WOLFRAM SYSTEM MODELER

PressureCompensatingValveNormallyOpen

Pressure valve, controlled by the pressure difference between the ports

Diagram

Wolfram Language

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

Information

This is a model of a pressure compensating valve with lumped volumes. If the pressure difference between the closing and opening pilot ports is higher than pMin, the valve starts to close. When the pressure difference reaches pMax, the valve is fully closed. The spool model has first-order dynamics with time constant t1.

Implementation

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

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 (4)

port_b

Type: Port_b

Description: Port for hydraulic fluid (unfilled icon)

port_a

Type: Port_a

Description: Port for hydraulic fluid (filled icon)

port_open

Type: Port_b

Description: Port for hydraulic fluid (unfilled icon)

port_close

Type: Port_a

Description: Port for hydraulic fluid (filled icon)

Components (4)

medium

Type: Medium

Description: Medium in the component

pressureCompensatingValve

Type: PressureCompensatingValveNormallyOpen

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

Used in Components (1)

TwoWayFlowControlValve

Hydraulic.Valves.FlowControl

Assembly with a restriction and a pressure compensating valve