2-Way Directional Control Valve - MapleSim Help

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2-Way Directional Control Valve

Valve that allows flow between four ports and two positions based on the flow path specified

 

Description

Variables

Connections

Parameters

Volumes

 

Description

A 2-way Directional Control Valve allows flow between four ports A, B, P, T with two positions to allow the flow through them. There are four orifices inter-connected to each other which opens up according to the input feed thereby allowing fluid to flow between the different port. A generic form allows the user to specify the custom scenario according to the need. Based on the orifice area, the pressure vs. flow rate relationship is calculated by the formulation used in the Orifice component.

The input s 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 Band parameter.

Same representation is followed for all types of Directional control components .

Component

Representation

Signal and flow path

DCV 42 PX

0

P -> A (open)

B-> T (open)

1

P -> B (open)

A -> T (open)

 

DCV 42 CP

 

0

All ports closed

1

P -> A (open)

B -> T (open)

 

DCV 42 G

Flow paths can be customized under the parameters

 

Variables

Name

Units

Description

Modelica ID

p__X

Pa

Pressure at port X, X∈{A, B, P,T}

pX

q__X

m3s

Flow rate into port X, X∈{A, B, P,T}

qX

Connections

Name

Description

Modelica ID

portA

Hydraulic port to path A

portA

portB

Hydraulic port path B

portB

portP

Hydraulic port for Pump

portP

portT

Hydraulic port for Tank

portT

s

Real input signal that sets valve position

s

Parameters

Name

Default

Units

Description

Modelica ID

A__max

0.001

m2

Maximum orifice opening area

Amax

A__min

1.0·1012

m2

Minimum orifice opening area (leakage)

Amin

C__d

0.7

Flow-discharge coefficient

Cd

ℜ__Cr

12

Reynolds number at critical flow

ReCr

Band

 

0.1

-

Transition length in normalized spool displacement

band

s__P−A  

[0,1]

-

Pump to path A (generic model)

sPA

s__P−B 

[1,0]

-

Pump to path B (generic model)

sPB

s__T−A

[1,0]

-

Tank to path A (generic model)

sTA

s__T−B

[0,1]

-

Tank to path B (generic model)

sTB

s__A−B

[0,0]

-

Path A to B (generic model)

sAB

s__P−T

[0,0]

-

Path pump to tank (generic model)

sPT

Volumes

Name

Default

Units

Description

Modelica ID

Use volume A

false

When true a hydraulic volume chamber is added to port A

useVolumeA

V__A

1·106

m3

Volume of chamber at port A

Va

Use volume B

false

When true a hydraulic volume chamber is added to port B

useVolumeB

V__B

1·106

m3

Volume of chamber at port B

Vb

Use volume P

false

When true a hydraulic volume chamber is added to port P

useVolumeP

V__P

1·106

m3

Volume of chamber at port P

Vp

Use volume T

false

When true a hydraulic volume chamber is added to port T

useVolumeT

V__T

1·106

m3

Volume of chamber at port T

Vt

For more information see Hydraulic Volume Equations

See Also

Hydraulic Valves

Orifice

Hydraulics Library