Check Valve II - MapleSim Help

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Check Valve II

Check valve with continuous variable

 

Description

Optional Volumes

Equations

Variables

Connections

Parameters

Description

The Check Valve II component allows fluid flow in one direction, from port A to port B.

This model uses a continuous-variable to model the change from open to closed. In the open-state the valve has a resistance given by Ropen. In the closed-state the valve has a conductance given by Gclose.

Optional Volumes

The boolean parameters Use volume A and Use volume B, when true, add optional volumes VA  and VB to ports A and B, respectively. See Port Volumes for details.

If two orfices or valves are connected, enabling a volume at the common port reduces the the stiffness of the system and improves the solvability.

Equations

closed&equals;s<0

p&equals;pApB&equals;{sGclosedclosedsotherwiseq&equals;qAqVA&equals;{sclosedsRopenotherwise

VfA&equals;{VA1&plus;pAEluseVolumeA0otherwiseVfB&equals;{VB1&plus;pBEluseVolumeB0otherwise

qVA&equals;{dVfAdtuseVolumeA0otherwiseqVB&equals;{dVfBdtuseVolumeB0otherwise

qA&plus;qBqVAqVB&equals;0

qsummary&equals;qflowScaleSummarydpsummary&equals;ppressScaleSummary

Variables

Name

Units

Description

Modelica ID

p

Pa

Pressure drop from A to B

p

q

m3s

Flow rate from port A to port B

q

qsummary

m3s

Internal flow sensor

q_summary

dpsummary

Pa

Internal pressure difference sensor

dp_summary

Vfx

m3

Effective volume at port x&comma;xA&comma;B

Vfx

qVx

m3s

Flow rate into effective volume at port x&comma;xA&comma;B

qVx

Connections

Name

Description

Modelica ID

portA

Upstream hydraulic port

portA

portB

Downstream hydraulic port

portB

Parameters

General Parameters

Name

Default

Units

Description

Modelica ID

Ropen

1·10−5

Pasm3

Open check valve resistance

Ropen

Gclosed

1·10−5

m3Pas

Closed check valve conductance

Gclosed

Start closed

true

 

True initializes valve to closed, false to open

Startclosed

Volume Parameters

Name

Default

Units

Description

Modelica ID

Use volume A

false

 

When true a hydraulic volume chamber is added to portA

useVolumeA

VA

1·10−6

m3

Volume of chamber A

Va

Use volume B

false

 

When true a hydraulic volume chamber is added to portB

useVolumeB

VB

1·10−6

m3

Volume of chamber B

Vb

For more information see Port Volumes.

See Also

Hydraulics Library

Valves