WOLFRAM SYSTEM MODELER
PressureReliefValvePressure valve, controlled by the pressure difference between the ports |
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Diagram
Wolfram Language
In[1]:=
SystemModel["Hydraulic.Valves.PressureControl.PressureReliefValve"]
Out[1]:=
Information
This is a model of a pressure relief valve with lumped volumes. If the pressure difference between the upstream and downstream port is higher than pMin, the valve starts to open. When the pressure difference reaches pMax, the valve is fully open. The spool model has first-order dynamics with time constant t1. This valve could be used for controlling the upstream pressure in a system (the part connected to port a).
A spool type pressure relief valve
A spool type pressure relief valve
Implementation
This valve basically consists of an orifice controlled by a spool.Reference
Industrial Hydraulics Manual, 5th ed., Maumee, OH: Eaton Hydraulics Training Services, 2008 p. 277.Parameters (8)
| medium |
Value: Oil() Type: Medium Description: Medium in the component |
|---|---|
| V |
Value: 0.0001 Type: Volume (m³) Description: Volume of control valve |
| Gleak |
Value: 9.999999999999999e-21 Type: PressureDependentLeakage (m³/(s⋅Pa)) Description: Leakage between ports |
| pMax |
Value: 21000000.0 Type: Pressure (Pa) Description: Pressure when valve is fully open |
| pMin |
Value: 20000000.0 Type: Pressure (Pa) Description: Pressure when valve starts to open |
| t1 |
Value: 0.01 Type: Time (s) Description: Time constant for first-order system |
| AMax |
Value: 0.001 Type: Area (m²) Description: Maximum opening area |
| Cd |
Value: 0.62 Type: Real Description: Coefficient of discharge for the opening |
Connectors (2)
Components (4)
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medium |
Type: Medium Description: Medium in the component |
|---|---|---|
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pressureReliefValve |
Type: PressureReliefValve Description: Static pressure relief valve |
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volume_a |
Type: Volume Description: Fixed volume with fluid storage |
|
volume_b |
Type: Volume Description: Fixed volume with fluid storage |
Used in Examples (14)
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Hydraulic.Examples.FlowControl Example circuit with meter-in flow control |
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Hydraulic.Examples.FlowControl Example circuit with meter-out flow control |
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Hydraulic.Examples.FlowControl Example circuit with bleed-off flow control |
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Hydraulic.Examples.MultipleActuators Example circuit with a sub-circuit operating at a reduced pressure |
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Hydraulic.Examples.MultipleActuators Example circuit with two cylinders working in a sequence |
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Hydraulic.Examples.MultipleActuators Example circuit with two cylinders working in a sequence |
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Hydraulic.Examples.Rotation Example circuit of a pump driving a motor |
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Hydraulic.Examples.Rotation Example circuit with a pump that unloads to a reservoir when inactive |
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Hydraulic.Examples.Rotation Example circuit with a brake valve |
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Hydraulic.Examples.Translation Example circuit of a cylinder moving a load |
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Hydraulic.Examples.Translation Example circuit of a cylinder moving a load with the help of a simple controller |
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Hydraulic.Examples.Translation Example circuit of a cylinder moving a load |
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Hydraulic.Examples.Translation Example circuit of a cylinder lifting and holding a mass |
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Hydraulic.Examples.Filter Example of a hydraulic system using filters |