公开(公告)号：EP1407843A1

公开(公告)日：2004-04-14

申请号：EP02728223.5

申请日：2002-06-03

申请人： Kubota Corporation

发明人： NAKAGAWA, Kenichi, KUBOTA CORPORATION ,  TSUCHIDA, Jiro, KUBOTA CORPORATION ,  YAMAGUCHI, Hiroshi, KUBOTA CORPORATION ,  MIURA, Mitsushige, KUBOTA CORPORATION ,  FUNAKOSHI, Jun, KUBOTA CORPORATION

IPC分类号： B22D35/00 ,  B22D17/02

CPC分类号： B22D39/023 ,  B22D17/10 ,  B22D17/30

摘要： In order to feed molten metal to a casting mold with precision while preventing introduction of metal oxide into a cylinder casing, an entire valve box 19 is disposed below a liquid level of the molten metal C inside a molten metal furnace D. A discharge duct 23 is upwardly open at a lower end of a valve-element moving space 24. An inlet duct 22 is open to the valve-element moving space 24 at a position higher than the discharge duct 23. Around an opening of the discharge duct 23 to the valve-element moving space 24, there is formed a lower receiving seat 29 in the form of a ring. A valve element 21 includes a lower contact portion 31 which comes into annular contact with the lower receiving seat 29 in association with a lowering movement of the valve element 21. The molten metal C inside the molten metal furnace D is introduced into a cylinder casing 4 by moving the valve element 21 to an inlet position where the lower contact portion 31 comes into the annular contact with the lower receiving seat 29 thereby to block communication between the discharge duct 23 and an inlet/outlet duct 8.