C504-70: AWWA Standard for Rubber-Seated Butterfly Valves (PDF)
SKU: STC_0074123-PDF
This standard covers cast-iron and ductile-iron body, rubber-seated, tight-closure butterfly valves, 3-72 in. in size, with various body types and body ends for maximum shutoff pressures and operating torques, and for freshwater having a pH greater than 6 and temperatures generally less than 125°F.
Description
The revisions included in this edition of the standard involve changes to Sec. 1.1, Sec. 9.4, Sec. 16, and Table 1B. The changes in Sec. 1.1 and Sec. 9.4 were for the purpose of minimizing corrosion of seating surfaces and to provide more adequate specifications for stainless steel. The revision of Sec. 16 provides for painting the interiors of valves with asphalt varnish under all installation conditions, not just for buried service, unless otherwise specified by the purchaser. In Table 113, the change in laying length of 14 in. wafer type valves brings this dimension into agreement with MSS SP-67 and military specifications issued by the Navy.