WOLFRAM SYSTEM MODELER
CounterBalanceValveCounterbalance valve, allowing flow in one direction. The pilot port can be used to allow flow in the other direction. |
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Diagram
Wolfram Language
In[1]:=
SystemModel["Hydraulic.Valves.FlowControl.CounterBalanceValve"]
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Information
This is a model of a counterbalance valve with lumped volumes. It will allow free flow in one direction and only allow flow in the other direction if the pressure is high enough or if there is high pressure on the pilot port.
Implementation
The model is an assembly consisting of an unloading relief valve and a check valve. The check valve allows flow in one direction. The relief valve will open and allow flow in the other direction if the pressure difference is high enough. The pilot port can be used to open the relief valve.Reference
Industrial Hydraulics Manual, 5th ed., Maumee, OH: Eaton Hydraulics Training Services, 2008 p. 293.Parameters (14)
| medium |
Value: Oil() Type: Medium Description: Medium in the component |
|---|---|
| V |
Value: 0.0001 Type: Volume (m³) Description: Volume of assembly |
| Gleak |
Value: 1e-020 Type: PressureDependentLeakage (m³/(s⋅Pa)) Description: Leakage between ports |
| ACheckValve |
Value: 0.001 Type: Area (m²) Description: Opening area of check valve when opened |
| CdCheckValve |
Value: 0.62 Type: Real Description: Coefficient of discharge for the opening of check valve |
| pMaxCheckValve |
Value: 100000.0 Type: Pressure (Pa) Description: Pressure when check valve is fully open |
| pMinCheckValve |
Value: 100 Type: Pressure (Pa) Description: Pressure when check valve starts to open |
| t1CheckValve |
Value: 0.001 Type: Time (s) Description: Time constant for first-order system of the check valve |
| pMaxReliefValve |
Value: 21000000.0 Type: Pressure (Pa) Description: Pressure when relief valve is fully open |
| pMinReliefValve |
Value: 20000000.0 Type: Pressure (Pa) Description: Pressure when relief valve starts to open |
| t1ReliefValve |
Value: 0.01 Type: Time (s) Description: Time constant for first-order system of relief valve |
| AReliefValve |
Value: 0.001 Type: Area (m²) Description: Maximum opening area of relief valve |
| CdReliefValve |
Value: 0.62 Type: Real Description: Coefficient of discharge for the opening of relief valve |
| kpReliefValve |
Value: 1 Type: Real Description: Pilot ratio of relief valve; a positive value helps port_a |
Connectors (3)
Components (3)
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medium |
Type: Medium Description: Medium in the component |
|---|---|---|
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unloadingReliefValve |
Type: UnloadingReliefValve Description: Unloading relief valve, controlled by the pressure difference between the ports |
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checkValve |
Type: CheckValve Description: Check valve with lumped volumes |
Used in Examples (1)
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Hydraulic.Examples.Translation Example circuit of a cylinder lifting and holding a mass |