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1. (WO1998053235) PROPORTIONAL PRESSURE CONTROL VALVE

Pub. No.:    WO/1998/053235    International Application No.:    PCT/JP1998/001290
Publication Date: Fri Nov 27 00:59:59 CET 1998 International Filing Date: Tue Mar 24 00:59:59 CET 1998
IPC: B60T 8/36
G05D 16/20
Applicants: SUMITOMO ELECTRIC INDUSTRIES, LTD.

OYAMA, Hitoshi

HASHIDA, Koichi

Inventors: OYAMA, Hitoshi

HASHIDA, Koichi

Title: PROPORTIONAL PRESSURE CONTROL VALVE
Abstract:
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).