This Standard Practice covers quarter-turn eccentric cast iron plug valves having flanged, threaded, mechanical joint, or grooved end connections. This Standard Practice is intended for resilient seated valves with a circular, rectangular, or other geometric seat configuration, having no visible evidence of leakage. The size range covered is NPS 3 through NPS 72 (DN 80 through DN 1800). Typical applications are sewage, sludge, waste water, and water service. The manufacturer should be consulted for other applications.

Conditions of water hammer, hydraulic pulsation, and excessive operating noise are results of the system design rather than valve design and require special design and construction considerations.