Energizing circuit for solenoid valve
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United States of America Patent
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-
Jan 20, 1981
Grant Date -
N/A
app pub date -
Jul 12, 1978
filing date -
Jul 15, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An engergizing circuit for a solenoid valve has a power source connected to a solenoid coil of the solenoid valve through on-off contacts. The energizing circuit includes a capacitor and a solid-state surge absorber which are respectively connected in parallel with the solenoid coil, and the surge absorber is made from a sintered material containing a metal oxide as a principal component and having a non-linear electric resistance characteristic with respect to the applied voltage. By virtue of the solenoid valve energizing circuit constructed as described, when the on-off contacts are separated, the occurrence of an arc between the contacts thus preventing wear of the contacts, while when the solenoid coil is deenergized, the delay time in the return movement of the valve spool is decreased, and moreover the surge voltage produced across the ends of the solenoid coil upon its deenergization is controlled to a predetermined low voltage.
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