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(zhong)補(bu)償(chang)元(yuan)件。利用(yong)其工(gong)作(zuo)(zuo)主(zhu)體(ti)波紋管(guan)(guan)(guan)(guan)的(de)有效伸縮變形(xing)，以(yi)吸收管(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)、容器(qi)(qi)等(deng)(deng)由熱(re)(re)(re)(re)脹冷縮等(deng)(deng)原因(yin)而產生的(de)尺寸(cun)變化，或(huo)補(bu)償(chang)管(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)、容器(qi)(qi)等(deng)(deng)的(de)軸向(xiang)、橫向(xiang)和角(jiao)向(xiang)位移(yi)。也可用(yong)于降噪減振。在(zai)現(xian)代工(gong)業中用(yong)途(tu)廣泛。供(gong)(gong)熱(re)(re)(re)(re)上，為(wei)了防止供(gong)(gong)熱(re)(re)(re)(re)管(guan)(guan)(guan)(guan)道(dao)升(sheng)溫時，由于熱(re)(re)(re)(re)伸長或(huo)溫度應力而引起管(guan)(guan)(guan)(guan)道(dao)變形(xing)或(huo)破(po)壞(huai)，需要(yao)在(zai)管(guan)(guan)(guan)(guan)道(dao)上設置補(bu)償(chang)器(qi)(qi)，以(yi)補(bu)償(chang)管(guan)(guan)(guan)(guan)道(dao)的(de)熱(re)(re)(re)(re)伸長，從而減小管(guan)(guan)(guan)(guan)壁的(de)應力和作(zuo)(zuo)用(yong)在(zai)閥件或(huo)支架結構上的(de)作(zuo)(zuo)用(yong)力。