The Manufacturers Standardization Society of Vienna, VA, has announced the publication of a new standard, MSS SP-156-2019, Ductile Iron, Metal-Seated, Non-Lubricated, Eccentric Plug Valves.
This Standard Practice involves requirements for ductile iron, metal-seated, non-lubricated, eccentric plug valves with flanged, mechanical joint, grooved or shouldered ends. It includes applicable eccentric plug valves in sizes and pressure-temperature ratings specified for general-purpose service. Conditions of water hammer, hydraulic pulsation, and excessive operating noise are the result of system design rather than valve design and require special design and construction considerations.
This Standard Practice also includes, directly or by reference, identified stipulations on chemical and mechanical material properties, dimensions and classes (designations) of end connections, valve pressure and temperature ratings, workmanship, testing, coating, marking, and preparation for shipment.