補(bu)償(chang)(chang)(chang)器(qi)習(xi)慣上也叫膨脹(zhang)節，或(huo)(huo)伸(shen)縮(suo)節。由(you)構(gou)成(cheng)其工(gong)作主體的波紋管(guan)(guan)(guan)(guan)(guan)(guan)（一(yi)種(zhong)(zhong)彈(dan)性元件(jian)）和端管(guan)(guan)(guan)(guan)(guan)(guan)、支(zhi)架、法蘭、導(dao)管(guan)(guan)(guan)(guan)(guan)(guan)等(deng)附件(jian)組成(cheng)。 屬(shu)于一(yi)種(zhong)(zhong)補(bu)償(chang)(chang)(chang)元件(jian)。利用(yong)其工(gong)作主體波紋管(guan)(guan)(guan)(guan)(guan)(guan)的有效(xiao)伸(shen)縮(suo)變(bian)形，以(yi)(yi)吸收管(guan)(guan)(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)等(deng)由(you)熱脹(zhang)冷縮(suo)等(deng)原因(yin)而(er)(er)(er)產生(sheng)的尺(chi)寸變(bian)化，或(huo)(huo)補(bu)償(chang)(chang)(chang)管(guan)(guan)(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)等(deng)的軸向(xiang)、橫向(xiang)和角向(xiang)位(wei)移。也可用(yong)于降噪減振。在(zai)現(xian)代工(gong)業(ye)中用(yong)途廣泛。供(gong)熱上，為了(le)防(fang)止供(gong)熱管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)升溫(wen)時，由(you)于熱伸(shen)長(chang)或(huo)(huo)溫(wen)度應力(li)而(er)(er)(er)引起管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)變(bian)形或(huo)(huo)破壞，需要在(zai)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)上設置補(bu)償(chang)(chang)(chang)器(qi)，以(yi)(yi)補(bu)償(chang)(chang)(chang)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)的熱伸(shen)長(chang)，從(cong)而(er)(er)(er)減小管(guan)(guan)(guan)(guan)(guan)(guan)壁的應力(li)和作用(yong)在(zai)閥(fa)件(jian)或(huo)(huo)支(zhi)架結構(gou)上的作用(yong)力(li)。