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MSS SP-149-2015 Preformed Elastomeric and Polytetrafluoroethylene (PTFE) V-Ring Packing Sets for Waterworks Valves
standard by Manufacturers Standardization Society, 2015
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Scope: 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 F (66 C).