補(bu)償器(qi)習慣上(shang)也叫膨(peng)脹節，或(huo)伸縮節。由(you)構成(cheng)其工(gong)作主體的波紋管(guan)(guan)(guan)(guan)(guan)(guan)（一種(zhong)彈性(xing)元件）和(he)(he)端管(guan)(guan)(guan)(guan)(guan)(guan)、支(zhi)(zhi)架(jia)、法(fa)蘭、導管(guan)(guan)(guan)(guan)(guan)(guan)等附件組成(cheng)。 屬于一種(zhong)補(bu)償元件。利用(yong)其工(gong)作主體波紋管(guan)(guan)(guan)(guan)(guan)(guan)的有效伸縮變(bian)(bian)形(xing)，以吸收管(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)等由(you)熱脹冷縮等原因而產生的尺寸變(bian)(bian)化，或(huo)補(bu)償管(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)等的軸向、橫向和(he)(he)角向位移。也可用(yong)于降噪(zao)減(jian)振。在現代工(gong)業中用(yong)途廣(guang)泛。供熱上(shang)，為(wei)了防止供熱管(guan)(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)而引起管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)變(bian)(bian)形(xing)或(huo)破壞，需要在管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)設置補(bu)償器(qi)，以補(bu)償管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)的熱伸長，從而減(jian)小管(guan)(guan)(guan)(guan)(guan)(guan)壁的應力(li)和(he)(he)作用(yong)在閥(fa)件或(huo)支(zhi)(zhi)架(jia)結構上(shang)的作用(yong)力(li)。