Spears® Butterfly Valves are designed for installation with user supplied 1/8" full-faced gaskets, hex bolts, nuts and flat washers. Caution: Spears® Butterfly Valves are designed for use with flanges or flanged equipment having minimum waterway inside diameter no less than that of Schedule 80 PVC pipe (ASTM D 1785).. CAUTION: Dimensions provided for flange bolting are intended only as a guide. Bolt lengths may vary due to manufacturing tolerances in valves, gaskets, flange bolts, and flanges. ZSPEC resilient seated butterfly valves are designed to fit between ANSI B16.5 class 150 flanges without flange gaskets. Since inside flange diameters vary depending.

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Lengths for Two Flanges & One Wafer Butterfly Valve (per API 609 dimensions) • Material: Carbon Steel • Finish: Zinc Plated • Sizes: 2" to 12" Standards • Bolts: Material - ASTM A307A Grade A Dimensions - ASME B18.2.1 Thread - Class 2A • Nuts: Material - SAE J995 Grade 2 Dimensions - ASME B18.2.2 Thread - Class 2B. Bolt Properties. Gasket thickness of 0.06 inches. Minimum thickness flange thickness of weld neck flanges per ASME B16.5. ** Special length required for tapped blind holes on either side of valve shaft at the top and bottom ends of the valve body. Flow Line Valve and Controls, L.L.C. 110 Main Project Rd · Schriever, LA 70395 · Phone: 985-414-6004 · Toll Free.