CounterbalanceValve

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CounterbalanceValve

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Iconic Diagrams\Hydraulics\Valves

Use

Domains: Continuous. Size: 1-D. Kind: Iconic Diagrams (Hydraulics).

Description

This model an externally piloted counter balance valve. The model consists of an externally piloted pressure relief valve with a check valve in parallel. The ports of the model are connected to lumped volumes.

CounterBalanceValve

 

The Counterbalance valve is applied as a brake valve to get a positive control on a hydraulic cylinder or motor with a negative load. The check valve is used to get a free running actuator in one direction and the pressure relief valve is used to control the actuator in the other direction. The relief valve is controlled by the external pilot pressure.

Interface

Ports

Description

pa, pb

pt.

Both terminals of the hydraulic component.

Causality

 

fixed volume flow out pa

fixed volume flow out pb

fixed volume flow out pt

 

Parameters

 

CheckValve\pclosed

CheckValve\popen

CheckValve\GLeak

CheckValve\A

CheckValve\Cd

PressureReliefValve\pclosed

PressureReliefValve\popen

PressureReliefValve\GLeak

PressureReliefValve\GOpen

Va\V

Va\B

Va\p_initial

Vb\V

Vb\B

Vb\p_initial

Vt\V

Vt\B

Vt\p_initial

Valve is closed under this pressure [Pa].

Valve is fully open above this pressure [Pa].

Conductance of closed valve [m3/s.Pa].

Maximum valve area when the valve is open [m2], A >= 0!

Discharge coefficient [].

Valve is closed under this pressure [Pa].

Valve is fully open above this pressure [Pa].

Conductance of closed valve [m3/s.Pa].

Conductance of open valve [m3/s.Pa].

Volume of oil under pressure [m3]

Effective bulk modulus [Pa]

The starting pressure of the volume [Pa]

Volume of oil under pressure [m3]

Effective bulk modulus [Pa]

The starting pressure of the volume [Pa]

Volume of oil under pressure [m3]

Effective bulk modulus [Pa]

The starting pressure of the volume [Pa]