.ThermoPower.Choices.Valve.CvTypes .ThermoPower.Choices.Valve.CvTypesType, constants and menu choices to select the type of Cv data
type CvTypes = enumeration(Av "Av (metric) flow coefficient", Kv "Kv (metric) flow coefficient", Cv "Cv (US) flow coefficient", OpPoint "Av defined by nominal operating point");