補償(chang)器習(xi)慣上(shang)也叫(jiao)膨脹(zhang)節，或(huo)伸縮(suo)節。由(you)構(gou)成其(qi)工(gong)作(zuo)(zuo)主體的(de)(de)波(bo)紋管(guan)(guan)(guan)(guan)(guan)（一(yi)種(zhong)彈性(xing)元件）和(he)端(duan)管(guan)(guan)(guan)(guan)(guan)、支架、法蘭、導(dao)管(guan)(guan)(guan)(guan)(guan)等(deng)(deng)(deng)附件組成。 屬于一(yi)種(zhong)補償(chang)元件。利用(yong)(yong)(yong)其(qi)工(gong)作(zuo)(zuo)主體波(bo)紋管(guan)(guan)(guan)(guan)(guan)的(de)(de)有效伸縮(suo)變形，以吸收(shou)管(guan)(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)(guan)、容(rong)器等(deng)(deng)(deng)由(you)熱脹(zhang)冷縮(suo)等(deng)(deng)(deng)原(yuan)因而(er)產生的(de)(de)尺寸變化，或(huo)補償(chang)管(guan)(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)(guan)、容(rong)器等(deng)(deng)(deng)的(de)(de)軸向、橫向和(he)角向位移(yi)。也可用(yong)(yong)(yong)于降噪減(jian)振(zhen)。在(zai)現代工(gong)業(ye)中用(yong)(yong)(yong)途(tu)廣泛。供熱上(shang)，為了防止供熱管(guan)(guan)(guan)(guan)(guan)道(dao)升溫(wen)時，由(you)于熱伸長或(huo)溫(wen)度應力(li)而(er)引起管(guan)(guan)(guan)(guan)(guan)道(dao)變形或(huo)破壞，需要在(zai)管(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)設置補償(chang)器，以補償(chang)管(guan)(guan)(guan)(guan)(guan)道(dao)的(de)(de)熱伸長，從而(er)減(jian)小管(guan)(guan)(guan)(guan)(guan)壁的(de)(de)應力(li)和(he)作(zuo)(zuo)用(yong)(yong)(yong)在(zai)閥(fa)件或(huo)支架結(jie)構(gou)上(shang)的(de)(de)作(zuo)(zuo)用(yong)(yong)(yong)力(li)。