Historical
MSS SP-120-2011
Flexible Graphite Packing System for Rising Stem Valves - Design Requirements
This Standard Practice establishes material and dimensional requirements for valve packing, packing chamber, packing gland, packing washer, bonnet, and the stem, as they relate to the total packing assembly
Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. [mss]