Purpose of these expansion joints is compensation of axial movements in direction of longitudinal axis of expansion joint. Movements can be positive (elongation of the bellows) and negative (compression of the bellows).
Bellows are made of stainless steel and nickel alloys as single ply or multy-ply. End connection of expansion joint as per request of customer can be flange, welding pipe-end or combination. Additional elements of expansion joint are internal sleeves, external shroud and others according to needs and requirements of customer.