6 DOF - compute_force_and_moment

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Hi everybody, I'm looking for someone who has some experience with the 6 DOF solver and the macro/function Compute_Force_And_Moment. I have a rotating valve in a cylinder. I want the valve to rotate around its center of gravity according to the hydrodynamical forces on it. I wrote a UDF where I blocked all translations with prop[SDOF_LOAD_F_X]= prop[SDOF_LOAD_F_Y]= prop[SDOF_LOAD_F_Z]=0 and rotations around 2 axis prop[SDOF_LOAD_M_X]=prop[SDOF_LOAD_M_Y]=0. Here are my questions. I have to recalculate the the moments around the Z axis(SDOF_LOAD_M_Z) with the compute_force_and_moment macro/function. How do I do that? Secondly I want the rotation around the Z axis to be restricted between 0 and say 30°. Is it possible and if yes how do i accomplish that? Do I use the DEFINE_CG_MOTION macro?

Thanks for all your remarks and input! I really appreciate it! On/On