Retractable spacer ring for valve seats
作者： Robert P Dumm
DOI:
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摘要:
lens.org 参考文章(4)
Robert P Dumm, Manual latch to retract a packing assembly ,(1961)
Grove Marvin Henry, Valve construction having provisions for valve seat access ,(1960)
Homer J Shafer, George T Johnson, Removable sealing construction for valves ,(1960)
Hartmann Dipl-Ing Werner, Hahn mit kugelfoermigem Kueken und im Gehaeuse verschiebbar angeordneten Abdichtringen ,(1961)