Directional valve
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United States of America Patent
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Mar 25, 2003
Grant Date -
N/A
app pub date -
Apr 14, 2000
filing date -
Apr 27, 1999
priority date (Note) -
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Abstract
A directional valve for respiratory devices has a valve body and a valve seat whose contact surface with the valve body is primarily horizontal. In order to enhance and reinforce the directional valve's operation, the valve body contains a ferromagnetic material, preferably permanently magnetized, a coil is magnetically couplable to the valve body, a source of current is connected to the coil, and a control unit controls the source of current in order to regulate current through the coil to magnetically couple the coil to the valve body, in one or both of the closing and opening directions.
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