Whether the screw of the expansion joint needs to be removed depends mainly on the specific use situation and installation requirements.

First, the screw of the expansion joint is usually used as a support and fixed expansion joint to prevent its lateral or longitudinal displacement during operation. If the pipeline needs to bear a certain pressure during operation, then the screw cannot be removed, because once removed, the expansion joint may not be able to maintain a stable shape, and it is easy to be deformed or damaged by external forces. In this case, removing the screw may cause the resistance of the piping system to decrease and affect the normal operation of the entire piping system.

However, in certain specific circumstances, such as when maintenance and repair of the piping system is required, temporary removal of the screw of the expansion joint may be required. But before removal, it must be ensured that the expansion joint does not fall due to the weight of the piping system above, causing personal injury or damage to other equipment. In addition, when reinstalling the screw, it must be ensured that its length, position and angle are consistent with the requirements of the expansion joint to ensure the normal operation of the pipeline system.

Generally speaking, whether the screw of the expansion joint needs to be removed should be judged according to the specific use situation and installation requirements. In cases of uncertainty, it is recommended to consult a professional engineer or manufacturer to ensure safe and correct operation.