補償(chang)器習慣(guan)上也叫膨脹節，或(huo)伸(shen)縮(suo)節。由(you)構成其(qi)工(gong)作主體的(de)(de)波(bo)紋(wen)管(guan)(guan)(guan)（一種彈性元(yuan)件）和端管(guan)(guan)(guan)、支(zhi)架(jia)、法蘭、導(dao)管(guan)(guan)(guan)等(deng)附(fu)件組(zu)成。 屬于(yu)一種補償(chang)元(yuan)件。利用(yong)(yong)其(qi)工(gong)作主體波(bo)紋(wen)管(guan)(guan)(guan)的(de)(de)有效伸(shen)縮(suo)變(bian)形(xing)(xing)，以吸收(shou)管(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)、容(rong)器等(deng)由(you)熱(re)(re)脹冷(leng)縮(suo)等(deng)原因而(er)(er)產(chan)生的(de)(de)尺寸變(bian)化，或(huo)補償(chang)管(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)、容(rong)器等(deng)的(de)(de)軸向(xiang)、橫向(xiang)和角向(xiang)位移(yi)。也可用(yong)(yong)于(yu)降噪減(jian)振。在現(xian)代工(gong)業中用(yong)(yong)途廣泛。供熱(re)(re)上，為(wei)了防止供熱(re)(re)管(guan)(guan)(guan)道升(sheng)溫時，由(you)于(yu)熱(re)(re)伸(shen)長或(huo)溫度應力(li)而(er)(er)引起管(guan)(guan)(guan)道變(bian)形(xing)(xing)或(huo)破壞，需要在管(guan)(guan)(guan)道上設置(zhi)補償(chang)器，以補償(chang)管(guan)(guan)(guan)道的(de)(de)熱(re)(re)伸(shen)長，從而(er)(er)減(jian)小管(guan)(guan)(guan)壁的(de)(de)應力(li)和作用(yong)(yong)在閥件或(huo)支(zhi)架(jia)結構上的(de)(de)作用(yong)(yong)力(li)。