補(bu)(bu)償器(qi)(qi)習(xi)慣上(shang)也叫膨脹(zhang)節，或(huo)伸(shen)(shen)縮(suo)節。由構(gou)(gou)成其(qi)工(gong)作(zuo)(zuo)主(zhu)體的(de)(de)(de)(de)(de)波(bo)紋管(guan)(guan)(guan)(guan)(guan)(guan)（一(yi)種彈性元件(jian)）和(he)(he)端管(guan)(guan)(guan)(guan)(guan)(guan)、支架、法(fa)蘭(lan)、導管(guan)(guan)(guan)(guan)(guan)(guan)等附件(jian)組成。 屬于(yu)一(yi)種補(bu)(bu)償元件(jian)。利(li)用(yong)其(qi)工(gong)作(zuo)(zuo)主(zhu)體波(bo)紋管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)(de)有(you)效伸(shen)(shen)縮(suo)變(bian)形(xing)，以(yi)吸收管(guan)(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)(guan)、容器(qi)(qi)等由熱(re)脹(zhang)冷縮(suo)等原(yuan)因(yin)而產生的(de)(de)(de)(de)(de)尺寸變(bian)化，或(huo)補(bu)(bu)償管(guan)(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)(guan)、容器(qi)(qi)等的(de)(de)(de)(de)(de)軸向、橫向和(he)(he)角(jiao)向位移。也可用(yong)于(yu)降噪減振。在(zai)現代工(gong)業(ye)中(zhong)用(yong)途廣泛。供(gong)熱(re)上(shang)，為了防止供(gong)熱(re)管(guan)(guan)(guan)(guan)(guan)(guan)道升溫時，由于(yu)熱(re)伸(shen)(shen)長或(huo)溫度應(ying)力(li)而引起(qi)管(guan)(guan)(guan)(guan)(guan)(guan)道變(bian)形(xing)或(huo)破壞(huai)，需要(yao)在(zai)管(guan)(guan)(guan)(guan)(guan)(guan)道上(shang)設置補(bu)(bu)償器(qi)(qi)，以(yi)補(bu)(bu)償管(guan)(guan)(guan)(guan)(guan)(guan)道的(de)(de)(de)(de)(de)熱(re)伸(shen)(shen)長，從而減小管(guan)(guan)(guan)(guan)(guan)(guan)壁的(de)(de)(de)(de)(de)應(ying)力(li)和(he)(he)作(zuo)(zuo)用(yong)在(zai)閥(fa)件(jian)或(huo)支架結構(gou)(gou)上(shang)的(de)(de)(de)(de)(de)作(zuo)(zuo)用(yong)力(li)。