Two-stage variable force solenoid
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United States of America Patent
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-
Mar 21, 2017
Grant Date -
Dec 19, 2013
app pub date -
Feb 24, 2012
filing date -
Feb 28, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A two-stage, variable force, solenoid control valve for regulating fluid pressure can include a valve body having a pilot fluid passage, including a metering land, in fluid communication with a flow amplifying fluid passage through a valve control port formed in the valve body. A solenoid operated pilot valve member, disposed in the pilot fluid passage can have a metering orifice operable in combination with the metering land for selectively connecting the valve control port with a pressurized fluid supply port and a return exhaust port in response to activation of a solenoid. A flow amplifying spool valve member, in fluid communication with the valve control port of the pilot valve member at one end, can selectively connect a load control port with the pressurized fluid supply port and the return exhaust port in response to pilot valve member operation.
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