Electromagnetic valve device for hydraulic system has stroke boundary of electro-magnetic element varied so that use is made of constant force working stroke

摘要

The electromagnetic valve device has an electromagnetic element, retracted (1) when without power, and movable to extended position (2) when current is supplied. Its stroke to the extended position at constant magnetic force (F) is described as a constant force working stroke (AH). The stroke boundary of the electromagnetic element is varied so that use is made of the constant force working stroke.