補償(chang)(chang)器習慣上(shang)也(ye)叫膨脹節，或(huo)(huo)(huo)伸(shen)(shen)縮(suo)節。由構成其工(gong)作主(zhu)體(ti)的波紋管(guan)(guan)(guan)(guan)(guan)（一種彈(dan)性(xing)元件）和端(duan)管(guan)(guan)(guan)(guan)(guan)、支架、法蘭(lan)、導管(guan)(guan)(guan)(guan)(guan)等(deng)附件組成。 屬于(yu)一種補償(chang)(chang)元件。利用(yong)其工(gong)作主(zhu)體(ti)波紋管(guan)(guan)(guan)(guan)(guan)的有效伸(shen)(shen)縮(suo)變(bian)形(xing)，以吸收管(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)、容器等(deng)由熱脹冷縮(suo)等(deng)原因(yin)而(er)產生(sheng)的尺寸變(bian)化(hua)，或(huo)(huo)(huo)補償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)、容器等(deng)的軸向(xiang)、橫向(xiang)和角向(xiang)位移(yi)。也(ye)可用(yong)于(yu)降噪減(jian)振。在現代工(gong)業(ye)中用(yong)途廣泛(fan)。供(gong)熱上(shang)，為了防止供(gong)熱管(guan)(guan)(guan)(guan)(guan)道(dao)升溫(wen)時，由于(yu)熱伸(shen)(shen)長(chang)或(huo)(huo)(huo)溫(wen)度應力而(er)引起管(guan)(guan)(guan)(guan)(guan)道(dao)變(bian)形(xing)或(huo)(huo)(huo)破壞，需要在管(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)設置補償(chang)(chang)器，以補償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)道(dao)的熱伸(shen)(shen)長(chang)，從而(er)減(jian)小管(guan)(guan)(guan)(guan)(guan)壁的應力和作用(yong)在閥件或(huo)(huo)(huo)支架結構上(shang)的作用(yong)力。