補償(chang)(chang)器(qi)習慣上(shang)(shang)(shang)(shang)也叫膨(peng)脹節，或(huo)(huo)伸縮節。由構(gou)成其工(gong)作主體的波紋管(guan)(guan)(guan)(guan)（一種彈(dan)性元(yuan)件(jian)(jian)）和端(duan)管(guan)(guan)(guan)(guan)、支(zhi)(zhi)架、法(fa)蘭、導管(guan)(guan)(guan)(guan)等附件(jian)(jian)組成。 屬于一種補償(chang)(chang)元(yuan)件(jian)(jian)。利用(yong)其工(gong)作主體波紋管(guan)(guan)(guan)(guan)的有效(xiao)伸縮變(bian)形，以吸收管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容器(qi)等由熱脹冷(leng)縮等原(yuan)因而(er)產(chan)生的尺(chi)寸變(bian)化，或(huo)(huo)補償(chang)(chang)管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容器(qi)等的軸向(xiang)、橫向(xiang)和角向(xiang)位移。也可(ke)用(yong)于降噪減(jian)振。在現代(dai)工(gong)業中用(yong)途廣(guang)泛。供熱上(shang)(shang)(shang)(shang)，為了防止供熱管(guan)(guan)(guan)(guan)道(dao)升溫時，由于熱伸長或(huo)(huo)溫度應力(li)而(er)引起管(guan)(guan)(guan)(guan)道(dao)變(bian)形或(huo)(huo)破壞，需要(yao)在管(guan)(guan)(guan)(guan)道(dao)上(shang)(shang)(shang)(shang)設置補償(chang)(chang)器(qi)，以補償(chang)(chang)管(guan)(guan)(guan)(guan)道(dao)的熱伸長，從而(er)減(jian)小管(guan)(guan)(guan)(guan)壁的應力(li)和作用(yong)在閥件(jian)(jian)或(huo)(huo)支(zhi)(zhi)架結構(gou)上(shang)(shang)(shang)(shang)的作用(yong)力(li)。