Electromagnetic proportional flow rate control valve
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United States of America Patent
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Apr 16, 2013
Grant Date -
Feb 17, 2005
app pub date -
Dec 9, 2002
filing date -
Dec 11, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
An electromagnetic proportional flow rate control valve capable of performing precise flow rate control in a low flow rate side of an operating region is provided. In an electromagnetic proportional flow rate control valve 32, in which a valve member 2 is driven in a valve closing direction in accordance with the increase in a driving current I of a solenoid coil 15, a solenoid driving force F is set such that it decreases accompanying the displacement of the valve member 2 in the valve closing direction with respect to an identical driving current in the solenoid coil 15. Thus, an amount of change in an area of a valve opening with respect to unit changes in the driving current I becomes smaller in a region at which the stroke is small compared to a case of having flat characteristics, whereby the flow rate control precision in the low flow rate region can be improved.
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