Historical
MSS SP-120-2017
Flexible Graphite Packing System for Rising Stem Valves
This Standard Practice is applicable to valves that use flexible graphite packing stem sealing to achieve reduced or low emissions. This Standard Practice encompasses dimensions and tolerances applicable to ASME B16.34 gate and globe valves designed with rising non-rotating and rising rotating stems. This Standard Practice applies to valves in which a flexible graphite packing assembly is used as the primary stem-sealing system.
Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. [mss]
