Drive mechanism for a stopper in a molten metal vessel
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United States of America Patent
Stats
-
Jun 6, 1995
Grant Date -
N/A
app pub date -
Apr 13, 1994
filing date -
Apr 13, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A stopper drive mechanism is removably mounted on a molten metal vessel having a discharge opening and is adapted to move a stopper into and out of closing engagement with the discharge opening. A piston and cylinder unit of the stopper drive mechanism is operably connected with the stopper and has a valve unit connected thereto for controlling the piston and cylinder unit. The piston and cylinder unit comprises a cylinder that defines a working chamber with a piston slidably disposed therein. The piston has the same effective working area on opposite sides thereof. The valve unit comprises a control valve for controlling the flow of hydraulic fluid to and from the opposite sides of the piston and a bypass valve that is adapted to selectively communicate opposite sides of the piston with each other for manual movement of the stopper.
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