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MapleSim Hydraulics Library from Modelon

Reducing Valve  Pressure reducing valve

The Reducing Valve component describes a pressure reducing valve. The flow at port A depends on the pressure at port A (portA.p). The commanded pressure is given by parameter pnominal. If the pressure is very low the valve is completely open from P to A; if it is much higher than the commanded value the valve is completely open from A to T. Between (pnominalpwork) and (pnominal+pwork) the valve is in the working range.

pA is lower than pnominalpwork

Passage P  A wide open. Flow rate from P  A: q=pPpAGPA.

pA is between pnominalpwork and pnominal

Working range. Flow from P  A.

pA is between pnominal and pnominal+pwork

Working range. Flow from A  T.

pA is higher than pnominal+pwork

Passage A  T wide open. Flow rate from A  T: q=pApTGAT.

 

The mass and flow forces are not included.

Use the modifier(s)

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

and/or

VolumeP(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.

Events

There is a new boolean reduceEvents (selected by default) in the Advanced section under the Properties tab ( ). Selecting reduceEvents lets the model use noEvents(expr) to generate fewer events for boolean expressions that should not generate events. In some cases the solver might reduce the stepsize too much and generate a lot of steps. If this happens, try clearing reduceEvents.

 

Variables

Connections

Parameters

Variables

Name

Value

Units

Description

Modelica ID

VT

 

 

 

VolumeT

VP

 

 

 

VolumeP

VA

 

 

 

VolumeA

pAsummary

pA

Pa

Pressure at port A

summary_pA

pPsummary

pP

Pa

Pressure at port P

summary_pP

pTsummary

pT

Pa

Pressure at port T

summary_pT

ΔpPAsummary

pPpA

Pa

Pressure drop

summary_dp_PA

ΔpATsummary

pApT

Pa

Pressure drop

summary_dp_AT

reducingValve

 

 

 

reducingValve

qPAsummary

reducingValve.qPA

m3s

Flow rate flowing port_P to port_A

summary_qPA

qATsummary

reducingValve.qAT

m3s

Flow rate flowing port_A to port_T

summary_qAT

Connections

Name

Description

Modelica ID

portP

Hydraulic port where oil enters the component

port_P

portT

Hydraulic port where oil enters the component

port_T

portA

Hydraulic port where oil leaves the component

port_A

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 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

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

pnominal

107

Pa

Nominal pressure

pnominal

pwork

5.·105

Pa

Working range

pwork

GPA

1.6·10-9

m3sPa

Conductance of wide open valve from P  A

GPA

GAT

1.6·10-9

m3sPa

Conductance of wide open valve from A  T

GAT

Advanced Parameters

Name

Default

Units

Description

Modelica ID

reduce events

true

 

If true, generate less events

reduceEvents

See Also

Valves

MapleSim Hydraulics Library from Modelon Overview

 


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