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Navigation: Library > Iconic Diagrams > Hydraulics > Valves > LoopFlushingValve-States |
  
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Iconic Diagrams\Hydraulics\Valves
Domains: Continuous. Size: 1-D. Kind: Iconic Diagrams (Hydraulics).
This model describes a loop flushing valve with parasitic volumes.
Loop flushing valves are used to maintain a high quality working fluid in closed hydraulic circuits. In closed hydraulic circuits the oil is continuously flowing from a pump to an actuator. A loop flushing valve allows the oil to leave the circuit for cooling and filtering. If one side (pa) of the valve has a higher pressure, oil will flow from the other side (pb) out of the closed circuit and vice versa.
The circuit is always equipped (not shown above) with a charge pump to keep the suction side of the pump on a pre-pressure to avoid cavitation and so damage to the pump, and to exchange the fluid that is flushed.
Loop flushing valves are spring operated. I.e. a certain pressure difference between port a and b is required to open the valve. This pressure can be adjusted and is indicated by the parameter p_sw.
A small pressure difference is required to turn a valve from completely closed to completely opened. This overlap pressure is indicated by the parameter p_o.
Overlap pressure [Pa]. |
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LoopFlushingValve\p_sw |
Switching pressure [Pa]. |
LoopFlushingValve\Q_nom |
Turbulent flow at nominal pressure drop [m3/s]. |
LoopFlushingValve\p_nom |
Nominal pressure [Pa]. |
Bandwidth of the spool dynamics [Hz], f > 0, (hidden). |
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Damping of the spool dynamics [], d > 0, (hidden). |
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LoopFlushingValve\GLeak |
Conductance of the laminar leakage flows [m3/s.Pa], GLeak >= 0. (hidden). |
V1\V V1\p_initial V2\V V2\p_initial V3\V V3\p_initial |
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). |