補(bu)償(chang)器習(xi)慣上(shang)(shang)也叫(jiao)膨脹節，或(huo)伸(shen)縮節。由(you)構(gou)成其工(gong)作(zuo)主體的(de)(de)波紋(wen)(wen)管(guan)(guan)(guan)(guan)(guan)(guan)（一(yi)種(zhong)彈性元件(jian)(jian)）和端管(guan)(guan)(guan)(guan)(guan)(guan)、支架、法蘭、導(dao)(dao)管(guan)(guan)(guan)(guan)(guan)(guan)等(deng)附件(jian)(jian)組成。 屬于一(yi)種(zhong)補(bu)償(chang)元件(jian)(jian)。利用其工(gong)作(zuo)主體波紋(wen)(wen)管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)有(you)效伸(shen)縮變(bian)形(xing)，以吸(xi)收(shou)管(guan)(guan)(guan)(guan)(guan)(guan)線、導(dao)(dao)管(guan)(guan)(guan)(guan)(guan)(guan)、容器等(deng)由(you)熱(re)(re)脹冷縮等(deng)原因而產生的(de)(de)尺寸變(bian)化，或(huo)補(bu)償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)線、導(dao)(dao)管(guan)(guan)(guan)(guan)(guan)(guan)、容器等(deng)的(de)(de)軸向、橫(heng)向和角向位移。也可用于降(jiang)噪減(jian)振。在現(xian)代工(gong)業中用途廣泛。供熱(re)(re)上(shang)(shang)，為了(le)防止供熱(re)(re)管(guan)(guan)(guan)(guan)(guan)(guan)道升(sheng)溫(wen)時，由(you)于熱(re)(re)伸(shen)長或(huo)溫(wen)度應(ying)力而引起管(guan)(guan)(guan)(guan)(guan)(guan)道變(bian)形(xing)或(huo)破壞，需要在管(guan)(guan)(guan)(guan)(guan)(guan)道上(shang)(shang)設(she)置(zhi)補(bu)償(chang)器，以補(bu)償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)道的(de)(de)熱(re)(re)伸(shen)長，從而減(jian)小管(guan)(guan)(guan)(guan)(guan)(guan)壁的(de)(de)應(ying)力和作(zuo)用在閥件(jian)(jian)或(huo)支架結構(gou)上(shang)(shang)的(de)(de)作(zuo)用力。