補(bu)(bu)償器(qi)習慣上(shang)也叫膨(peng)脹(zhang)節，或(huo)(huo)伸(shen)(shen)縮節。由(you)構(gou)成其(qi)工作主體的(de)波(bo)紋(wen)管(guan)(guan)（一(yi)種彈性元件(jian)(jian)）和(he)端管(guan)(guan)、支架、法(fa)蘭、導(dao)管(guan)(guan)等(deng)附件(jian)(jian)組成。 屬于(yu)一(yi)種補(bu)(bu)償元件(jian)(jian)。利用(yong)(yong)其(qi)工作主體波(bo)紋(wen)管(guan)(guan)的(de)有(you)效伸(shen)(shen)縮變形(xing)，以吸收管(guan)(guan)線、導(dao)管(guan)(guan)、容(rong)器(qi)等(deng)由(you)熱脹(zhang)冷縮等(deng)原因(yin)而產生的(de)尺寸(cun)變化，或(huo)(huo)補(bu)(bu)償管(guan)(guan)線、導(dao)管(guan)(guan)、容(rong)器(qi)等(deng)的(de)軸向(xiang)(xiang)(xiang)、橫向(xiang)(xiang)(xiang)和(he)角向(xiang)(xiang)(xiang)位(wei)移。也可用(yong)(yong)于(yu)降噪(zao)減振。在現(xian)代工業中用(yong)(yong)途廣泛(fan)。供熱上(shang)，為了(le)防止供熱管(guan)(guan)道(dao)升溫(wen)時，由(you)于(yu)熱伸(shen)(shen)長或(huo)(huo)溫(wen)度應力而引起管(guan)(guan)道(dao)變形(xing)或(huo)(huo)破壞，需要在管(guan)(guan)道(dao)上(shang)設(she)置補(bu)(bu)償器(qi)，以補(bu)(bu)償管(guan)(guan)道(dao)的(de)熱伸(shen)(shen)長，從而減小(xiao)管(guan)(guan)壁的(de)應力和(he)作用(yong)(yong)在閥件(jian)(jian)或(huo)(huo)支架結構(gou)上(shang)的(de)作用(yong)(yong)力。