In order to regulate the flow of fluid in a hydraulic system it is known to provide a flow regulating valve having inlet and outlet ports connected in the line and having a slidable valve element cooperating with the ports to define a variable flow passage therebetween, the rate of fluid flow depending upon the position of the valve element with respect to the ports. The valve element is normally biassed in a direction tending to close the variable flow passage and is displaceable against its bias to open the flow passage by a selected amount. For controlling the displacement of the valve element a pilot valve may be employed for supplying a control fluid to a pilot chamber on one side of the valve element, the positioning of the element being determined by the pilot chamber pressure and the force exerted by the biasing means.
USPTO Backgrounds
USPTO Backgrounds