Title:
CHECK VALVEECOMBINED FLOW CONTROL VALVE FOR HYDRAULIC SYSTEM
Document Type and Number:
Japanese Patent JPS54140067
Kind Code:
A
Abstract:
A hydraulic system including a hydraulic pump, a hydraulic motor having at least one port and a hydraulic reservoir. A main spool valve is interposed between the motor and the pump and reservoir and has a spool shiftable between positions connecting the pump to the port, connecting the reservoir to the port, and blocking fluid flow to or from the port. A single combination check and flow control valve is interposed between the main spool valve and the port. A fluid responsive surface opens the combination valve to permit relatively free flow of fluid therethrough when the spool is in the first mentioned position thereof. A pressure responsive surface and a control valve provides for partial opening of the combination valve to meter fluid flow therethrough when the spool is in the second position thereof. A spring is operative to close the combination valve to prevent fluid flow therethrough when the spool is in the last mentioned position thereof.
Inventors:
HAWAADO REITON JIYONSON
Application Number:
JP4370379A
Publication Date:
October 30, 1979
Filing Date:
April 12, 1979
Export Citation:
Assignee:
CATERPILLAR TRACTOR CO
International Classes:
F15B11/08; F15B13/01; (IPC1-7): F15B11/08