補償(chang)器習慣上(shang)(shang)也叫膨(peng)脹節，或伸縮(suo)(suo)(suo)節。由構成其工(gong)作主(zhu)(zhu)體的波(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)（一種(zhong)彈性元件）和端管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、支架(jia)(jia)、法蘭(lan)、導管(guan)(guan)(guan)(guan)(guan)(guan)(guan)等(deng)附件組(zu)成。 屬于(yu)一種(zhong)補償(chang)元件。利(li)用(yong)其工(gong)作主(zhu)(zhu)體波(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的有效伸縮(suo)(suo)(suo)變(bian)形，以吸收管(guan)(guan)(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、容(rong)器等(deng)由熱脹冷縮(suo)(suo)(suo)等(deng)原(yuan)因而產生的尺寸變(bian)化，或補償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、容(rong)器等(deng)的軸向、橫向和角向位(wei)移。也可用(yong)于(yu)降(jiang)噪減振(zhen)。在(zai)現代工(gong)業(ye)中用(yong)途廣泛(fan)。供熱上(shang)(shang)，為了(le)防止供熱管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)升溫(wen)時(shi)，由于(yu)熱伸長(chang)或溫(wen)度應(ying)力(li)(li)而引起(qi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)變(bian)形或破壞，需要在(zai)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)(shang)設置補償(chang)器，以補償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)的熱伸長(chang)，從而減小管(guan)(guan)(guan)(guan)(guan)(guan)(guan)壁的應(ying)力(li)(li)和作用(yong)在(zai)閥件或支架(jia)(jia)結構上(shang)(shang)的作用(yong)力(li)(li)。