When the pipeline medium is lower than 20 ℃, the pipeline is affected by temperature contraction, when the ductile iron double flange limit expansion joint elongates. When the medium is above 20 ℃, the pipeline expands and elongates, and the compensator compresses. When the medium remains unchanged at 20 ℃, the ductile iron double flange limit expansion joint remains in place. Steam pipeline will expand and elongate after being heated, if this elongation is not absorbed effectively, it will cause damage to the pipe support by thrust, and in serious cases, it will cause the pipe to fall off. The function of ductile iron double flange limit expansion joint is to absorb the amount of pipeline expansion. From the appearance, the pipeline expansion joint is contracted when the pipeline is in the hot state and elongated when it is cold.
