WOLFRAM SYSTEM MODELER
DCVH43ClosedCenterHydraulically actuated proportional control valve with four ports and three states |
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Diagram
Wolfram Language
In[1]:=
SystemModel["Hydraulic.Valves.DirectionalControl.HydraulicActuation.DCVH43ClosedCenter"]
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.
Control valve with four ports and three states
Valve with no overlap at center position. At the center position the valve is closed, and there is only leakage flow between the ports if there is no overlap.
Valve at left position, u = 1; there is flow from p to a and from b to t
Valve at right position, u = -1; there is flow from a to t and from p to b
Control valve with four ports and three states
Valve with no overlap at center position. At the center position the valve is closed, and there is only leakage flow between the ports if there is no overlap.
Valve at left position, u = 1; there is flow from p to a and from b to t
Valve at right position, u = -1; there is flow from a to t and from p to b
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 (8)
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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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spoolH1 |
Type: SpoolH Description: Model of a hydraulic spool |