id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
1973	Problem with initial equations affecting valve models in Modelica.Fluid	Francesco Casella	Lennart Ochel	"The PartialValve model in Modelica.Fluid had a wrong, redundant binding equation Av = 0, which resulted in getting Av = 0 with all choices of the CvData parameter except CvTypes.Av. This has now been fixed in r5718 of the MSL trunk, so the Av = 0 equation no longer shows up in the flattened model.

However, there is still some problem in the back-end. Please consider the attached test case, which is a Dymola Save Total containing the corrected Modelica model: nonwithstanding the initial equation 

{{{
Av = Cv2Av*Cv
}}}

in the PartialValve model, valve.Cv = 1.4 but valve.Av = 0. As a result, all valve models that do not set the Av parameter directly always compute a wrong zero mass flow rate, regardless of the working conditions.

Can some of the back-end people have a look at that?"	defect	closed	critical	1.9.0	Backend	trunk	fixed		Jens Frenkel Willi Braun Lennart Ochel