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About This Item


Full Description

MSS SP-143-2018 establishes the minimum requirements for the application, design and installation of live-loaded stem packing systems for valves designed in accordance with ASME B16.34, having rising and/or rotating stems. It applies to valves with flexible graphite, polytetrafluoroethylene (PTFE), expanded polytetrafluoroethylene (ePTFE), or other packing stem seal material, regardless of frequency of operation.

This Standard Practice does not apply to valves that include a lantern ring(s) as part of its packing system or to self-energized packing.

Document History

  1. MSS SP-143-2018


    Live-Loaded Valve Stem Packing Systems

    • Most Recent
  2. MSS SP-143-2012

    Live-Loaded Valve Stem Packing Systems

    • Historical Version