補償(chang)(chang)器習慣上(shang)也叫膨(peng)脹(zhang)(zhang)節(jie)，或(huo)伸縮節(jie)。由構成其(qi)工作主(zhu)體的波(bo)紋管(guan)(guan)(guan)（一種彈性元件(jian)）和端管(guan)(guan)(guan)、支(zhi)架、法蘭、導管(guan)(guan)(guan)等(deng)附件(jian)組成。 屬于(yu)(yu)一種補償(chang)(chang)元件(jian)。利用(yong)(yong)其(qi)工作主(zhu)體波(bo)紋管(guan)(guan)(guan)的有效(xiao)伸縮變(bian)形，以(yi)吸(xi)收(shou)管(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)、容器等(deng)由熱(re)脹(zhang)(zhang)冷縮等(deng)原(yuan)因(yin)而(er)產生的尺寸變(bian)化，或(huo)補償(chang)(chang)管(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)、容器等(deng)的軸向、橫向和角向位(wei)移。也可用(yong)(yong)于(yu)(yu)降噪減振。在現代工業中(zhong)用(yong)(yong)途廣(guang)泛(fan)。供(gong)熱(re)上(shang)，為了(le)防(fang)止(zhi)供(gong)熱(re)管(guan)(guan)(guan)道(dao)升(sheng)溫(wen)(wen)時，由于(yu)(yu)熱(re)伸長或(huo)溫(wen)(wen)度應力而(er)引起管(guan)(guan)(guan)道(dao)變(bian)形或(huo)破壞，需(xu)要在管(guan)(guan)(guan)道(dao)上(shang)設置(zhi)補償(chang)(chang)器，以(yi)補償(chang)(chang)管(guan)(guan)(guan)道(dao)的熱(re)伸長，從(cong)而(er)減小管(guan)(guan)(guan)壁的應力和作用(yong)(yong)在閥件(jian)或(huo)支(zhi)架結構上(shang)的作用(yong)(yong)力。