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MSS SP-120-2024

Flexible Graphite Packing Sealing for Rising Stem Valves

This Standard Practice is applicable to isolation valves that use flexible graphite compression packing stem sealing to achieve reduced or low emissions. This Standard Practice also encompasses dimensions and tolerances applicable to ASME B16.34 gate and globe valves designed with rising non-rotating and rising rotating stems. Quarter-turn valve designs are outside the scope of this Standard Practice; and is applicable to valves in which a flexible graphite compression packing assembly is used as the primary stem-sealing system.

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Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. [mss]

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