Where can I get the values applied in inflexibility of the tab for a board Victaulic? (Axial, trans, bending and Torsion Stiff and effective ID

What about the values dela pressure of the upstream and downstream of the union Victaulic? I ask because I feel that the pressure before a union Victaulic should be zero (not the element that is located downstream from the union Victaulic?.

There are other considerations that should be taken into account?