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Our selection of expansion joints produced a series of expansion joints, the axial expansion joint to absorb axial displacement of the pipeline; lateral expansion joint to absorb the expansion joint axis perpendicular to the lateral displacement; Universal and small rod horizontal 2-3 type can absorb the displacement direction; angle-type expansion joints supporting the use of two or three, to absorb a single plane in one direction or more directions transverse deformation; universal angle type expansion joints, also to 2-3 supporting the use, can absorb lateral displacement in space systems in multiple directions. When expansion joints particular selection, the main factors to consider: nominal pipe diameter DN dates or flange connection size standards and their connection size. Working pressure P - should make P ≤Pd (design pressure), and stress evaluation bellows. Operating temperature T - considering temperature correction factor, check the design temperature. Material - depends on the medium properties and operating temperature. Compensation amount - Indication of the direction and size of compensation for displacement (axial, lateral, angular). Life - Consider using life or overhaul, replacement cycle. Is there a member thrust under pressure - pressure thrust restraint mechanism of expansion joints, which can be selected from constrained and unconstrained type.