Electromagnetic directional control valve
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United States of America Patent
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Apr 7, 1992
Issued Date -
N/A
app pub date -
Jun 28, 1990
filing date -
Apr 22, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A spool of a valve main body is switched and driven by exciting a solenoid coil by supplying a DC or AC voltage. An intensity of the magnetism generated by the excitation of the solenoid coil is detected by a magnetic sensor. When a predetermined sensor output is obtained, an indicator lamp is lit to indicate that the spool has operated correctly. The intensity of the magnetism due to the DC excitation is detected by magnetoresistive devices. The intensity of magnetism due to the AC excitation is detected by a pickup coil or a current transformer.
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