補(bu)償(chang)器習慣上也叫膨(peng)脹節，或伸縮(suo)節。由(you)構(gou)(gou)成其(qi)工(gong)(gong)作(zuo)(zuo)主體的波紋管(guan)(guan)（一(yi)(yi)種彈性(xing)元件(jian)）和(he)端管(guan)(guan)、支(zhi)架、法蘭、導管(guan)(guan)等(deng)(deng)附件(jian)組(zu)成。 屬于一(yi)(yi)種補(bu)償(chang)元件(jian)。利(li)用(yong)其(qi)工(gong)(gong)作(zuo)(zuo)主體波紋管(guan)(guan)的有效伸縮(suo)變(bian)(bian)形(xing)，以吸收管(guan)(guan)線(xian)、導管(guan)(guan)、容器等(deng)(deng)由(you)熱脹冷縮(suo)等(deng)(deng)原因而產生的尺寸變(bian)(bian)化，或補(bu)償(chang)管(guan)(guan)線(xian)、導管(guan)(guan)、容器等(deng)(deng)的軸向(xiang)、橫向(xiang)和(he)角向(xiang)位移。也可用(yong)于降(jiang)噪減振。在現代工(gong)(gong)業中(zhong)用(yong)途廣(guang)泛。供(gong)熱上，為了防止供(gong)熱管(guan)(guan)道(dao)(dao)升溫時，由(you)于熱伸長或溫度(du)應力而引(yin)起管(guan)(guan)道(dao)(dao)變(bian)(bian)形(xing)或破壞(huai)，需(xu)要在管(guan)(guan)道(dao)(dao)上設(she)置補(bu)償(chang)器，以補(bu)償(chang)管(guan)(guan)道(dao)(dao)的熱伸長，從而減小(xiao)管(guan)(guan)壁的應力和(he)作(zuo)(zuo)用(yong)在閥件(jian)或支(zhi)架結構(gou)(gou)上的作(zuo)(zuo)用(yong)力。