MSS SP-131-2010
The purpose is to provide a Standard Practice for metallic valves used in fuel gas piping systems which are manually operated both above and below ground.
This Standard Practice covers Metallic Gas Distribution Valves designed for operation at any pressure from 0 psig to a maximum of 285 psig, at operating temperatures ranging from -20F to 150F, and from sizes 1/2 to 12 NPS.