This is a container class for three-way valve models from Buildings.Fluid.Actuators.Valves.
The parameter typCha allows configuring the model
by selecting the valve characteristic to be used based on the
enumeration
Buildings.Fluid.HydronicConfigurations.Types.ValveCharacteristic.
The default setting for the ratio of the Kvs coefficient
between the bypass branch and the direct branch is
fraK=1.0, see
Buildings.Fluid.HydronicConfigurations.UsersGuide.ControlValves
for the justification.