補償器習(xi)慣上(shang)也(ye)叫(jiao)膨脹節，或伸(shen)(shen)縮節。由構(gou)成其工作(zuo)(zuo)主(zhu)體的(de)(de)波紋(wen)管(guan)(guan)(guan)(guan)(guan)(guan)（一(yi)種(zhong)彈(dan)性元(yuan)件(jian)）和(he)端(duan)管(guan)(guan)(guan)(guan)(guan)(guan)、支(zhi)架、法蘭、導管(guan)(guan)(guan)(guan)(guan)(guan)等(deng)(deng)附件(jian)組(zu)成。 屬于(yu)(yu)一(yi)種(zhong)補償元(yuan)件(jian)。利用其工作(zuo)(zuo)主(zhu)體波紋(wen)管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)有(you)效(xiao)伸(shen)(shen)縮變形，以吸收管(guan)(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)(guan)、容(rong)器等(deng)(deng)由熱脹冷(leng)縮等(deng)(deng)原因而產(chan)生的(de)(de)尺(chi)寸變化，或補償管(guan)(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)(guan)、容(rong)器等(deng)(deng)的(de)(de)軸向(xiang)、橫(heng)向(xiang)和(he)角向(xiang)位(wei)移。也(ye)可用于(yu)(yu)降噪(zao)減振(zhen)。在(zai)(zai)現代(dai)工業中用途廣泛。供熱上(shang)，為了防止供熱管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)升溫(wen)時(shi)，由于(yu)(yu)熱伸(shen)(shen)長或溫(wen)度應力(li)(li)而引起管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)變形或破壞，需要在(zai)(zai)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)設置(zhi)補償器，以補償管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)的(de)(de)熱伸(shen)(shen)長，從(cong)而減小管(guan)(guan)(guan)(guan)(guan)(guan)壁的(de)(de)應力(li)(li)和(he)作(zuo)(zuo)用在(zai)(zai)閥件(jian)或支(zhi)架結構(gou)上(shang)的(de)(de)作(zuo)(zuo)用力(li)(li)。