Mueller Butterfly Valve AWWA C504 Class 150B For Buried Service

All butterfly valves shall be manufactured in accordance with the latest revision of AWWA C504 for Class 150B service and comply with the following details:

Valve Bodies shall be constructed of cast iron ASTM A-126 Class B and conform to AWWA C504 in terms of laying lengths and minimum body shell thickness. End connections shall be as specified on the plans.

Valve Discs shall be made of stainless steel ASTM A-351 Grade CF8M (3"-6"), cast iron ASTM A-126 Class B (8 "-20"), sizes 24" and larger shall be built from ductile iron in conformance to ASTM A-536 (65-45-12). Disc shall be furnished with 316 stainless steel seating edge to mate with the rubber seat on the body.

Valve Seats shall be Buna N rubber located on the valve body. In sizes 20" and smaller, valves shall have bonded seats that meet test procedures outlined in ASTM D-429 Method B. Sizes 24" and larger shall be retained in the valve body by mechanical means without use of metal retainers or other devices located in the flow stream.

Valve Shafts shall conform to stainless steel ASTM A-276 Type 304. Shaft seals shall be standard self-adjusting,

Chevron V-Type packing. Shaft seals shall be of a design allowing replacement without removing the valve shaft.

Valve Bearings shall be sleeve type that are corrosion resistant and self-lubricating. Bearing load shall not exceed 1/5th of the compressive load strength of the material.