专利名称：Hydraulic control system发明人：Nicholas C. Blume申请号：US05/842453申请日：19771017公开号：US04129987A公开日：19781219
摘要：The disclosure is directed to a closed center, pressure compensated hydraulicsystem which uses a multiple section hydraulic control valve in conjuction with a variableoutput hydraulic pump. The hydraulic control valve has a plurality of independentlyoperable power spools each of which is used to control the flow of hydraulic fluid to aseparate hydraulic actuator and load. Each valve section includes an automatic spoolpositioner which enables the operator to move the valve handle to a preselectedposition, the power spool thereafter being retained in such position until the actuatorcompletes its stroke. After completion of the stroke, the automatic spool positionercauses the power spool to return to the neutral position. The multiple section hydrauliccontrol valve also includes means for selecting the highest demand or work portpressure, and for controlling the variable output pump as a function of this selectedpressure.
申请人：GRESEN MANUFACTURING COMPANY
代理机构：Merchant, Gould, Smith, Edell, Welter & Schmidt
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