補償器(qi)(qi)習慣(guan)上(shang)也叫(jiao)膨(peng)脹(zhang)節，或(huo)(huo)伸(shen)縮(suo)節。由構成其(qi)工(gong)作主體(ti)的波紋管(guan)(guan)(guan)(guan)（一種(zhong)彈性元件(jian)(jian)）和端管(guan)(guan)(guan)(guan)、支(zhi)架、法蘭、導管(guan)(guan)(guan)(guan)等(deng)附件(jian)(jian)組成。 屬于一種(zhong)補償元件(jian)(jian)。利用其(qi)工(gong)作主體(ti)波紋管(guan)(guan)(guan)(guan)的有效伸(shen)縮(suo)變(bian)形(xing)，以(yi)吸收管(guan)(guan)(guan)(guan)線(xian)(xian)、導管(guan)(guan)(guan)(guan)、容器(qi)(qi)等(deng)由熱(re)脹(zhang)冷縮(suo)等(deng)原因(yin)而(er)產生的尺寸變(bian)化，或(huo)(huo)補償管(guan)(guan)(guan)(guan)線(xian)(xian)、導管(guan)(guan)(guan)(guan)、容器(qi)(qi)等(deng)的軸向(xiang)、橫(heng)向(xiang)和角(jiao)向(xiang)位移。也可用于降噪(zao)減(jian)振。在(zai)現代工(gong)業中(zhong)用途廣泛。供熱(re)上(shang)，為了防止供熱(re)管(guan)(guan)(guan)(guan)道升溫時，由于熱(re)伸(shen)長(chang)或(huo)(huo)溫度(du)應(ying)(ying)力(li)(li)(li)而(er)引(yin)起管(guan)(guan)(guan)(guan)道變(bian)形(xing)或(huo)(huo)破壞，需(xu)要在(zai)管(guan)(guan)(guan)(guan)道上(shang)設置補償器(qi)(qi)，以(yi)補償管(guan)(guan)(guan)(guan)道的熱(re)伸(shen)長(chang)，從而(er)減(jian)小管(guan)(guan)(guan)(guan)壁的應(ying)(ying)力(li)(li)(li)和作用在(zai)閥件(jian)(jian)或(huo)(huo)支(zhi)架結(jie)構上(shang)的作用力(li)(li)(li)。