PROPORTIONAL CONTROL SOLENOID VALVE

摘要

Provided is a configuration in which: a spool (5) driven by an electromagnetic proportional solenoid (3) is urged by a spool-returning spring (4) configured to exert urging force in an opposite direction to a driving direction (V) of the electromagnetic proportional solenoid (3); a mechanical stopper (11) is disposed at the stroke end of the spool (5); current dither causes a control current to micro-vibrate, the control current driving the electromagnetic proportional solenoid (3); and the mechanical stopper (11) includes a stopper-urging spring (12) configured to allow the spool (5) to vibrate owing to the current dither even when the spool (5) is in contact with the mechanical stopper (11). A proportional solenoid control valve with this configuration is capable of reducing hysteresis at the stroke end of the spool (5) by means of the current dither, and controlling the spool (5) in a stable manner over the entire control range including the stroke end of the spool (5).