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Valve & Fitting Standards
Manufacturers Standardization Society
of the Valve and Fittings Industry
SP-120-2006, $134.00
Flexible Graphite Packing System for Rising Stem
Steel Valves (Design Requirements)
This MSS Standard Practice provides packing material
and dimensional requirements for valve packing, packing chamber, packing
gland, packing washer, bonnet, and stem as they relate to the total packing
assembly. It applies to standard, special, and limited Class 150 through
Class 4500 (including intermediate classes) ASME B16.34 type steel gate,
globe, and angle valves designed with rotating/rising, and non-rotating/rising
stems. It applies to valves in which a flexible graphite packing assembly
is used as the primary stem sealing system. It does not apply to valves
that include a lantern ring as part of its packing system nor to bonnetless
valves with split glands.
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