Most recent
ANSI/MSS SP-144-2020
Pressure-Seal Bonnet Valves
This Standard Practice covers construction requirements for steel and alloy valves having pressureseal bonnets in the size range of NPS 2 (DN 50) through NPS 50 (DN 1250) and Pressure Classes 600, 900, 1500, 2500, and 4500. This Standard Practice applies to gate, globe, and check valves and may be used in conjunction with other valve-specific standards; including the following identified in this Standard Practice as parent valve standards: API 594, Check Valves; Flanged, Lug, Wafer, and Butt-Welding, API 600, Steel Gate Valves – Flanged and Butt-Welding Ends, Bolted Bonnets, API 603, Corrosion-Resistant, Bolted Bonnet Gate Valves – Flanged and Butt-Welding Ends, API 623, Steel Globe Valves – Flanged and Butt-Welding Ends, Bolted Bonnets, ASME B16.34, Valves-Flanged, Threaded, and Welding End.
Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. [mss]