Ball Valve 2 : A valve with an internal ball that stops the water flow. Ball valves are used in many applications, such as in-line valves, hydrant gates and nozzles
Pacific Northwest Chapter of The Society for the Preservation and Appreciation of Antique Motorized Fire Apparatus in America SPAAMFAA, Fire Apparatus Terminology, La Center, Washington, USA 2002. (Fr Srvc - Amer) {455}