DCV 42 PX - MapleSim Help
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DCV 42 PX

4-way 2-position parallel-cross directional control valve

 

Description

Connections

Parameters

Description

The DCV 42 PX component is a 4-way 2-position valve. The area between pairs of ports varies as a function of the spool input signal, , and the parameters , , and . The following table gives the areas for two values of the spool input.

Spool Input

P-A

P-B

A-T

B-T

0

1

Transitions are centered at the midpoint, with the width given by the  parameter, as shown in the following diagram.

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.

Optional Volumes

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

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

Connections

Name

Description

Modelica ID

Hydraulic port A

portA

Hydraulic port B

portB

Hydraulic port P (pump)

portP

Hydraulic port T (tank)

portT

Spool input signal

s

Parameters

General

Name

Default

Units

Description

Modelica ID

Maximum orifice opening area; available when Use scales is true

Amax

Minimum orifice opening area (leakage)

Amin

 

Transition length in normalized spool displacement units

band

 

True (checked) flips the order of the valve configuration

Switch

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

Coeff

 

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 portX

useVolumeX

Volume of chamber attached to portX

Vx

For more information see Port Volumes.

See Also

Directional Control Valves

Hydraulics Library

 


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