Load-Sense Hydraulic Connections - Examples

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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.

NOTE: Example 1 is the preferred practice.

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 load is supported by mechanical stops.

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 - Control Valve Directs Oil into Extend or Retract Circuits.

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Example 4 - Pressure Compensated Flow Control Valve.

A - Pressure Line

B - Return Line

C - Load-Sense Line

D - Control Valve

E - Cylinder

F - Pressure-Compensated Flow Valve

G - Hydraulic Motor

H - Motor Case Drain (Sump Line)

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.

IMPORTANT: System maintains 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: Pressure compenstated flow control valve regulates pump pressure to stabilize motor speed. Valve minimizes pump pressure fluctuations caused by activation of other hydraulic functions while motor is running. Connect load-sense line to pressure line after control valve.