補償器習慣上也叫膨脹節，或伸縮節。由構成其工作主體的波紋管（一種彈性元件）和端管、支架、法蘭、導管等附件組成。膨脹節廠家 屬于一種補償元件(jian)。利(li)用(yong)(yong)(yong)其工作主體波紋管(guan)(guan)(guan)(guan)的有效伸縮(suo)變(bian)形，以(yi)(yi)吸收管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容(rong)器等(deng)(deng)由(you)熱脹冷縮(suo)等(deng)(deng)原因而產生的尺寸變(bian)化，或補償管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容(rong)器等(deng)(deng)的軸向、橫向和角向位移。也可用(yong)(yong)(yong)于降噪減(jian)振。在現代(dai)工業中用(yong)(yong)(yong)途廣(guang)泛。供熱上(shang)，為了防止(zhi)供熱管(guan)(guan)(guan)(guan)道(dao)升溫時，由(you)于熱伸長或溫度應(ying)(ying)力(li)而引起(qi)管(guan)(guan)(guan)(guan)道(dao)變(bian)形或破壞，需要在管(guan)(guan)(guan)(guan)道(dao)上(shang)設(she)置補償器，以(yi)(yi)補償管(guan)(guan)(guan)(guan)道(dao)的熱伸長，從而減(jian)小(xiao)管(guan)(guan)(guan)(guan)壁的應(ying)(ying)力(li)和作用(yong)(yong)(yong)在閥件(jian)或支架結構上(shang)的作用(yong)(yong)(yong)力(li)。