Supply valve arrangement for closed center hydraulic system

Details Supply valve arrangement for closed center hydraulic system Supply valve arrangement for closed center hydraulic system

F - Mech Eng,Light,Heat,Weapons

15

B

F15B 9/09 (2006.01) F15B 13/02 (2006.01) F15B 21/08 (2006.01)

Patent

CA 2101235

A hydraulic system includes a hydraulic pump which provides pressurized fluid at an output port as a function of pressure in a load sensing port, a hydraulic reservoir, and a load pressure sensing line connected to the load sensing port. A solenoid operated implement control valve controls fluid communication to and from a hydraulic function such as a cylinder. A supply control valve has a first position wherein the reservoir is communicated with the load sensing port and a second position wherein the pump output port is communicated with the load sensing port. A spring urges the valve member to its first position, and a solenoid is energizable to move the valve member to its second position. The solenoid is energized when the implement control valve is activated so that the supply control valve communicates pump pressure to the load sensing port and the pump will operate at full capacity whenever the second hydraulic function is operated.

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