WOLFRAM SYSTEM MODELER

AccumulatorChargingCircuit

Example circuit with an unloading relief valve and an accumulator

Diagram

Wolfram Language

In[1]:=
SystemModel["Hydraulic.Examples.Accumulators.AccumulatorChargingCircuit"]
Out[1]:=

Information

This example shows how an unloading relief valve can be used to limit maximum pressure and unload the pump when the desired accumulator pressure is reached.

Fig. 1 shows how the accumulator pressure builds up until a certain limit is reached. Fig. 2 shows how the mass flow rate through the relief valve increases when the pressure limit has been reached.

accumulatorChargingCircuitPlot1
Fig. 1 Accumulator pressure

accumulatorChargingCircuitPlot2
Fig. 2 Mass flow through the unloading relief valve

Reference

Industrial Hydraulics Manual, 5th ed., Maumee, OH: Eaton Hydraulics Training Services, 2008 p. 284.

Parameters (6)

medium

Value: Oil()

Type: Medium

Description: Medium in the component

pMin

Value: 30000000.0

Type: Pressure (Pa)

Description: Pressure when valve starts to open (unloadingReliefValve.pMin)

pMax

Value: 31000000.0

Type: Pressure (Pa)

Description: Pressure when valve is fully open (unloadingReliefValve.pMax)

w_fixed

Value: 157

Type: AngularVelocity (rad/s)

Description: Fixed speed (constantSpeed.w_fixed)

G

Value: 9.999999999999999e-12

Type: ConductanceOfLaminarResistance (m³/(s·Pa))

Description: Conductance of laminar resistance (fixedLaminarThrottle.G)

gamma

Value: 1.404

Type: Real

Description: Polytropic index of gas, default value 1.404 for nitrogen gas (accumulator.gamma)

Components (10)

medium

Type: Medium

Description: Medium in the component

accumulator

Type: GasChargedAccumulator

tank1

Type: Tank

tank2

Type: Tank

pump

Type: Pump

constantSpeed

Type: ConstantSpeed

checkValve

Type: CheckValve

unloadingReliefValve

Type: UnloadingReliefValve

tank3

Type: Tank

fixedLaminarThrottle

Type: FixedLaminarThrottle