Depressurization of a reservoir with high pressure gas by opening a valve

I'm newbie in modelica and I'm trying to simulate a epressurization of a tank with high pressure hydrogen gas by opening a valve. The idea is to verify the change in flow through the valve with the decrease in pressure over time in the reservoir.

The only model that I see suitable for this is the Modelica.Fluid.Vessels.ClosedVolume.

But I having trouble to model this, because I getting this error.

The initialization finished successfully with 3 homotopy steps. The following assertion has been violated at time 5.000000 ((valveOpening.y >= 0.0 and valveOpening.y <= 1.0)) --> "Variable violating min/max constraint: 0.0 <= valveOpening.y <= 1.0, has value: 1" The arguments u_min and u_max provided in the function call solveOneNonlinearEquation(f,u_min,u_max) do not bracket the root of the single non-linear equation 0=f(u): u_min = 200 u_max = 6000 fa = f(u_min) = 11416.4 fb = f(u_max) = 1.04699e+08 fa and fb must have opposite sign which is not the case Process crashed

Is this the best way to solve my problem?

Judging from the error message, it seems you have configured valveOpening to output values greater than one. This violates the max condition in this line

Modelica.Blocks.Interfaces.RealInput opening(min=0,max=1)

of the valve (Modelica.Fluid.Valves.ValveLinear).

Unfortunately, it is not possible to be sure that this is the error as you didn't post code for the model...