Combination check and flow control valve for hydraulic systems

Details Combination check and flow control valve for hydraulic systems Combination check and flow control valve for hydraulic systems

F - Mech Eng,Light,Heat,Weapons

16

K

137/56

F16K 15/00 (2006.01) F15B 13/01 (2006.01)

Patent

CA 1103127

COMBINATION CHECK AND FLOW CONTROL VALVE FOR HYDRAULIC SYSTEMS . ABSTRACT OF THE DISCLOSURE 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, connect- ing 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 com- bination 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 com- bination 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.

321362

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