FourThreeWayProportionalValve-States

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FourThreeWayProportionalValve-States

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Iconic Diagrams\Hydraulics\Valves

Use

Domains: Continuous. Size: 1-D. Kind: Iconic Diagrams (Hydraulics).

Description

FourThreeWayProportionalValve-States

This model describes a 4/3-way proportional control valve with second order spool dynamics and lumped 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 FourThreeWayProportionalValve.htm.

 

The spool position is indicated by the input spoolpos:

sp = -1

Flow from p to b and a to t

-1 < sp < 0

Partial flow from p to b and a to t

 

sp = 0

No flow

0 < sp < 1

Partial flow from p to a and b to t

sp = 1

Flow from p to a and b to t

 

Implementation

The 4/3-way proportional control valve is implemented with various spool centre configurations. The configurations are shown in the picture below:

SpoolCenters

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.

Interface

Ports

Description

pp, pt, pa, pb

All terminals of the valve.

Causality

 

preferred effort out pp

preferred effort out pt

preferred effort out pa

preferred effort out pb

 

Inputs

 

spoolpos

value of the spool position

Parameters

 

FourThreeWayProportionalValve\rho

FourThreeWayProportionalValve\GLeak

FourThreeWayProportionalValve\Amax

FourThreeWayProportionalValve\Cd

FourThreeWayProportionalValve\overlap

FourThreeWayProportionalValve\f

FourThreeWayProportionalValve\d

Va\V

Va\B

Va\p_initial

Vb\V

Vb\B

Vb\p_initial

Mass density of the fluid [kg/m3].

Conductance of the laminar leakage flow [m3/s.Pa], GLeak >= 0.

Maximum spool valve area when the valve is open [m2], Amax > 0.

Discharge coefficient [], Cd > 0.

The valve overlap in closed position [], -1 < overlap < 1.

Bandwidth of the spool dynamics [Hz], f > 0.

Damping of the spool dynamics [], d > 0.

Volume of oil under pressure [m3]

Effective bulk modulus [Pa]

The starting pressure of the volume [Pa]

Volume of oil under pressure [m3]

Effective bulk modulus [Pa]

The starting pressure of the volume [Pa]