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About This Item

 

Full Description

SCOPE

1.1 This Standard Practice is applicable to valves that use flexible graphite packing stem sealing to achieve reduced or low emissions.

1.2 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.

1.3 This Standard Practice applies to valves in which a flexible graphite packing assembly is used as the primary stem-sealing system.

1.4 Valves that include a lantern ring as part of its packing system, and bonnetless valves with split glands, are outside the scope of this Standard Practice.
 

Document History

  1. MSS SP-120-2017

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    Flexible Graphite Packing System for Rising Stem Steel Valves

    • Most Recent
  2. MSS SP-120-2011


    Flexible Graphite Packing System for Rising Stem Steel Valves - Design Requirements

    • Historical Version
  3. MSS SP-120-2006


    Flexible Graphite Packing System for Rising Stem Steel Valves - Design Requirements

    • Historical Version
  4. MSS SP-120-2002


    Flexible Graphite Packing System for Rising Stem Steel Valves - Design Requirements

    • Historical Version
  5. MSS SP-120-1997


    Flexible Graphite Packing System for Rising Stem Steel Valves (Design Requirements)

    • Historical Version