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WOLFRAM SYSTEM MODELER

PressureReducingValve

Pressure valve, controlled by the pressure difference between the ports

Diagram

Wolfram Language

In[1]:=

SystemModel["Hydraulic.Valves.PressureControl.PressureReducingValve"]

Out[1]:=

Information

This is a model of a pressure reducing valve with lumped volumes. If the downstream pressure is higher than pMin, the valve starts to close. When the pressure reaches pMax, the valve is fully closed. The spool model has first-order dynamics with time constant t1. This valve could be used to control the downstream pressure in a system (the part connected to port b).

A spool type pressure reducing valve

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. 286.

Parameters (9)

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
Gbleed	Value: 1e-10 Type: ConductanceOfLaminarResistance (m³/(s⋅Pa)) Description: Conductance of oil bleed passage
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)

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 (4)

	medium	Type: Medium Description: Medium in the component
	pressureReducingValve	Type: PressureReducingValve Description: Static pressure reducing valve
	volume_a	Type: Volume Description: Fixed volume with fluid storage
	volume_b	Type: Volume Description: Fixed volume with fluid storage

Used in Examples (2)

SubCircuitWithReducedPressure

Hydraulic.Examples.MultipleActuators

Example circuit with a sub-circuit operating at a reduced pressure

SequenceCircuit2

Hydraulic.Examples.MultipleActuators

Example circuit with two cylinders working in a sequence