補償(chang)(chang)器習(xi)慣(guan)上也叫膨(peng)脹節，或(huo)伸(shen)縮(suo)節。由構成其(qi)工作主體的(de)波(bo)紋管(guan)(guan)(guan)(guan)(guan)(guan)（一種彈(dan)性元件）和(he)端管(guan)(guan)(guan)(guan)(guan)(guan)、支架(jia)、法蘭、導管(guan)(guan)(guan)(guan)(guan)(guan)等附件組成。 屬(shu)于(yu)一種補償(chang)(chang)元件。利用(yong)(yong)(yong)(yong)其(qi)工作主體波(bo)紋管(guan)(guan)(guan)(guan)(guan)(guan)的(de)有效伸(shen)縮(suo)變(bian)形，以吸(xi)收管(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)、容器等由熱(re)脹冷(leng)縮(suo)等原(yuan)因(yin)而產生的(de)尺寸變(bian)化，或(huo)補償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)、容器等的(de)軸(zhou)向(xiang)(xiang)、橫向(xiang)(xiang)和(he)角(jiao)向(xiang)(xiang)位移。也可(ke)用(yong)(yong)(yong)(yong)于(yu)降噪減振。在(zai)現代工業中用(yong)(yong)(yong)(yong)途廣(guang)泛。供(gong)熱(re)上，為了防止供(gong)熱(re)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)升溫時，由于(yu)熱(re)伸(shen)長或(huo)溫度應力(li)(li)而引(yin)起管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)變(bian)形或(huo)破壞，需要在(zai)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)上設(she)置(zhi)補償(chang)(chang)器，以補償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)的(de)熱(re)伸(shen)長，從而減小管(guan)(guan)(guan)(guan)(guan)(guan)壁的(de)應力(li)(li)和(he)作用(yong)(yong)(yong)(yong)在(zai)閥件或(huo)支架(jia)結構上的(de)作用(yong)(yong)(yong)(yong)力(li)(li)。