補償(chang)器(qi)習慣(guan)上(shang)也叫(jiao)膨脹(zhang)節，或伸(shen)縮(suo)節。由(you)構成其工(gong)作(zuo)(zuo)主體(ti)(ti)的(de)波紋管(guan)(guan)(guan)(guan)（一(yi)種(zhong)彈性(xing)元(yuan)件）和(he)端管(guan)(guan)(guan)(guan)、支(zhi)架、法蘭、導(dao)管(guan)(guan)(guan)(guan)等附件組成。 屬于一(yi)種(zhong)補償(chang)元(yuan)件。利用(yong)其工(gong)作(zuo)(zuo)主體(ti)(ti)波紋管(guan)(guan)(guan)(guan)的(de)有效伸(shen)縮(suo)變(bian)(bian)形，以(yi)吸收管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容器(qi)等由(you)熱(re)脹(zhang)冷縮(suo)等原因(yin)而(er)產生的(de)尺寸變(bian)(bian)化，或補償(chang)管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容器(qi)等的(de)軸(zhou)向、橫向和(he)角向位移。也可用(yong)于降噪減振。在現代工(gong)業中(zhong)用(yong)途廣泛。供熱(re)上(shang)，為了防止供熱(re)管(guan)(guan)(guan)(guan)道升溫時，由(you)于熱(re)伸(shen)長或溫度應力而(er)引起管(guan)(guan)(guan)(guan)道變(bian)(bian)形或破(po)壞，需要在管(guan)(guan)(guan)(guan)道上(shang)設置(zhi)補償(chang)器(qi)，以(yi)補償(chang)管(guan)(guan)(guan)(guan)道的(de)熱(re)伸(shen)長，從(cong)而(er)減小管(guan)(guan)(guan)(guan)壁的(de)應力和(he)作(zuo)(zuo)用(yong)在閥件或支(zhi)架結構上(shang)的(de)作(zuo)(zuo)用(yong)力。