補(bu)償(chang)器習慣上(shang)也叫膨(peng)脹節，或(huo)伸(shen)(shen)縮(suo)節。由構(gou)成(cheng)其工(gong)作(zuo)主體的(de)(de)波(bo)(bo)紋管(guan)(guan)(guan)(guan)（一(yi)(yi)種(zhong)彈性(xing)元件(jian)）和(he)端管(guan)(guan)(guan)(guan)、支架、法(fa)蘭、導管(guan)(guan)(guan)(guan)等(deng)(deng)附件(jian)組成(cheng)。 屬于(yu)一(yi)(yi)種(zhong)補(bu)償(chang)元件(jian)。利用(yong)其工(gong)作(zuo)主體波(bo)(bo)紋管(guan)(guan)(guan)(guan)的(de)(de)有效伸(shen)(shen)縮(suo)變(bian)形，以(yi)吸收(shou)管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容器等(deng)(deng)由熱(re)脹冷縮(suo)等(deng)(deng)原因而產生的(de)(de)尺寸變(bian)化(hua)，或(huo)補(bu)償(chang)管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容器等(deng)(deng)的(de)(de)軸向、橫向和(he)角(jiao)向位移。也可用(yong)于(yu)降噪減(jian)振。在現代工(gong)業中用(yong)途(tu)廣(guang)泛(fan)。供(gong)熱(re)上(shang)，為了防止供(gong)熱(re)管(guan)(guan)(guan)(guan)道(dao)升溫時，由于(yu)熱(re)伸(shen)(shen)長或(huo)溫度應力(li)而引起管(guan)(guan)(guan)(guan)道(dao)變(bian)形或(huo)破壞，需要(yao)在管(guan)(guan)(guan)(guan)道(dao)上(shang)設(she)置補(bu)償(chang)器，以(yi)補(bu)償(chang)管(guan)(guan)(guan)(guan)道(dao)的(de)(de)熱(re)伸(shen)(shen)長，從而減(jian)小管(guan)(guan)(guan)(guan)壁的(de)(de)應力(li)和(he)作(zuo)用(yong)在閥件(jian)或(huo)支架結構(gou)上(shang)的(de)(de)作(zuo)用(yong)力(li)。