補償(chang)器(qi)習慣上(shang)也(ye)叫膨脹節(jie)，或(huo)伸縮節(jie)。由構成其工(gong)作主(zhu)體的波紋管(guan)(guan)(guan)(guan)（一(yi)種彈(dan)性元(yuan)件(jian)）和端管(guan)(guan)(guan)(guan)、支(zhi)架、法(fa)蘭、導管(guan)(guan)(guan)(guan)等附件(jian)組成。 屬于(yu)一(yi)種補償(chang)元(yuan)件(jian)。利用(yong)(yong)(yong)其工(gong)作主(zhu)體波紋管(guan)(guan)(guan)(guan)的有效(xiao)伸縮變(bian)形，以吸收管(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)、容(rong)器(qi)等由熱(re)(re)脹冷縮等原因而(er)產生的尺寸變(bian)化，或(huo)補償(chang)管(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)、容(rong)器(qi)等的軸向(xiang)、橫向(xiang)和角向(xiang)位移。也(ye)可用(yong)(yong)(yong)于(yu)降噪(zao)減振。在現(xian)代工(gong)業中用(yong)(yong)(yong)途廣(guang)泛(fan)。供熱(re)(re)上(shang)，為了防止供熱(re)(re)管(guan)(guan)(guan)(guan)道升(sheng)溫(wen)時，由于(yu)熱(re)(re)伸長(chang)或(huo)溫(wen)度應力(li)而(er)引(yin)起管(guan)(guan)(guan)(guan)道變(bian)形或(huo)破壞，需要(yao)在管(guan)(guan)(guan)(guan)道上(shang)設置補償(chang)器(qi)，以補償(chang)管(guan)(guan)(guan)(guan)道的熱(re)(re)伸長(chang)，從(cong)而(er)減小管(guan)(guan)(guan)(guan)壁的應力(li)和作用(yong)(yong)(yong)在閥件(jian)或(huo)支(zhi)架結(jie)構上(shang)的作用(yong)(yong)(yong)力(li)。