補(bu)(bu)償(chang)器習慣上(shang)也(ye)叫(jiao)膨脹節(jie)，或(huo)伸(shen)(shen)縮節(jie)。由構成(cheng)其工(gong)(gong)作主體的波紋(wen)管（一種彈性元件(jian)）和(he)端管、支(zhi)架、法蘭、導(dao)管等(deng)(deng)附件(jian)組成(cheng)。 屬于一種補(bu)(bu)償(chang)元件(jian)。利(li)用(yong)(yong)其工(gong)(gong)作主體波紋(wen)管的有效伸(shen)(shen)縮變(bian)形，以吸收管線、導(dao)管、容(rong)器等(deng)(deng)由熱(re)脹冷縮等(deng)(deng)原(yuan)因而(er)產生(sheng)的尺寸變(bian)化，或(huo)補(bu)(bu)償(chang)管線、導(dao)管、容(rong)器等(deng)(deng)的軸向(xiang)(xiang)、橫向(xiang)(xiang)和(he)角向(xiang)(xiang)位(wei)移。也(ye)可用(yong)(yong)于降噪減(jian)振。在現代工(gong)(gong)業中用(yong)(yong)途廣(guang)泛(fan)。供(gong)熱(re)上(shang)，為(wei)了防止供(gong)熱(re)管道(dao)升溫時，由于熱(re)伸(shen)(shen)長或(huo)溫度應(ying)(ying)力而(er)引起管道(dao)變(bian)形或(huo)破(po)壞，需要在管道(dao)上(shang)設置補(bu)(bu)償(chang)器，以補(bu)(bu)償(chang)管道(dao)的熱(re)伸(shen)(shen)長，從(cong)而(er)減(jian)小(xiao)管壁(bi)的應(ying)(ying)力和(he)作用(yong)(yong)在閥件(jian)或(huo)支(zhi)架結(jie)構上(shang)的作用(yong)(yong)力。