WOLFRAM SYSTEM MODELER

UnloadingReliefValveWithReversedPilot

Static unloading relief valve with pilot ratio applied to port_a

Diagram

Wolfram Language

In[1]:=
SystemModel["Hydraulic.Valves.FlowControl.Internal.UnloadingReliefValveWithReversedPilot"]
Out[1]:=

Information

This is a static model of an unloading relief valve with a pilot port.

Implementation

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

Limitations

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

Parameters (8)

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

Connectors (3)

port_b

Type: Port_b

port_a

Type: Port_a

port_pilot

Type: Port_a

Components (3)

medium

Type: Medium

Description: Medium in the component

flowAB

Type: ControlledOrifice

spool

Type: SpoolHPilotOperated

Used in Components (1)

BrakeValve

Hydraulic.Valves.FlowControl

Brake valve, allowing flow in one direction. The pilot port can be used to allow flow in the other direction.