modelSpecificValveType
Specific technical valve types
Extends from ThermofluidStream.FlowControl.Internal.PartialValve.
Information
This valve models the behavior of specific valve types.
The technical type of the valve can be chosen (e.g. sliding valve). The characteristic curve is then set accordingly from a table for the zeta (flow resistance) values dependent on the valve opening.
To conclude the parameterization, a flow coefficient has to be set. Most data sheets of valves deliver a corresponding "KVs (CVs)"-Value. Otherwise a nominal mass-flow rate or a flow-diameter can be set.
For incompressible flow, the reference values for density (1g/cm3) and pressure (1bar) should be unchanged.
Reference values for standardized flow coefficients
When using Kvs, Cvs_US, or
Cvs_UK, the default values
dp_ref = 1 bar and
rho_ref = 1000 kg/m3 must not be modified.
assertionLevel.To test this behavior, a test model has been setup in ValveReferenceValues.Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Valve parameters | |||
| FlowCoeffType | flowCoefficient | FlowCoeffType.Kvs | Select type of flow coefficient |
| Real | Kvs | 0 | Kvs-value (metric) from data sheet (valve fully open) |
| Real | Cvs_US | 0 | Cvs-value (US [gal/min]) from data sheet (valve fully open) |
| Real | Cvs_UK | 0 | Cvs-value (UK [gal/min]) from data sheet (valve fully open, deprecated; use Kvs or Cvs_US instead) |
| SI.MassFlowRate | m_flow_ref_set | 0 | Reference mass flow rate |
| SI.Diameter | d_valve | 0 | Flow diameter |
| Advanced | |||
| AssertionLevel | assertionLevel | AssertionLevel.error | Assertion level for invalid reference values |
Contents
| Name | Description |
|---|---|
| zetaValueRecord |