While you may find unofficial copies on file-sharing sites, these often contain outdated revisions or scanning errors that can lead to critical engineering mistakes.
: MSS SP 99 provides detailed requirements for valve design, including dimensions, pressure ratings, and bellow specifications. The bellow's design is critical as it must ensure leak-tightness. mss sp99 pdf
Used for throttling and isolation in specific process conditions. While you may find unofficial copies on file-sharing
Unlike standard industrial valves, instrument valves (such as needle valves, ball valves, and manifold valves) are designed for smaller bore applications, often for pressure gauges, transmitters, and other instrumentation. instrument valves (such as needle valves
Often include guidance on installation, bolt torqueing, and material selection.
: Applies to needle, packless, ball, plug, check, and manifold valves.