专利名称：BUTTERFLY VALVES 发明人：PETER WALTON
申请号：AU1692270高校录取分数线
带有月亮的诗句>当尼采哭泣申请日：19700629
公开号：AU1692270A
公开日：特别的礼物作文
冬天的景色简笔画
19720106
磁电式电流表
夜游专利内容由知识产权出版社提供
摘要：1315955 Valves SERCK INDUSTRIES Ltd 16 June 1970 [22 Sept 1969] 46486/69 Heading F2V A butterfly valve compris a disc having a part-spherical periphery 21 and cut-away portions 22, 23 around the periphery which form part of the surface of a toroid so that over part of the angular rotation of the disc substantially the whole of the flow takes place through the opening defined by the cut-away portions. The disc may have recess (51, 52) (Fig. 6, not shown) which enables fluid to apply an opening torque.
申请人：SERCK INDUSTRIES LIMITED包头海拔
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