Check Valve with Pressure-dependent Area - MapleSim Help

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Check Valve with Pressure-dependent Area

Check valve with opening area computed from table of area vs. pressure

 

Description

Pressure vs Area

Optional Volumes

Connections

Parameters

Description

The Check Valve Pressure-Dependent Area component allows fluid flow in one direction, from port A to port B.

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The valve orifice area is computed as a function of the pressure difference between port A and port B from a data table containing values of pressure difference vs the corresponding orifice area. Based on the orifice area, the pressure vs flow rate relationships are derived by the formulation used in the Orifice component.

Pressure vs Area

For this component, the orifice area must be specified as a function of the pressure difference in the form of a table. The following parameters allows users to specify the necessary data for this calculation.

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Data Source: This parameter allows users to specify the nature of the source file for the Pressure vs. Area table. The available options are file, attachment, and inline.

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file: Use this option to specify a source file (an Excel or a CSV file) located on the hard drive. Use the AdP parameter to browse to and/or select the data file. The data file will not be attached to the MapleSim model.

• 

attachment: Use this option to specify a data file (an Excel or a CSV file) that is attached to the MapleSim model. To be used as an attachment, data files must be attached to the MapleSim model and be categorized under Data Sets. The attached files in a MapleSim model can be viewed in the Attachments pane under the Data Sets section. For more information, see Attaching a File to a Model. If the required file is not already attached to the MapleSim model, use the AdP parameter to attach a new file.

Note:

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If the file option is used, subsequent changes to the source file will be incorporated into MapleSim simulations

– 

If the attachment option is used, subsequent changes to the source file will not affect the version attached to the MapleSim model. To ensure updates to the source files are incorporated in the simulation, the file must be reattached.

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The Data Generation App can be used to generate table data from mathematical functions using Maple code. For more information about MapleSim apps, see Opening MapleSim Apps and Templates.

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inline: Use this option to directly specify the pressure vs. area relationship in the form of a table. In the AdP parameter, enter an m×2  matrix. The first column must contain values of pressure difference and the second column must contain corresponding values of the area.

Note: To change the dimensions of table, right-click (Control-click for Mac®) the parameter field and select Edit Matrix Dimensions. In the Matrix Dimensions dialog, enter values for the number or rows and columns and then click OK.

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Skip rows: This option allows users to specify the number of top rows to be ignored during the calculations. This option can be useful when the Excel file contains header information.

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Smooth: The smooth option specifies how the data table is interpolated.

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Pressure difference unit: This option specifies the unit of pressure used in the supplied data.

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Area unit: This option specifies the unit of area used in the supplied data.

Optional Volumes

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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.

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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.

Connections

Name

Description

Modelica ID

portA

Upstream hydraulic port

portA

portB

Downstream hydraulic port

portB

Parameters

General Parameters

Name

Default

Units

Description

Modelica ID

Cd

710

 

Flow-discharge coefficient

Cd

Cr

12

 

Reynolds number at critical flow

ReCr

Area vs. Pressure Parameters

Name

Default

Units

Description

Modelica ID

Data source

inline

 

data source

datasourcemode

AdP

100.,0.001

 

data set

table

Skip rows

0

 

Number of rows to skip

skipRows

Smooth

linear

 

smoothness of table interpolation

smoothness

Pressure difference unit

kPa

 

Unit of pressure used in the data

pressUnit

Area unit

cm2

 

Unit of area used in the data

areaUnit

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

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For more information see Port Volumes.

See Also

Hydraulics Library

Valves