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(yu)一(yi)種補(bu)(bu)償(chang)(chang)元件。利用(yong)其工(gong)作(zuo)(zuo)主(zhu)體波紋管(guan)(guan)的有效伸(shen)縮(suo)變形，以吸收管(guan)(guan)線(xian)、導管(guan)(guan)、容(rong)器等由(you)熱(re)(re)(re)(re)(re)脹冷縮(suo)等原因而產生(sheng)的尺寸變化，或補(bu)(bu)償(chang)(chang)管(guan)(guan)線(xian)、導管(guan)(guan)、容(rong)器等的軸(zhou)向(xiang)、橫向(xiang)和角向(xiang)位移。也(ye)可用(yong)于(yu)降(jiang)噪減振。在(zai)現(xian)代工(gong)業(ye)中用(yong)途廣泛。供(gong)(gong)熱(re)(re)(re)(re)(re)上，為了防止供(gong)(gong)熱(re)(re)(re)(re)(re)管(guan)(guan)道升溫時，由(you)于(yu)熱(re)(re)(re)(re)(re)伸(shen)長或溫度應力而引起(qi)管(guan)(guan)道變形或破壞，需(xu)要在(zai)管(guan)(guan)道上設(she)置補(bu)(bu)償(chang)(chang)器，以補(bu)(bu)償(chang)(chang)管(guan)(guan)道的熱(re)(re)(re)(re)(re)伸(shen)長，從(cong)而減小管(guan)(guan)壁(bi)的應力和作(zuo)(zuo)用(yong)在(zai)閥件或支架結構上的作(zuo)(zuo)用(yong)力。