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)償元件。利用其工(gong)作(zuo)主(zhu)體波紋管(guan)(guan)(guan)(guan)的有(you)效伸(shen)縮變形(xing)，以(yi)吸收(shou)管(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)、容器(qi)等(deng)由熱(re)(re)(re)脹冷縮等(deng)原(yuan)因而(er)產生的尺(chi)寸變化(hua)，或補(bu)償管(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)、容器(qi)等(deng)的軸(zhou)向(xiang)(xiang)、橫(heng)向(xiang)(xiang)和(he)角向(xiang)(xiang)位移(yi)。也(ye)可用于降噪減(jian)(jian)振。在(zai)現代工(gong)業中(zhong)用途廣泛。供(gong)熱(re)(re)(re)上，為了(le)防止供(gong)熱(re)(re)(re)管(guan)(guan)(guan)(guan)道(dao)升溫(wen)時(shi)，由于熱(re)(re)(re)伸(shen)長或溫(wen)度應力而(er)引起管(guan)(guan)(guan)(guan)道(dao)變形(xing)或破壞，需要(yao)在(zai)管(guan)(guan)(guan)(guan)道(dao)上設置補(bu)償器(qi)，以(yi)補(bu)償管(guan)(guan)(guan)(guan)道(dao)的熱(re)(re)(re)伸(shen)長，從(cong)而(er)減(jian)(jian)小管(guan)(guan)(guan)(guan)壁(bi)的應力和(he)作(zuo)用在(zai)閥件或支架結構上的作(zuo)用力。