SP-108-2002

Resilient-Seated Cast-Iron Eccentric Plug Valves

This Standard Practice covers 1/4 turn eccentric cast iron plug valves having flanged, threaded, mechanical joint, or grooved end connection. This standard is intended for resilient seated valves with circular, rectangular, or other geometric seat configuration having no visible evidence of leakage. The size range covered is NPS 3 through 72. 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.