Examples Using Load-Sensing Hydraulic System—Power-Beyond

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Example 1

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Example 2

A - Return Line

B - Pressure Line

C - Load-Sense Line

D - Control Valve

E - Cylinder

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.

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

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Example 3

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Example 4

A - Pressure Line

B - Return Line

C - Load-Sense Line

D - Control Valve

E - Cylinder

F - Pressure-Compensated Flow Valve

G - Hydraulic Motor

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: For Ag high flow, it is recommended that the hydraulic motor be connected to the top SCV’s (45cc high flow pump).

High flow scraper hydraulics is not recommended for motor application.