Liquid water valve model according to the IEC 534/ISA S.75 standards for valve sizing, incompressible fluid, with possible choked flow conditions.

Extends the ValveBase model (see the corresponding documentation for common valve features).

The model operating range includes choked flow operation, which takes place for low outlet pressures due to flashing in the vena contracta; otherwise, non-choking conditions are assumed.

The default liquid pressure recovery coefficient Fl is constant and given by the parameter Flnom. The relative change (per unit) of the recovery coefficient can be specified as a given function of the valve opening by customising the Flfun function.

If the flow coefficient is specified in terms of a nominal operating point, this should be in non-chocked conditions.


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