fourthreewaydirectionalvalve-states

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fourthreewaydirectionalvalve-states

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Iconic Diagrams\Hydraulics\Valves

Use

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

Description

FourThreeWayDirectionalValve-States

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.

Implementation

The 4/3-way proportional control valve is implemented with various spool center 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

position of the spool valve

spoolpos < 0.5 => valve is closed

spoolpos >= 0.5 => valve is open

Parameters

 

FourThreeWayDirectionalValve\Q_nom

 

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

FourThreeWayDirectionalValve\p_nom

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)