Two Way Valve - MapleSim Help
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Two-Way Two-Position Valve

Two-position valve that controls flow between two ports

 

Description

Connections

Parameters

Description

The Two-Way Two-Position Valve component allows flow between ports A and P with two positions to control the flow.

The real input  controls the position of the value. An input of 0 corresponds to position 0, an input of 1 to position 1. Intermediates values produce an averaged position, with the transition length set by the  parameter.

The following figure shows how  and  effect the valve opening.

Formulation Approaches

One of two approaches can be selected for modeling the flow in the device. When the boolean parameter  is true, a constant coefficient of discharge () is used, otherwise a variable coefficient of discharge with maximum value () and a critical flow number () are used.

Connections

Name

Description

Modelica ID

Hydraulic port to path A

portA

Hydraulic port for pump

portP

Real input signal that controls valve position

s

Parameters

General

Name

Default

Units

Description

Modelica ID

Maximum orifice opening area

Amax

Minimum orifice opening area (leakage)

Amin

 

Transition length in normalized spool displacement

band

Orifice

Name

Default

Units

Description

Modelica ID

 

True (checked) means a constant coefficient of discharge is implemented, otherwise a variable  is used in flow calculations

UseConstantCd

 

Flow-discharge coefficient; used when  is true

Cd

 

Reynolds number at critical flow; used when  is true

ReCr

 

Maximum flow-discharge coefficient; used when  is false

Cd_max

 

Critical flow number; used when  is false

Crit_no

Optional Volumes

Name

Default

Units

Description

Modelica ID

 

True (checked) means a hydraulic volume chamber is added to portA

useVolumeA

Volume of chamber A

Va

 

True (checked) means a hydraulic volume chamber is added to portP

useVolumeP

Volume of chamber P

Vb

For more information see Port Volumes.

See Also

Hydraulics Library

Valves

 


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