Railroad tank car ball valve
作者： Edwin S Carlson
DOI:
关键词:
摘要: A railroad tank car has a ball valve operable from its underside mounted within the in manner that permits complete drainage.
lens.org 参考文章(4)
Otto F Widera, Art of manufacturing ball valves ,(1963)
Nordstrom Sven Johan, Valve for tank cars and the like ,(1922)
William S Penfield, Hydraulic safety valve, especially adapted for tank trucks, tank cars, and the like ,(1924)
George A Piel, Tank bottom flush valve ,(1965)