補償(chang)器(qi)習慣上(shang)也叫膨脹節，或伸(shen)(shen)縮節。由(you)構成其工作主體的波紋(wen)管(guan)(guan)(guan)(guan)（一種(zhong)彈性元件）和端管(guan)(guan)(guan)(guan)、支(zhi)架(jia)、法蘭(lan)、導管(guan)(guan)(guan)(guan)等(deng)(deng)附件組成。 屬(shu)于一種(zhong)補償(chang)元件。利用(yong)其工作主體波紋(wen)管(guan)(guan)(guan)(guan)的有效(xiao)伸(shen)(shen)縮變形(xing)，以(yi)吸收管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容器(qi)等(deng)(deng)由(you)熱(re)(re)(re)(re)脹冷縮等(deng)(deng)原因而(er)產生的尺寸變化，或補償(chang)管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容器(qi)等(deng)(deng)的軸向、橫(heng)向和角向位移。也可用(yong)于降噪減(jian)振。在現代工業中(zhong)用(yong)途廣(guang)泛。供熱(re)(re)(re)(re)上(shang)，為了防止供熱(re)(re)(re)(re)管(guan)(guan)(guan)(guan)道(dao)升(sheng)溫(wen)時，由(you)于熱(re)(re)(re)(re)伸(shen)(shen)長或溫(wen)度應力而(er)引起管(guan)(guan)(guan)(guan)道(dao)變形(xing)或破壞，需要在管(guan)(guan)(guan)(guan)道(dao)上(shang)設(she)置補償(chang)器(qi)，以(yi)補償(chang)管(guan)(guan)(guan)(guan)道(dao)的熱(re)(re)(re)(re)伸(shen)(shen)長，從而(er)減(jian)小管(guan)(guan)(guan)(guan)壁(bi)的應力和作用(yong)在閥件或支(zhi)架(jia)結(jie)構上(shang)的作用(yong)力。