thc disc will project beyond the body faces when the disc is turned. Note: For lug- and wafer-type valves and some double flanged designs. and the criteria covered in the appendix to this standard. The manufacturer shall design the valve disc to provide suitable clearance, in accordance with the ASME class rating for the salve, the inside diameter of the connecting pipe or Ilange. Note 2: Valves with liners that extend to the gasket scaLing surfaces should be bolted up with the disc in the partially open position.Ĥ.3.2 Facc-to-facc dimensions for doubic flanged valves are listed in Table 2-B for long pattern valves, or Table 2-C for short pattern valves.Ĥ.3.3 Body contact faces of cast iron, ductile iron, and cast copper alloy valves that require separate gaskets shall be tinished as specified in MSS SP-6.Ĥ.3.4 Body contact faces of steel or alloy valves that require separate gaskets shall be finished as specified in ![]() ![]() sleeves, or 0-ring seals act as flange-sealing surfaces, separate gaskots shouki not he used unless specifically recommended by the manufa.iurer. ![]() API 609:2004 pdf download.Butterfly Valves: Double Flanged, Lug- and Wafer-Type.
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