補償(chang)器習慣上(shang)也叫膨(peng)脹節，或伸(shen)縮(suo)(suo)節。由構成其(qi)(qi)工(gong)作主(zhu)(zhu)體的波紋管(guan)(guan)(guan)(guan)（一種彈性元件）和(he)端管(guan)(guan)(guan)(guan)、支架、法(fa)蘭、導管(guan)(guan)(guan)(guan)等(deng)附件組成。 屬于一種補償(chang)元件。利(li)用(yong)其(qi)(qi)工(gong)作主(zhu)(zhu)體波紋管(guan)(guan)(guan)(guan)的有(you)效伸(shen)縮(suo)(suo)變(bian)形(xing)，以吸(xi)收管(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)、容器等(deng)由熱(re)(re)脹冷縮(suo)(suo)等(deng)原(yuan)因(yin)而(er)產生的尺(chi)寸變(bian)化(hua)，或補償(chang)管(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)、容器等(deng)的軸向(xiang)、橫向(xiang)和(he)角向(xiang)位移。也可用(yong)于降噪減振。在(zai)現(xian)代(dai)工(gong)業中用(yong)途廣泛。供(gong)熱(re)(re)上(shang)，為了防止供(gong)熱(re)(re)管(guan)(guan)(guan)(guan)道(dao)升(sheng)溫時，由于熱(re)(re)伸(shen)長或溫度應力而(er)引起管(guan)(guan)(guan)(guan)道(dao)變(bian)形(xing)或破壞(huai)，需要(yao)在(zai)管(guan)(guan)(guan)(guan)道(dao)上(shang)設置補償(chang)器，以補償(chang)管(guan)(guan)(guan)(guan)道(dao)的熱(re)(re)伸(shen)長，從而(er)減小管(guan)(guan)(guan)(guan)壁(bi)的應力和(he)作用(yong)在(zai)閥件或支架結構上(shang)的作用(yong)力。