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Navigation: Library > Iconic Diagrams > Hydraulics > Valves > CounterbalanceValve |
  
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Iconic Diagrams\Hydraulics\Valves
Domains: Continuous. Size: 1-D. Kind: Iconic Diagrams (Hydraulics).
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 parasitic volumes.
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.
Ports |
Description |
pa, pb pt. |
Both terminals of the hydraulic component. |
Causality |
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fixed volume flow out pa fixed volume flow out pb fixed volume flow out pt |
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Parameters |
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CheckValve\pclosed CheckValve\popen CheckValve\Q_nom |
Valve is closed under this pressure [Pa]. Valve is fully open above this pressure [Pa]. Turbulent flow at nominal pressure drop [m3/s]. |
CheckValve\Q_leak |
Leakage flow at nominal pressure drop, make 1e-12 if unknown [m3/s]. |
PressureReliefValve\pclosed PressureReliefValve\popen PressureReliefValve\GLeak PressureReliefValve\GOpen Va\V Va\p_initial Vb\V Vb\p_initial Vt\V 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]. Conductance of open valve [m3/s.Pa]. Volume of oil under pressure [m3] (hidden) The starting pressure of the volume [Pa] (hidden) Volume of oil under pressure [m3] (hidden) The starting pressure of the volume [Pa] (hidden) Volume of oil under pressure [m3] (hidden) The starting pressure of the volume [Pa] (hidden) |