補償(chang)器(qi)習(xi)慣上(shang)(shang)(shang)(shang)也叫膨脹節(jie)，或伸(shen)縮節(jie)。由(you)構成(cheng)(cheng)其(qi)工(gong)作(zuo)主體的(de)波(bo)紋(wen)管(guan)(guan)(guan)(guan)（一種(zhong)彈(dan)性元件(jian)）和(he)端(duan)管(guan)(guan)(guan)(guan)、支架、法蘭、導(dao)管(guan)(guan)(guan)(guan)等(deng)附件(jian)組成(cheng)(cheng)。 屬于(yu)一種(zhong)補償(chang)元件(jian)。利(li)用(yong)(yong)其(qi)工(gong)作(zuo)主體波(bo)紋(wen)管(guan)(guan)(guan)(guan)的(de)有效伸(shen)縮變形，以吸收管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容(rong)器(qi)等(deng)由(you)熱(re)(re)脹冷縮等(deng)原因而(er)產生的(de)尺(chi)寸(cun)變化，或補償(chang)管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容(rong)器(qi)等(deng)的(de)軸向、橫(heng)向和(he)角向位(wei)移(yi)。也可用(yong)(yong)于(yu)降噪減(jian)振。在現代工(gong)業(ye)中用(yong)(yong)途廣泛。供熱(re)(re)上(shang)(shang)(shang)(shang)，為了防(fang)止供熱(re)(re)管(guan)(guan)(guan)(guan)道(dao)升溫時，由(you)于(yu)熱(re)(re)伸(shen)長或溫度應力而(er)引起(qi)管(guan)(guan)(guan)(guan)道(dao)變形或破壞，需要(yao)在管(guan)(guan)(guan)(guan)道(dao)上(shang)(shang)(shang)(shang)設(she)置補償(chang)器(qi)，以補償(chang)管(guan)(guan)(guan)(guan)道(dao)的(de)熱(re)(re)伸(shen)長，從(cong)而(er)減(jian)小管(guan)(guan)(guan)(guan)壁的(de)應力和(he)作(zuo)用(yong)(yong)在閥件(jian)或支架結構上(shang)(shang)(shang)(shang)的(de)作(zuo)用(yong)(yong)力。