補(bu)(bu)償(chang)器習慣上(shang)也(ye)叫(jiao)膨脹節(jie)，或伸縮節(jie)。由(you)構(gou)成其工作主體的(de)(de)波紋管(guan)(guan)(guan)（一(yi)種彈性元(yuan)件(jian)(jian)(jian)）和端管(guan)(guan)(guan)、支架、法(fa)蘭、導管(guan)(guan)(guan)等附件(jian)(jian)(jian)組成。 屬于(yu)一(yi)種補(bu)(bu)償(chang)元(yuan)件(jian)(jian)(jian)。利(li)用(yong)(yong)其工作主體波紋管(guan)(guan)(guan)的(de)(de)有效伸縮變(bian)形(xing)，以吸收管(guan)(guan)(guan)線、導管(guan)(guan)(guan)、容器等由(you)熱脹冷(leng)縮等原因而(er)產(chan)生的(de)(de)尺(chi)寸變(bian)化，或補(bu)(bu)償(chang)管(guan)(guan)(guan)線、導管(guan)(guan)(guan)、容器等的(de)(de)軸向(xiang)(xiang)、橫向(xiang)(xiang)和角向(xiang)(xiang)位移。也(ye)可用(yong)(yong)于(yu)降噪減振。在現(xian)代工業中用(yong)(yong)途廣泛。供(gong)熱上(shang)，為(wei)了(le)防止(zhi)供(gong)熱管(guan)(guan)(guan)道升溫時(shi)，由(you)于(yu)熱伸長或溫度應(ying)力而(er)引起(qi)管(guan)(guan)(guan)道變(bian)形(xing)或破(po)壞，需要(yao)在管(guan)(guan)(guan)道上(shang)設(she)置補(bu)(bu)償(chang)器，以補(bu)(bu)償(chang)管(guan)(guan)(guan)道的(de)(de)熱伸長，從而(er)減小管(guan)(guan)(guan)壁(bi)的(de)(de)應(ying)力和作用(yong)(yong)在閥件(jian)(jian)(jian)或支架結構(gou)上(shang)的(de)(de)作用(yong)(yong)力。