補償(chang)器習慣(guan)上(shang)也叫膨脹節，或伸縮(suo)節。由(you)構(gou)(gou)成其工(gong)(gong)作(zuo)主體的(de)(de)(de)(de)波(bo)紋(wen)(wen)管(guan)(guan)(guan)(guan)（一種彈性元件(jian)）和端管(guan)(guan)(guan)(guan)、支架、法蘭、導管(guan)(guan)(guan)(guan)等(deng)附件(jian)組成。 屬于(yu)一種補償(chang)元件(jian)。利用(yong)(yong)(yong)其工(gong)(gong)作(zuo)主體波(bo)紋(wen)(wen)管(guan)(guan)(guan)(guan)的(de)(de)(de)(de)有效伸縮(suo)變形，以吸收管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容(rong)(rong)器等(deng)由(you)熱脹冷縮(suo)等(deng)原因(yin)而(er)產生的(de)(de)(de)(de)尺寸變化，或補償(chang)管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容(rong)(rong)器等(deng)的(de)(de)(de)(de)軸(zhou)向(xiang)、橫向(xiang)和角向(xiang)位(wei)移。也可用(yong)(yong)(yong)于(yu)降(jiang)噪(zao)減振。在現代工(gong)(gong)業中用(yong)(yong)(yong)途廣泛。供熱上(shang)，為了(le)防(fang)止供熱管(guan)(guan)(guan)(guan)道升(sheng)溫(wen)時，由(you)于(yu)熱伸長或溫(wen)度應力(li)(li)而(er)引起管(guan)(guan)(guan)(guan)道變形或破壞，需要在管(guan)(guan)(guan)(guan)道上(shang)設(she)置補償(chang)器，以補償(chang)管(guan)(guan)(guan)(guan)道的(de)(de)(de)(de)熱伸長，從(cong)而(er)減小(xiao)管(guan)(guan)(guan)(guan)壁的(de)(de)(de)(de)應力(li)(li)和作(zuo)用(yong)(yong)(yong)在閥件(jian)或支架結構(gou)(gou)上(shang)的(de)(de)(de)(de)作(zuo)用(yong)(yong)(yong)力(li)(li)。