補償(chang)器習(xi)慣上也(ye)叫膨脹節，或(huo)(huo)伸(shen)(shen)(shen)縮(suo)節。由(you)構成(cheng)其工(gong)作(zuo)主體的(de)(de)(de)波紋(wen)管(guan)(guan)(guan)(guan)(guan)（一(yi)(yi)種彈性元(yuan)件(jian)(jian)）和(he)(he)端管(guan)(guan)(guan)(guan)(guan)、支架、法蘭、導(dao)管(guan)(guan)(guan)(guan)(guan)等(deng)附件(jian)(jian)組成(cheng)。 屬于一(yi)(yi)種補償(chang)元(yuan)件(jian)(jian)。利用(yong)其工(gong)作(zuo)主體波紋(wen)管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)有效伸(shen)(shen)(shen)縮(suo)變(bian)形(xing)，以吸收管(guan)(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)(guan)、容器等(deng)由(you)熱(re)(re)脹冷(leng)縮(suo)等(deng)原(yuan)因而產生的(de)(de)(de)尺寸變(bian)化，或(huo)(huo)補償(chang)管(guan)(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)(guan)、容器等(deng)的(de)(de)(de)軸(zhou)向、橫向和(he)(he)角向位(wei)移。也(ye)可(ke)用(yong)于降噪減(jian)振。在(zai)(zai)(zai)現代工(gong)業中用(yong)途廣泛。供(gong)熱(re)(re)上，為了防(fang)止供(gong)熱(re)(re)管(guan)(guan)(guan)(guan)(guan)道升溫(wen)時，由(you)于熱(re)(re)伸(shen)(shen)(shen)長或(huo)(huo)溫(wen)度應力而引起管(guan)(guan)(guan)(guan)(guan)道變(bian)形(xing)或(huo)(huo)破壞，需要在(zai)(zai)(zai)管(guan)(guan)(guan)(guan)(guan)道上設置補償(chang)器，以補償(chang)管(guan)(guan)(guan)(guan)(guan)道的(de)(de)(de)熱(re)(re)伸(shen)(shen)(shen)長，從而減(jian)小(xiao)管(guan)(guan)(guan)(guan)(guan)壁(bi)的(de)(de)(de)應力和(he)(he)作(zuo)用(yong)在(zai)(zai)(zai)閥件(jian)(jian)或(huo)(huo)支架結構上的(de)(de)(de)作(zuo)用(yong)力。