Patent ID: 6098403
Filing Date: 2000-08-08
Classification: F15B,Y10T

Abstract:
In a hydraulic system having an array of valve sections or controlling flow of hydraulic fluid from a pump to a plurality of actuators, the pump produces an output pressure that is a function of pressure at a control input, and each valve section having a workport to which one of the plurality of actuators connects and having a spool with a metering orifice that is variable to regulate flow of the hydraulic fluid from the pump to the one actuator; the improvement comprising:each valve section having a poppet slidably located in a bore thereby defining first and second chambers on opposite sides of the poppet, the first chamber communicating with the metering orifice and the second chamber connected to the control input of the pump, the bore having an inlet that receives a pressure which is dependent upon the output pressure of the pump, a spring biasing the poppet to open a path between the inlet and the second chamber; andwherein movement of the poppet within the bore controls flow of hydraulic fluid between the inlet and the second chamber.