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(bu)償(chang)元件。利用(yong)(yong)其工作主體波紋(wen)管(guan)(guan)(guan)(guan)的有效伸縮變形，以吸收管(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)、容器等(deng)由(you)熱(re)脹冷縮等(deng)原因(yin)而(er)產生的尺寸變化，或(huo)(huo)補(bu)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(jiao)向(xiang)位移。也(ye)可用(yong)(yong)于降噪減(jian)振。在(zai)現代(dai)工業中用(yong)(yong)途廣泛。供熱(re)上(shang)，為了防(fang)止供熱(re)管(guan)(guan)(guan)(guan)道(dao)升溫(wen)時，由(you)于熱(re)伸長或(huo)(huo)溫(wen)度(du)應力(li)而(er)引起管(guan)(guan)(guan)(guan)道(dao)變形或(huo)(huo)破壞，需要在(zai)管(guan)(guan)(guan)(guan)道(dao)上(shang)設置補(bu)償(chang)器，以補(bu)償(chang)管(guan)(guan)(guan)(guan)道(dao)的熱(re)伸長，從而(er)減(jian)小管(guan)(guan)(guan)(guan)壁的應力(li)和(he)作用(yong)(yong)在(zai)閥(fa)件或(huo)(huo)支(zhi)架結(jie)構上(shang)的作用(yong)(yong)力(li)。