PressureControlValve
Library
HydraulicsByFluidon/Components/Valves/PressureValves
Description
The component PressureControlValve is a model of a 3-port pressure control valve. It maintains a largely constant outlet pressure even at a variable (higher) supply pressure. In addition to a 2-port pressure reducing valve it also reduces the outlet pressure to tank.
If supply pressure pA is less than Set pressure (relative value) the valve acts like an orifice with the characteristics Nominal volume flow and Nominal pressure difference.
For all pressures deviating from Set pressure (relative value) the valve opens and the flow increases linearly following the slope given by parameters Nominal volume flow and Pressure drop. For flow P->A the outlet pressure deviates by Deviation P-A @ Nominal volume flow and by Deviation P-A @ -Nominal volume flow for flow A->T.
The component PressureControlValve is not a model of a pressure control valve according to its physical structure. It merely represents the characteristic behavior of a pressure control valve. Therefore dynamic effects such as forces due to inertia will not be represented.
Parameters
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
mo_SetPressure | SetPressure | Set pressure (relative value) | Scalar | |
mo_DeviationPA | DeviationPA | Deviation P-A | Scalar | |
mo_DeviationAT | DeviationAT | Deviation A-T | Scalar | |
mo_gain | gain | Controller gain | Scalar | |
mo_NominalVolumeFlow | NominalVolumeFlow | Nominal volume flow | Scalar | |
mo_NominalPressureDifference | NominalPressureDifference | Nominal pressure difference | Scalar | |
mo_ReferenceDensity | ReferenceDensity | Reference density for volume flow and pressure difference | Scalar | |
mo_timeConst | timeConst | Response time of valve spool | Scalar | |
mo_deadVolume | deadVolume | Dead volume at ports | Scalar | |
mo_SetPressureAbs | SetPressureAbs | Scalar | ||
mo_relX | relX | relX | Structure | |
mo_relX/fixed | fixed | Cell of scalars | true | |
mo_relX/start | start | Cell of scalars | ||
mo_pP | pP | pP | Structure | |
mo_pP/fixed | fixed | Cell of scalars | true | |
mo_pP/start | start | Cell of scalars | ||
mo_pT | pT | pT | Structure | |
mo_pT/fixed | fixed | Cell of scalars | true | |
mo_pT/start | start | Cell of scalars | ||
mo_pA | pA | pA | Structure | |
mo_pA/fixed | fixed | Cell of scalars | true | |
mo_pA/start | start | Cell of scalars |
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
mo__nmodifiers | Number of Modifiers | Specifies the number of modifiers | Number | |
mo__modifiers | Modifiers | Add new modifier | Structure | |
mo__modifiers/varname | Variable name | Cell of strings | 'volumeFlowP' | |
mo__modifiers/attribute | Attribute | Cell of strings | 'start' | |
mo__modifiers/value | Value |
Ports
| Name | Type | Description | IO Type | Number |
|---|---|---|---|---|
portA | implicit | Hydraulic port A | input | 1 |
portP | implicit | Hydraulic port P | input | 2 |
portT | implicit | Hydraulic port T | input | 3 |