補(bu)(bu)償(chang)器習慣上(shang)也叫膨(peng)脹節，或(huo)伸縮(suo)節。由構(gou)成其(qi)工(gong)作(zuo)主(zhu)體(ti)的波紋管(guan)(guan)(guan)(guan)(guan)(guan)（一(yi)種彈性(xing)元件(jian)）和端管(guan)(guan)(guan)(guan)(guan)(guan)、支架、法(fa)蘭、導管(guan)(guan)(guan)(guan)(guan)(guan)等附件(jian)組成。 屬(shu)于(yu)(yu)一(yi)種補(bu)(bu)償(chang)元件(jian)。利(li)用(yong)其(qi)工(gong)作(zuo)主(zhu)體(ti)波紋管(guan)(guan)(guan)(guan)(guan)(guan)的有效伸縮(suo)變(bian)形(xing)，以(yi)吸收管(guan)(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)(guan)、容器等由熱(re)脹冷縮(suo)等原因而產生的尺(chi)寸變(bian)化，或(huo)補(bu)(bu)償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)(guan)、容器等的軸向、橫向和角向位移(yi)。也可(ke)用(yong)于(yu)(yu)降噪(zao)減振(zhen)。在現(xian)代工(gong)業中(zhong)用(yong)途(tu)廣泛。供熱(re)上(shang)，為了防止供熱(re)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)升溫(wen)(wen)時，由于(yu)(yu)熱(re)伸長(chang)(chang)或(huo)溫(wen)(wen)度應力而引起管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)變(bian)形(xing)或(huo)破壞，需要在管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)設(she)置補(bu)(bu)償(chang)器，以(yi)補(bu)(bu)償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)的熱(re)伸長(chang)(chang)，從(cong)而減小管(guan)(guan)(guan)(guan)(guan)(guan)壁(bi)的應力和作(zuo)用(yong)在閥件(jian)或(huo)支架結(jie)構(gou)上(shang)的作(zuo)用(yong)力。