公开(公告)号：US3584647A

公开(公告)日：1971-06-15

申请号：US3584647D

申请日：1969-07-31

Applicant: ROBERT E BROWN

Inventor： BROWN ROBERT E

IPC: F15B13/043 ,  F16K11/20

CPC classification number: F15B13/0431 ,  Y10T137/87201 ,  Y10T137/87209 ,  Y10T137/87241

Abstract: An oppositely spring loaded spool-type valve is also pilotpressurized oppositely to control pressure liquid flow past three ball checks and through associated external lines to two hydraulic load actuating cylinders. One of these is a doubleacting cylinder selectively pressurized at its opposite ends, and the other is a single-acting, spring return cylinder pressurized at only one end, these cylinders being parts of an external system controlled by the valve. Three two-way solenoid actuated valves are operated under the control of pushbutton switch means to govern the voiding of hydraulic liquid from the respective cylinder ends in certain phases of the operation of the valve; and hydraulic operating pressure is supplied by a motor powered pump. The operation of the pump is also responsive to pushbutton switch operation, whether by itself along or conjointly with the operation of the pressure-dumping solenoid valves, in the said certain phases of operation. The pump pressurizes a valve manifold with which three ball check-governed passages are placed in communication under control of the valve spool.