補(bu)償器(qi)(qi)習慣上(shang)(shang)也叫膨(peng)脹節，或伸(shen)(shen)縮節。由構(gou)成(cheng)(cheng)其工(gong)作(zuo)主體的波紋管(guan)(guan)(guan)(guan)（一種彈性元件(jian)）和(he)端管(guan)(guan)(guan)(guan)、支(zhi)架、法蘭、導管(guan)(guan)(guan)(guan)等(deng)附(fu)件(jian)組(zu)成(cheng)(cheng)。 屬于一種補(bu)償元件(jian)。利用(yong)其工(gong)作(zuo)主體波紋管(guan)(guan)(guan)(guan)的有效伸(shen)(shen)縮變(bian)(bian)形，以吸收管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容器(qi)(qi)等(deng)由熱(re)(re)(re)脹冷縮等(deng)原因而(er)產生的尺寸變(bian)(bian)化，或補(bu)償管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容器(qi)(qi)等(deng)的軸向、橫(heng)向和(he)角向位移(yi)。也可用(yong)于降噪減振。在(zai)現代工(gong)業中用(yong)途廣(guang)泛。供熱(re)(re)(re)上(shang)(shang)，為了防(fang)止供熱(re)(re)(re)管(guan)(guan)(guan)(guan)道升(sheng)溫時，由于熱(re)(re)(re)伸(shen)(shen)長或溫度應(ying)力而(er)引起管(guan)(guan)(guan)(guan)道變(bian)(bian)形或破壞，需要在(zai)管(guan)(guan)(guan)(guan)道上(shang)(shang)設(she)置補(bu)償器(qi)(qi)，以補(bu)償管(guan)(guan)(guan)(guan)道的熱(re)(re)(re)伸(shen)(shen)長，從而(er)減小管(guan)(guan)(guan)(guan)壁的應(ying)力和(he)作(zuo)用(yong)在(zai)閥件(jian)或支(zhi)架結(jie)構(gou)上(shang)(shang)的作(zuo)用(yong)力。