In
the structure, this type is containing two bellows joined by a
center spool pipe and usually perform the function for the
absorbing any combination of the three basic movements, i.e,
axial movement, lateral offset and angular rotation.
In
hardware device, control rods used to be considered on design
for the purpose of distributing the movement between the two
bellows of this Expansion Joint and not subjected to the
bellows pressure thrust.
................................................................