WOLFRAM SYSTEM MODELER
DCVH43OpenCenterHydraulically actuated proportional control valve with four ports and three states |
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Diagram
Wolfram Language
In[1]:=
SystemModel["Hydraulic.Valves.DirectionalControl.HydraulicActuation.DCVH43OpenCenter"]
Out[1]:=
Information
This is a model of a control valve with six ports and three states. The valve has a tank port t, a pressure port p, two load ports a and b, and two pilot ports p1 and p2. The insignal, u, to the spool is the pressure difference between ports p1 and p2. The valve is controlled by a hydraulic spool with first-order dynamics; see SpoolH.
This valve is similar to DCVH43ClosedCenter; the only difference is the middle state. In this model, all ports are connected in the middle state. In the figure below, u is the pressure difference between ports p1 and p2.
Control valve with four ports and three states
This valve is similar to DCVH43ClosedCenter; the only difference is the middle state. In this model, all ports are connected in the middle state. In the figure below, u is the pressure difference between ports p1 and p2.
Control valve with four ports and three states
Implementation
This valve basically consists of orifices controlled by a spool.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: 1e-020 Type: PressureDependentLeakage (m³/(s⋅Pa)) Description: Leakage between orifices |
| overlap |
Value: 0 Type: Length (m) Description: Spool overlap, a number between -1 and 1; 0 if no overlap |
| AMax |
Value: 0.001 Type: Area (m²) Description: Maximum opening area |
| Cd |
Value: 0.62 Type: Real Description: Coefficient of discharge for the opening |
| pMin |
Value: 10000.0 Type: Pressure (Pa) Description: Pressure difference when the valve starts to move |
| pMax |
Value: 500000.0 Type: Pressure (Pa) Description: Pressure difference when the valve has reached its maximum position |
| t1 |
Value: 0.01 Type: Time (s) Description: Time constant for first-order system |
Connectors (6)
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port_p |
Type: Port_a Description: Port for hydraulic fluid (filled icon) |
|---|---|---|
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port_t |
Type: Port_a Description: Port for hydraulic fluid (filled icon) |
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port_b |
Type: Port_b Description: Port for hydraulic fluid (unfilled icon) |
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port_a |
Type: Port_b Description: Port for hydraulic fluid (unfilled icon) |
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port_p1 |
Type: Port_a Description: Port for hydraulic fluid (filled icon) |
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port_p2 |
Type: Port_b Description: Port for hydraulic fluid (unfilled icon) |
Components (12)
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medium |
Type: Medium Description: Medium in the component |
|---|---|---|
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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 |
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volume_t |
Type: Volume Description: Fixed volume with fluid storage |
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volume_p |
Type: Volume Description: Fixed volume with fluid storage |
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rightState |
Type: CrossOver4Port Description: Basic building block for directional control valves |
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leftState |
Type: Straight4Port Description: Basic building block for directional control valves |
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middleState |
Type: Open4Port Description: Basic building block for directional control valves |
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abs1 |
Type: Abs Description: Output the absolute value of the input |
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add1 |
Type: Add Description: Output the sum of the two inputs |
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const |
Type: Constant Description: Generate constant signal of type Real |
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spoolH1 |
Type: SpoolH Description: Model of a hydraulic spool |