Electromagnetic valve
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United States of America Patent
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Feb 21, 1989
Grant Date -
N/A
app pub date -
May 10, 1988
filing date -
May 11, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electromagnetic valve for use for discharge of molten metal from a container, comprises a main body providing a discharge passage through which, in use, molten metal will flow; and electrical induction coil located about the passage; means to supply an alternating electric current to the coil whereby the coil provides an alternating magnetic field which induces electric currents in any molten metal in the passage; and a center member located in the passage, the arrangement being such that interaction between the magnetic field provided by the coil and the currents induced in the molten metal in the passage provides a force which as it is increased causes the flow rate of the molten metal through the valve to be reduced until the force is sufficient to urge the molten metal away from the wall of the passage until the molten metal is supported on the center member and the flow of molten metal is cut off. The valve is also arranged to provide mixing of molten metal in the discharge passage with that in the container in order to prevent superheating or freezing of metal in the discharge passage.
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