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MapleSim Hydraulics Library from Modelon

Shuttle Valve  Shuttle valve with internal resistance and volumes at the ports

The Shuttle Valve component describes a shuttle valve. The flow to port T depends on the pressures at ports A and B:

pA  pB

qA from A to T like an orifice (parameters: d, k1, k2) qB from B to T = 0 leakage from A to B (laminar resistance, parameter Gleak)

pA  pB

qB from B to T like an orifice (parameters: d, k1, k2) qA from A to T = 0 leakage from B to A (laminar resistance, parameter Gleak)

pA  pB

Characteristic curve of a valve with underlap; that is, for pA=pB there is flow from A to T and from B to T. The flow area is 25% of the maximum area. This transition is needed to avoid problems with the integration routine.

See Shuttle Valve No States for more information. The mass and flow forces are not included. Use the modifier(s)

VolumeA(port_A(p(start=1e5,fixed=true)))

and/or

VolumeB(port_A(p(start=1e5,fixed=true)))

and/or

VolumeT(port_A(p(start=1e5,fixed=true)))

to set the initial condition(s) for the pressure of the lumped volume(s) Pa.

Related Components

Name

Description

Shuttle Valve No States

Shuttle valve with internal resistance

 

Variables

Connections

Parameters

Variables

Name

Value

Units

Description

Modelica ID

VA

 

 

 

VolumeA

VB

 

 

 

VolumeB

VT

 

 

 

VolumeT

pAsummary

pA

Pa

Pressure at port A

summary_pA

pBsummary

pB

Pa

Pressure at port P

summary_pB

pTsummary

pT

Pa

Pressure at port T

summary_pT

ΔpATsummary

pApT

Pa

Pressure drop

summary_dp_AT

ΔpBTsummary

pBpT

Pa

Pressure drop

summary_dp_BT

shuttleValveNoStates

 

 

 

shuttleValveNoStates

qATsummary

[1]

m3s

Flow rate flowing port_P to port_A

summary_qAT

qBTsummary

[2]

m3s

Flow rate flowing port_P to port_B

summary_qBT

[1] shuttleValveNoStates.MOAT.q

[2] shuttleValveNoStates.MOBT.q

Connections

Name

Description

Modelica ID

portA

port_A: oil mostly enters the element

port_A

portB

Hydraulic port where oil enters or leaves the element

port_B

portT

Hydraulic port where oil mostly leaves the element

port_T

oil

 

oil

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 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

VT

10-6

m3

Geometric volume at port T

volumeT

ΔTsystem

0

K

Temperature offset from system temperature

dT_system

d

0.005

m

Diameter of equivalent orifice

diameter

popen

104

Pa

Pressure differential to close one path completely

popen

k1

10

 

Laminar part of orifice model

k1

k2

2

 

Turbulent part of orifice model, k2=1Cd2

k2

Gleak

10-16

m3sPa

Conductance of leakage from A to B

Gleak

See Also

Shuttle Valve No States

Valves

MapleSim Hydraulics Library from Modelon Overview

 


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