type, conforming to AWWA C111/ANSI A21.11. All butterfly valves shall be minimum 200 psi, cast iron body, configured with a horizontal valve shaft and a vertical actuator shaft with 2-inch square operating nuts painted red, clockwise to open. Butterfly valves shall be fitted with Buna-N seats, type 304 or 316 stainless steel shaft, cast iron disc with 316 stainless steel edge disc, and nylon self-lubricating shaft bearings, conforming to AWWA C504 Class 150B, and epoxy coated inside and outside conforming to AWWA C550. Valve discs shall seat at 90 degree with the pipe axis. All exposed valve bolts and nuts shall be 304 or 316 stainless steel with PTFE coated nuts conforming to ASTM 276. Valve operators shall be designed for buried service, totally enclosed, permanently lubricated link lever traveling nut type designed to hold the valve in any intermediate Section 8 – Water Mains, Fire Lines and Services 8 - 8 REVISED 2022 position between full-open and closed. Operators shall meet all minimum standards of AWWA C504. Operator shall be provided with a stop-limiting device capable of withstanding input torque of 300 ft-lbs at extreme operator positions without damage to operator or valve.
