補(bu)償器習慣上也叫(jiao)膨(peng)脹節，或伸(shen)(shen)縮節。由構(gou)成(cheng)其工(gong)(gong)(gong)作(zuo)(zuo)主體的(de)(de)波紋(wen)管(guan)(guan)(guan)（一(yi)種(zhong)彈(dan)性元件(jian)）和(he)端管(guan)(guan)(guan)、支架(jia)、法蘭(lan)、導管(guan)(guan)(guan)等附件(jian)組成(cheng)。 屬于一(yi)種(zhong)補(bu)償元件(jian)。利用(yong)其工(gong)(gong)(gong)作(zuo)(zuo)主體波紋(wen)管(guan)(guan)(guan)的(de)(de)有效伸(shen)(shen)縮變(bian)(bian)形(xing)，以吸收管(guan)(guan)(guan)線、導管(guan)(guan)(guan)、容器等由熱(re)(re)(re)脹冷縮等原因而(er)產生的(de)(de)尺寸變(bian)(bian)化，或補(bu)償管(guan)(guan)(guan)線、導管(guan)(guan)(guan)、容器等的(de)(de)軸向(xiang)、橫(heng)向(xiang)和(he)角向(xiang)位(wei)移。也可用(yong)于降噪減振。在(zai)現代工(gong)(gong)(gong)業中(zhong)用(yong)途(tu)廣泛(fan)。供熱(re)(re)(re)上，為了防止供熱(re)(re)(re)管(guan)(guan)(guan)道升溫時，由于熱(re)(re)(re)伸(shen)(shen)長或溫度應力而(er)引(yin)起管(guan)(guan)(guan)道變(bian)(bian)形(xing)或破壞(huai)，需要在(zai)管(guan)(guan)(guan)道上設置補(bu)償器，以補(bu)償管(guan)(guan)(guan)道的(de)(de)熱(re)(re)(re)伸(shen)(shen)長，從而(er)減小管(guan)(guan)(guan)壁的(de)(de)應力和(he)作(zuo)(zuo)用(yong)在(zai)閥件(jian)或支架(jia)結構(gou)上的(de)(de)作(zuo)(zuo)用(yong)力。