Solenoid valve with permanent magnet
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United States of America Patent
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-
Mar 13, 2001
Grant Date -
N/A
app pub date -
Jul 21, 1998
filing date -
Jul 21, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A solenoid valve comprises a first coil, a plunger, a first and a second opening in the valve, and a latching mechanism placed in association with the first opening. The latching mechanism causes latching, with a predetermined latching force, of the plunger to the first opening, and energization of the first coil along a predetermined first polarity causes at least a reduction of the latching force. The plunger has a first end towards the first opening and a second end towards the second opening, and a magnetic field extensor extends a first pole of the magnetic field produced by the first coil to the first end of the plunger. The extensor comprises a hollow cylindrical ferrous member terminated by a ferrous endpiece and is movable, with the plunger, relative to the first opening.
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