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WOLFRAM SYSTEM MODELER

UnloadingReliefValve

Static unloading relief valve

Diagram

In[1]:=

SystemModel["Hydraulic.Valves.PressureControl.Internal.UnloadingReliefValve"]

Out[1]:=

This is a static model of an unloading relief valve.

This model does not contain lumped volumes, so it does not integrate the flow and compute the pressure at the ports.

medium	Value: Oil() Type: Medium Description: Medium in the component
Gleak	Value: 1e-020 Type: PressureDependentLeakage (m³/(s⋅Pa)) Description: Leakage between orifices
pMax	Value: 21000000.0 Type: Pressure (Pa) Description: Pressure when valve is fully open
pMin	Value: 20000000.0 Type: Pressure (Pa) Description: Pressure when valve starts to open
t1	Value: 0.1 Type: Time (s) Description: Time constant for first-order system
AMax	Value: 0.01 Type: Area (m²) Description: Maximum opening area
Cd	Value: 0.62 Type: Real Description: Coefficient of discharge for the opening
kp	Value: 0.85 Type: Real Description: Pilot ratio; a positive value helps port_a

	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_pilot	Type: Port_a Description: Port for hydraulic fluid (filled icon)

port_b

Description: Port for hydraulic fluid (unfilled icon)

port_a

Description: Port for hydraulic fluid (filled icon)

port_pilot

Description: Port for hydraulic fluid (filled icon)

	medium	Type: Medium Description: Medium in the component
	flowAB	Type: ControlledOrifice Description: Controlled restriction
	spool	Type: SpoolHPilotOperated Description: Model of a hydraulic spool

medium

Description: Medium in the component

flowAB

Description: Controlled restriction

spool

Description: Model of a hydraulic spool

Hydraulic.Valves.PressureControl

Unloading relief valve, controlled by the pressure difference between the ports