補償器習慣上也叫膨脹節，或伸縮節。由構成其工作主體的波紋管（一種彈性元件）和端管、支架、法蘭、導管等附件組成。膨脹節廠家 屬于(yu)一種(zhong)補償(chang)元件。利用(yong)其(qi)工(gong)作(zuo)主體波紋(wen)管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)有效伸(shen)(shen)(shen)縮變(bian)(bian)形(xing)，以(yi)吸收管(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)、容器(qi)等由(you)熱(re)脹(zhang)冷縮等原因(yin)而產生的(de)(de)尺寸變(bian)(bian)化，或(huo)補償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)、容器(qi)等的(de)(de)軸(zhou)向(xiang)、橫向(xiang)和角向(xiang)位移。也可用(yong)于(yu)降噪(zao)減振。在(zai)現代(dai)工(gong)業中用(yong)途廣(guang)泛。供熱(re)上，為了防止供熱(re)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)升(sheng)溫時，由(you)于(yu)熱(re)伸(shen)(shen)(shen)長或(huo)溫度應力(li)而引起管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)變(bian)(bian)形(xing)或(huo)破壞，需要在(zai)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)上設置補償(chang)器(qi)，以(yi)補償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)的(de)(de)熱(re)伸(shen)(shen)(shen)長，從而減小管(guan)(guan)(guan)(guan)(guan)(guan)壁(bi)的(de)(de)應力(li)和作(zuo)用(yong)在(zai)閥件或(huo)支(zhi)架結構上的(de)(de)作(zuo)用(yong)力(li)。