WOLFRAM SYSTEM MODELER
PressureReducingValvePressure valve, controlled by the pressure difference between the ports |
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Diagram
Wolfram Language
In[1]:=
SystemModel["Hydraulic.Valves.PressureControl.PressureReducingValve"]
Out[1]:=
Information
This is a model of a pressure reducing valve with lumped volumes. If the downstream pressure is higher than pMin, the valve starts to close. When the pressure reaches pMax, the valve is fully closed. The spool model has first-order dynamics with time constant t1. This valve could be used to control the downstream pressure in a system (the part connected to port b).
A spool type pressure reducing valve
A spool type pressure reducing 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. 286.Parameters (9)
| 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 |
| Gbleed |
Value: 1e-10 Type: ConductanceOfLaminarResistance (m³/(s⋅Pa)) Description: Conductance of oil bleed passage |
| pMax |
Value: 21000000.0 Type: Pressure (Pa) Description: Pressure when valve is fully opened |
| 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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pressureReducingValve |
Type: PressureReducingValve Description: Static pressure reducing valve |
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volume_a |
Type: Volume Description: Fixed volume with fluid storage |
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volume_b |
Type: Volume Description: Fixed volume with fluid storage |
Used in Examples (2)
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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 |