補(bu)償(chang)器習(xi)慣上也叫(jiao)膨脹節，或(huo)伸縮節。由(you)構(gou)成(cheng)其工(gong)作主體的(de)(de)(de)波紋管(guan)(guan)(guan)（一種彈性元件(jian)(jian)）和端管(guan)(guan)(guan)、支架、法蘭、導(dao)管(guan)(guan)(guan)等(deng)附件(jian)(jian)組成(cheng)。 屬于一種補(bu)償(chang)元件(jian)(jian)。利(li)用(yong)其工(gong)作主體波紋管(guan)(guan)(guan)的(de)(de)(de)有效伸縮變形，以吸收管(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)、容(rong)器等(deng)由(you)熱(re)脹冷縮等(deng)原因(yin)而產生(sheng)的(de)(de)(de)尺寸變化，或(huo)補(bu)償(chang)管(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)、容(rong)器等(deng)的(de)(de)(de)軸向(xiang)、橫向(xiang)和角向(xiang)位移。也可用(yong)于降噪減(jian)振。在現代工(gong)業中用(yong)途(tu)廣泛。供熱(re)上，為(wei)了(le)防止供熱(re)管(guan)(guan)(guan)道(dao)升(sheng)溫時，由(you)于熱(re)伸長或(huo)溫度應(ying)力(li)而引起管(guan)(guan)(guan)道(dao)變形或(huo)破壞(huai)，需要在管(guan)(guan)(guan)道(dao)上設置補(bu)償(chang)器，以補(bu)償(chang)管(guan)(guan)(guan)道(dao)的(de)(de)(de)熱(re)伸長，從(cong)而減(jian)小管(guan)(guan)(guan)壁(bi)的(de)(de)(de)應(ying)力(li)和作用(yong)在閥件(jian)(jian)或(huo)支架結構(gou)上的(de)(de)(de)作用(yong)力(li)。