PROPORTIONAL PRESSURE CONTROL VALVE

摘要

A proportional pressure control valve which is simplified and reduced in cost and in which a spool is driven by an electromagnet and load pressures are controlled in accordance with an exciting current for the electromagnet. A spring (3) biases a spool (2) via an acting element (12) of an electromagnet (11) to reduce the number of springs to one. Also, a reaction piston (4) is provided on a side of a low pressure chamber (11) to eliminate the need of boring in a functionally important portion of the acting element (12), and a load pressure is made to act on the spool (2) in a direction, in which forces of the electromagnet (11) is assisted. Further, the acting element (12) is made integral with the spool (2), and so any sliding portion is eliminated from the acting element (12).