WOLFRAM SYSTEM MODELER

SequenceValve

Pressure valve, controlled by the pressure at port_a

Diagram

Wolfram Language

In[1]:=
SystemModel["Hydraulic.Valves.PressureControl.SequenceValve"]
Out[1]:=

Information

This is a model of a pressure compensating valve with lumped volumes. If the pressure at port a is higher than pMin, the valve starts to open. When the pressure reaches pMax, the valve is fully open. The spool model has first-order dynamics with time constant t1.

Implementation

This valve basically consists of an orifice controlled by a spool.

Reference

Industrial Hydraulics Manual, 5th ed., Maumee, OH: Eaton Hydraulics Training Services, 2008 p. 291.

Parameters (8)

medium

Value: Oil()

Type: Medium

Description: Medium in the component

V

Value: 0.0001

Type: Volume (m³)

Description: Volume of control valve

Gleak

Value: 9.999999999999999e-21

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

Description: Leakage between ports

pMax

Value: 21000000.0

Type: Pressure (Pa)

Description: Pressure when valve is fully opened

pMin

Value: 20000000.0

Type: Pressure (Pa)

Description: Pressure when valve starts to open

t1

Value: 0.01

Type: Time (s)

Description: Time constant for first-order system

AMax

Value: 0.001

Type: Area (m²)

Description: Maximum opening area

Cd

Value: 0.62

Type: Real

Description: Coefficient of discharge for the opening

Connectors (2)

port_b

Type: Port_b

Description: Port for hydraulic fluid (unfilled icon)

port_a

Type: Port_a

Description: Port for hydraulic fluid (filled icon)

Components (5)

medium

Type: Medium

Description: Medium in the component

pressureCompensatingValve

Type: PressureCompensatingValveNormallyClosed

Description: Static pressure compensating valve

volume_a

Type: Volume

Description: Fixed volume with fluid storage

volume_b

Type: Volume

Description: Fixed volume with fluid storage

tank1

Type: Tank

Description: Simple tank with constant pressure

Used in Examples (1)

SequenceCircuit2

Hydraulic.Examples.MultipleActuators

Example circuit with two cylinders working in a sequence