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MapleSim Hydraulics Library from Modelon

DCV_4_2_X  Template for a directional control valve with 2 positions and four ports to be configured by the user

Use the DCV_4_2_X component to build your own model of a directional control valve with two positions (that is, two stable states) and four ports.

Enter the valve behavior in the Parameters  Spool Geometry section (found under the Inspector tab) by populating the six connection vectors (open_P_A, open_P_B, open_A_T, open_B_T, open_P_T, and open_A_B). Each vector has five entries corresponding to the five normalized spool positions [ 0 0.25 0.5 0.75 1 ]. Enter a 1 for the spool position if the connection is open at that spool position; enter a 0 for the spool position if the connection is closed at that spool position.

The Example section on this page provides more detail on how to configure a custom spool, including information on setting the parameters for leakage and nominal flow rates between ports.

Connections

Name

Description

Modelica ID

portA

Port A, one of valve connections to actuator or motor

port_A

portB

Port B, one of valve connections to actuator or motor

port_B

portP

Port P, where oil enters the component from the pump

port_P

portT

Port T, where oil flows to the tank

port_T

commandB

Command signal for valve

commandB

oil

 

oil

Parameters

General Parameters

Name

Default

Units

Description

Modelica ID

use volume A

true

 

If true, a volume is present at port_A

useVolumeA

use volume B

true

 

If true, a volume is present at port_B

useVolumeB

use volume P

true

 

If true, a volume is present at port_P

useVolumeP

use volume T

true

 

If true, a volume is present at port_T

useVolumeT

VA

10-6

m3

Geometric volume at port A

volumeA

VB

10-6

m3

Geometric volume at port B

volumeB

VP

10-6

m3

Geometric volume at port P

volumeP

VT

10-6

m3

Geometric volume at port T

volumeT

ΔTsystem

0

K

Temperature offset from system temperature

dT_system

Dynamic Parameters

Name

Default

Units

Description

Modelica ID

τopening

0.03

s

Switching time to open valve 95%

tau_opening

τclosing

0.02

s

Switching time to close valve 95%

tau_closing

Flow Parameters

Name

Default

Units

Description

Modelica ID

Δpnom

7.·105

Pa

Pressure drop at nominal flow rate qnom

dpnom

qnomPA

0.00158

m3s

Nominal flow rate from P -> A

qnom_P_A

qnomPB

qnomPA

m3s

Nominal flow rate from P -> B

qnom_P_B

qnomAT

qnomPA

m3s

Nominal flow rate from A -> T

qnom_A_T

qnomBT

qnomPA

m3s

Nominal flow rate from B -> T

qnom_B_T

qnomPT

0

m3s

Nominal flow rate from P -> T

qnom_P_T

qnomAB

0

m3s

Nominal flow rate from A -> B

qnom_A_B

Pmax

1.26·105

W

Max. hydraulic power

P_max

coeffP

10

 

Influence of hydraulic power on flow rate

coeff_P

k1

10

 

Laminar part of orifice model

k1

k2

2

 

Turbulent part of orifice model, k2=1Cd2

k2

Spool Geometry Parameters

Name

Default

Units

Description

Modelica ID

spoolxaxis

0.,0.250,0.500,0.750,1.

 

Normalized spool position

spool_x_axis

openPA

0.,0.,0.,0.,0.

 

Open (1) and closed (0) path P -> A as function of normalized spool position

open_P_A

openPB

0.,0.,0.,0.,0.

 

Open (1) and closed (0) path P -> B as function of normalized spool position

open_P_B

openAT

0.,0.,0.,0.,0.

 

Open (1) and closed (0) path A -> T as function of normalized spool position

open_A_T

openBT

0.,0.,0.,0.,0.

 

Open (1) and closed (0) path B -> T as function of normalized spool position

open_B_T

openPT

0.,0.,0.,0.,0.

 

Open (1) and closed (0) path P -> T as function of normalized spool position

open_P_T

openAB

0.,0.,0.,0.,0.

 

Open (1) and closed (0) path A -> B as function of normalized spool position

open_A_B

dleak

1.67·10-5

m

Diameter of equivalent orifice to model leakage of closed valve; P -> A, P -> B,A -> T, B -> T

dleak

See Also

Adding Text and Illustrations to a Subsystem or Custom Component, DirectionalControl, Grouping Modeling Components into Subsystems, MapleSim Hydraulics Library from Modelon Overview


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