WOLFRAM SYSTEM MODELER
LoadHoldingCircuitExample circuit of a cylinder lifting and holding a mass |
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Diagram
Wolfram Language
In[1]:=
SystemModel["Hydraulic.Examples.Translation.LoadHoldingCircuit"]
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Information
This example model shows how to move and hold a load with a cylinder and a counter-balance valve. During lifting, the check valve component of the counter-balance valve allows flow. During lowering, high pressure on the pilot port opens the relief valve component of the counter-balance valve. When the load is not lowered or lifted, the check valve prevents the flow.
Fig. 1 shows how the cylinder is lifted and Fig. 2 shows how the check valve allows flow during the lifting.
Fig. 1 Load position
Fig. 2 Flow through the check valve
Fig. 1 shows how the cylinder is lifted and Fig. 2 shows how the check valve allows flow during the lifting.
Fig. 1 Load position
Fig. 2 Flow through the check valve
Reference
Industrial Hydraulics Manual, 5th ed., Maumee, OH: Eaton Hydraulics Training Services, 2008 p. 294.Parameters (1)
| medium |
Value: Oil() Type: Medium Description: Medium in the component |
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Components (17)
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medium |
Type: Medium Description: Medium in the component |
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tank1 |
Type: Tank Description: Simple tank with constant pressure |
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tank2 |
Type: Tank Description: Simple tank with constant pressure |
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pump |
Type: Pump Description: Model of a pump with fixed displacement and volumes |
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tank3 |
Type: Tank Description: Simple tank with constant pressure |
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mass |
Type: Mass Description: Sliding mass with inertia |
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positionSensor |
Type: PositionSensor Description: Ideal sensor to measure the absolute position |
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cylinderDouble |
Type: CylinderDouble Description: Double cylinder model |
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const |
Type: Constant Description: Generate constant signal of type Real |
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constantSpeed |
Type: ConstantSpeed Description: Constant speed, not dependent on torque |
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pressureReliefValve |
Type: PressureReliefValve Description: Pressure valve, controlled by the pressure difference between the ports |
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min1 |
Type: Min Description: Pass through the smallest signal |
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stopStep |
Type: Step Description: Generate step signal of type Real |
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startStep |
Type: Step Description: Generate step signal of type Real |
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controlValve |
Type: PCVE43TandemCenter Description: Electrically actuated proportional control valve with four ports and three states |
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gravitationalForce |
Type: ConstantForce Description: Constant force, not dependent on speed |
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counterBalanceValve |
Type: CounterBalanceValve Description: Counterbalance valve, allowing flow in one direction. The pilot port can be used to allow flow in the other direction. |