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Navigation: Library > Iconic Diagrams > Hydraulics > Valves > fourthreewaydirectionalvalve-states |
  
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Iconic Diagrams\Hydraulics\Valves
Domains: Continuous. Size: 1-D. Kind: Iconic Diagrams (Hydraulics).
This model describes a 4/3-way directional control valve with second order spool dynamics and parasitic volumes. The flow through the valves is described as laminar/turbulent flow through an orifice. A detailed description of the valve can be found in FourThreeWayDirectionalValve.htm.
The spool position is indicated by the input spoolpos:
sp = -1 |
Flow from p to b and a to t |
sp = 0 |
No flow |
sp = 1 |
Flow from p to a and b to t |
Values between -1 and 0 or between 0 and 1 are rounded to the nearest value.
The 4/3-way proportional control valve is implemented with various spool center configurations. The configurations are shown in the picture below:
When you drag and drop a model in the editor, you will be asked which implementation you want to choose. During modeling you can easily change the spool center configuration:
| 1. | Select the valve model. |
| 2. | Click the right mouse button to open the right mouse menu. |
| 3. | Click Edit Implementation and choose another implementation. |
Ports |
Description |
pp, pt, pa, pb |
All terminals of the valve. |
Causality |
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preferred effort out pp preferred effort out pt preferred effort out pa preferred effort out pb |
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Inputs |
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spoolpos |
position of the spool valve spoolpos < 0.5 => valve is closed spoolpos >= 0.5 => valve is open |
Parameters |
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FourThreeWayDirectionalValve\Q_nom
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Nominal flow at nominal pressure per edge, spool in the open position [m3/s], Q_nom > 0. |
FourThreeWayDirectionalValve\Q_nom_central |
Nominal flow at nominal pressure per edge with, spool in the closed position, Q_nom_central > 0. |
FourThreeWayDirectionalValve\Q_leak |
Leakage flow at nominal pressure per edge [m3/s], Q_leak > 0. Nominal pressure per edge [Pa], p_nom > 0. |
FourThreeWayDirectionalValve\overlap FourThreeWayDirectionalValve\f Va\V Va\p_initial Vb\V Vb\p_initial Vp\V Vp\p_initial Vt\V Vt\p_initial |
The valve overlap in closed position [], -1 < overlap < 1. Bandwidth of the spool dynamics [Hz], f > 0. Volume of oil under pressure [m3] (hidden)) The starting pressure of the volume [Pa] (hidden) Volume of oil under pressure [m3] (hidden) The starting pressure of the volume [Pa] (hidden) Volume of oil under pressure [m3] (hidden) The starting pressure of the volume [Pa] (hidden) Volume of oil under pressure [m3] (hidden) The starting pressure of the volume [Pa] (hidden) |