This Standard Practice establishes material@ surface finish@ dimensional@ and testing requirements for preformed V-ring packing sets@ packing chambers@ and valve stems. This Standard Practice applies to homogeneous elastomeric and polytetrafluoroethylene (PTFE) V-ring packing for gray iron and ductile iron quarter-turn and multi-turn valves for waterworks applications with a maximum service temperature of 150 ??(66 ??.
SP-149-2015由MSS - Manufacturers Standardization Society of the Valve and Fittings Industry. 发布于 2015-01-01,并于 2018-12-26 实施。
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