WOLFRAM SYSTEM MODELER

LoadHoldingCircuit

Example circuit of a cylinder lifting and holding a mass

Diagram

Wolfram Language

In[1]:=
SystemModel["Hydraulic.Examples.Translation.LoadHoldingCircuit"]
Out[1]:=

Information

This example model shows how to move and hold a load with a cylinder and a counter-balance valve. During lifting, the check valve component of the counter-balance valve allows flow. During lowering, high pressure on the pilot port opens the relief valve component of the counter-balance valve. When the load is not lowered or lifted, the check valve prevents the flow.

Fig. 1 shows how the cylinder is lifted and Fig. 2 shows how the check valve allows flow during the lifting.

loadHoldingCircuitPlot1
Fig. 1 Load position

loadHoldingCircuitPlot2
Fig. 2 Flow through the check valve

Reference

Industrial Hydraulics Manual, 5th ed., Maumee, OH: Eaton Hydraulics Training Services, 2008 p. 294.

Parameters (1)

medium

Value: Oil()

Type: Medium

Description: Medium in the component

Components (17)

medium

Type: Medium

Description: Medium in the component

tank1

Type: Tank

Description: Simple tank with constant pressure

tank2

Type: Tank

Description: Simple tank with constant pressure

pump

Type: Pump

Description: Model of a pump with fixed displacement and volumes

tank3

Type: Tank

Description: Simple tank with constant pressure

mass

Type: Mass

Description: Sliding mass with inertia

positionSensor

Type: PositionSensor

Description: Ideal sensor to measure the absolute position

cylinderDouble

Type: CylinderDouble

Description: Double cylinder model

const

Type: Constant

Description: Generate constant signal of type Real

constantSpeed

Type: ConstantSpeed

Description: Constant speed, not dependent on torque

pressureReliefValve

Type: PressureReliefValve

Description: Pressure valve, controlled by the pressure difference between the ports

min1

Type: Min

Description: Pass through the smallest signal

stopStep

Type: Step

Description: Generate step signal of type Real

startStep

Type: Step

Description: Generate step signal of type Real

controlValve

Type: PCVE43TandemCenter

Description: Electrically actuated proportional control valve with four ports and three states

gravitationalForce

Type: ConstantForce

Description: Constant force, not dependent on speed

counterBalanceValve

Type: CounterBalanceValve

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