補償(chang)器習慣上(shang)(shang)也叫膨(peng)脹(zhang)節(jie)(jie)，或(huo)伸縮節(jie)(jie)。由構(gou)成(cheng)其工(gong)作主體的(de)(de)波(bo)紋管(guan)(guan)(guan)(guan)（一種(zhong)彈(dan)性(xing)元件(jian)(jian)）和(he)端管(guan)(guan)(guan)(guan)、支架、法(fa)蘭、導(dao)管(guan)(guan)(guan)(guan)等附件(jian)(jian)組成(cheng)。 屬于一種(zhong)補償(chang)元件(jian)(jian)。利用(yong)其工(gong)作主體波(bo)紋管(guan)(guan)(guan)(guan)的(de)(de)有(you)效伸縮變形，以吸收管(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)、容器等由熱脹(zhang)冷縮等原因而(er)產生的(de)(de)尺寸(cun)變化，或(huo)補償(chang)管(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)、容器等的(de)(de)軸向、橫(heng)向和(he)角向位移。也可用(yong)于降噪減(jian)振。在現代工(gong)業(ye)中用(yong)途廣泛(fan)。供熱上(shang)(shang)，為(wei)了防(fang)止供熱管(guan)(guan)(guan)(guan)道(dao)升溫時，由于熱伸長或(huo)溫度應力(li)而(er)引(yin)起管(guan)(guan)(guan)(guan)道(dao)變形或(huo)破壞，需(xu)要在管(guan)(guan)(guan)(guan)道(dao)上(shang)(shang)設(she)置補償(chang)器，以補償(chang)管(guan)(guan)(guan)(guan)道(dao)的(de)(de)熱伸長，從而(er)減(jian)小管(guan)(guan)(guan)(guan)壁的(de)(de)應力(li)和(he)作用(yong)在閥件(jian)(jian)或(huo)支架結構(gou)上(shang)(shang)的(de)(de)作用(yong)力(li)。