Similar to MAC-F but incorporating control units or tie rod system.
Expansion joints expand in length when under pressure. The force created by this pressure is designated as Pressure thrust.
Where the pipe supports and anchors are not designed to absorb this force, tie rods across the joint must be incorporated.
Tie rods are designed to take the full pressure thrust and tie rods supports are integrated in the flanges (retaining rings) so there is no thrust on counter flanges.
A control unit assembly is a system of 2 or more control rods placed across the expansion joint from flange to flange to set the maximum allowable expansion/contraction of the expansion joint and will absorb the pressure thrust.
Recommended on most applications to prevent damage due to excessive pipe movements, each rod incorporates double nuts on each end to keep the expansion joint from over elongating and spherical washers to allow lateral, angular and some angular movements.