WOLFRAM SYSTEM MODELER

DCVM32

Mechanically actuated proportional valve with three ports and two states

Diagram

Wolfram Language

In[1]:=
SystemModel["Hydraulic.Valves.DirectionalControl.MechanicalActuation.DCVM32"]
Out[1]:=

Information

This is a model of a control valve with three ports and two states. The valve has a tank port t, a pressure port p, and a load port a. The insignal, u, to the spool is the force on the mechanical flange. The valve is controlled by a mechanical spool with dynamics; see SpoolM.


Control valve with three ports and two states


Valve at left position, u = 1; there is flow from a to t


Valve at right position, u = 0; there is flow from p to a

Implementation

This valve basically consists of orifices controlled by a spool.

Parameters (10)

medium

Value: Oil()

Type: Medium

Description: Medium in the component

V

Value: 0.0001

Type: Volume (m³)

Description: Volume of control valve

Gleak

Value: 1e-020

Type: PressureDependentLeakage (m³/(s⋅Pa))

Description: Leakage between orifices

overlap

Value: 0

Type: Length (m)

Description: Spool overlap, a number between -1 and 1; 0 if no overlap

AMax

Value: 0.001

Type: Area (m²)

Description: Maximum opening area

Cd

Value: 0.62

Type: Real

Description: Coefficient of discharge for the opening

L

Value: 1

Type: Length (m)

Description: Valve length

x0

Value: 0

Type: Position (m)

Description: Minimum valve position

f

Value: 80

Type: Frequency (Hz)

Description: Spool resonance frequency

d

Value: 0.9

Type: Damping (s⁻¹)

Description: Spool damping

Connectors (4)

port_a

Type: Port_b

Description: Port for hydraulic fluid (unfilled icon)

port_t

Type: Port_a

Description: Port for hydraulic fluid (filled icon)

port_p

Type: Port_a

Description: Port for hydraulic fluid (filled icon)

flange

Type: Flange_a

Description: One-dimensional translational flange (left, flange axis directed INTO cut plane)

Components (10)

medium

Type: Medium

Description: Medium in the component

flow_at

Type: ControlledOrifice

Description: Controlled restriction

flow_pa

Type: ControlledOrifice

Description: Controlled restriction

volume_t

Type: Volume

Description: Fixed volume with fluid storage

volume_p

Type: Volume

Description: Fixed volume with fluid storage

volume_a

Type: Volume

Description: Fixed volume with fluid storage

const

Type: Constant

Description: Generate constant signal of type Real

add1

Type: Add

Description: Output the sum of the two inputs

limiter1

Type: Limiter

Description: Limit the range of a signal

spoolWM

Type: SpoolM

Description: Model of a mechanic spool

Used in Examples (1)

SequenceCircuit1

Hydraulic.Examples.MultipleActuators

Example circuit with two cylinders working in a sequence