Examples Using Load-Sensing Hydraulic System-Power-Beyond

Example 1 -Control valves with a load-sense provide a load-sense signal to hydraulic system and can be operated manually or by solenoids.

Example 2 -Control valve directs oil into extend or retract circuits. Connect load-sense line to circuit requiring pressure. An example is a wagon lift cylinder with load supported by mechanical stops in full down position. Load-sense signals pump when increased pressure is needed. Pressure remains low when not needed.

A-Return Line
B-Pressure Line
C-Load-Sense Line
D-Control Valve
E-Cylinder

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IMPORTANT: Circuit allows cylinder "leak-down" through load-sense line (C). If leakage is not acceptable for operation, use Example 3.

Example 3 -Control valve directs oil into extend or retract circuits, either requiring high pressure. Connect load-sense line to pressure line before control valve.

NOTE: System will maintain a maximum pressure of 20000 kPa (200 bar) (2900 psi) as long as power-beyond hoses are connected.

An example is a folding implement, where pressure is needed to extend or retract cylinders.

Example 4 -Pressure-compensated flow control valve is used to regulate hydraulic motor speed. Connect load-sense line to pressure line after control valve.

NOTE: Motor speed can fluctuate when other functions cause system pressure change. Minimize fluctuations by installing a pressure-compensated flow control valve.

NOTE: High flow scraper hydraulics not recommended for motor application.

A-Pressure Line
B-Return Line
C-Load-Sense Line
D-Control Valve
E-Cylinder
F-Pressure-Compensated Flow Valve
G-Hydraulic Motor

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