補償器習慣上(shang)也叫膨(peng)脹(zhang)節，或(huo)(huo)(huo)伸(shen)縮(suo)(suo)節。由構(gou)(gou)成其工(gong)(gong)(gong)作(zuo)主(zhu)體(ti)的(de)波紋管(guan)(guan)(guan)(guan)(guan)（一種(zhong)(zhong)彈性元件）和端管(guan)(guan)(guan)(guan)(guan)、支(zhi)架、法蘭、導(dao)管(guan)(guan)(guan)(guan)(guan)等(deng)附件組成。 屬(shu)于一種(zhong)(zhong)補償元件。利用其工(gong)(gong)(gong)作(zuo)主(zhu)體(ti)波紋管(guan)(guan)(guan)(guan)(guan)的(de)有效伸(shen)縮(suo)(suo)變形，以(yi)(yi)吸(xi)收(shou)管(guan)(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)(guan)、容器等(deng)由熱脹(zhang)冷縮(suo)(suo)等(deng)原因(yin)而產生(sheng)的(de)尺寸變化，或(huo)(huo)(huo)補償管(guan)(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)(guan)、容器等(deng)的(de)軸向(xiang)、橫向(xiang)和角向(xiang)位(wei)移。也可用于降噪(zao)減振。在現代工(gong)(gong)(gong)業中(zhong)用途廣泛。供(gong)熱上(shang)，為了防止(zhi)供(gong)熱管(guan)(guan)(guan)(guan)(guan)道升溫時，由于熱伸(shen)長或(huo)(huo)(huo)溫度應(ying)力而引起管(guan)(guan)(guan)(guan)(guan)道變形或(huo)(huo)(huo)破(po)壞(huai)，需要在管(guan)(guan)(guan)(guan)(guan)道上(shang)設置補償器，以(yi)(yi)補償管(guan)(guan)(guan)(guan)(guan)道的(de)熱伸(shen)長，從而減小管(guan)(guan)(guan)(guan)(guan)壁的(de)應(ying)力和作(zuo)用在閥件或(huo)(huo)(huo)支(zhi)架結(jie)構(gou)(gou)上(shang)的(de)作(zuo)用力。