双法兰伸缩器安装在管道线路上能够有效地补偿管道的轴向位移，并且能够大大缓解管道的轴向推力。
The double flange expander installed on the pipeline line can effectively compensate the axial displacement of the pipeline, and can greatly alleviate the axial thrust of the pipeline.
与此同时由于该伸缩器材质为锻钢或者是铸钢，能够有效地避免地陷或者是其他的地质活动对管道线路造成危害，并且极大的方便了管线后期的周期性的维护，只需要去掉双法兰伸缩器的螺母就能实现伸缩器和泵阀的拆装，方便了后期的维修。
At the same time, because the material of the expander is forged steel or cast steel, it can effectively avoid subsidence or other geological activities to the pipeline line damage, and greatly facilitates the periodic maintenance of the pipeline later on, only need to remove the nut of the double flange expander can realize the expansion and pump valve disassembly and assembly. Later maintenance.