The direction of the arrow on the expansion joint indicatesDirection of media flow。 This identification helps to ensure that the expansion joint is properly adapted and responded to the flow direction of the medium in the pipe when installed and used, thus effectively performing its functions such as compensation, cushioning, and shock absorption. Therefore, when installing the expansion joint, it is important to pay attention to the consistency of the direction of the arrow with the flow direction of the medium in the pipe to ensure the correct installation and use of the expansion joint.