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WOLFRAM SYSTEM MODELER

CheckValve

Check valve with lumped volumes

Diagram

Wolfram Language

In[1]:=

SystemModel["Hydraulic.Valves.DirectionalControl.CheckValve"]

Out[1]:=

Information

This is a model of a check valve with lumped volumes. If the pressure difference is higher than pMin, the valve begins to open; when the pressure difference has reached pMax, the valve is completely open. If the pressure is less than pMin, the valve is closed and has only leakage flow. This behavior makes the component only allow flow in one direction. The ball is modeled with a spool with first-order dynamics; see SpoolH.

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. 184.

Parameters (8)

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
A	Value: 0.001 Type: Area (m²) Description: Opening area when opened
Cd	Value: 0.62 Type: Real Description: Coefficient of discharge for the opening
pMax	Value: 100000.0 Type: Pressure (Pa) Description: Pressure when valve is fully open
pMin	Value: 100 Type: Pressure (Pa) Description: Pressure when valve starts to open
t1	Value: 0.001 Type: Time (s) Description: Time constant for first-order system

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
	checkValve	Type: CheckValve Description: Static check valve
	volume_a	Type: Volume Description: Fixed volume with fluid storage
	volume_b	Type: Volume Description: Fixed volume with fluid storage

Used in Examples (5)

	AccumulatorChargingCircuit Hydraulic.Examples.Accumulators Example circuit with an unloading relief valve and an accumulator
	AutomaticAccumulatorDischarge Hydraulic.Examples.Accumulators Example circuit with automatic discharge of an accumulator
	AccumulatorAndCylinderCircuit Hydraulic.Examples.Accumulators Example circuit with an accumulator and cylinder
	MeterOut Hydraulic.Examples.FlowControl Example circuit with meter-out flow control
	SubCircuitWithReducedPressure Hydraulic.Examples.MultipleActuators Example circuit with a sub-circuit operating at a reduced pressure

Used in Components (3)

OneWayFlowControlValve

Hydraulic.Valves.FlowControl

Assembly with a restriction and check valve

CounterBalanceValve

Hydraulic.Valves.FlowControl

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

BrakeValve

Hydraulic.Valves.FlowControl

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