補償(chang)(chang)器習(xi)慣上也叫(jiao)膨脹節，或(huo)(huo)伸(shen)縮節。由構(gou)成其(qi)工(gong)(gong)作主體的波(bo)紋(wen)管(guan)(guan)(guan)(guan)（一種彈性元(yuan)件）和(he)端管(guan)(guan)(guan)(guan)、支(zhi)架(jia)、法蘭、導管(guan)(guan)(guan)(guan)等附件組成。 屬于(yu)一種補償(chang)(chang)元(yuan)件。利用其(qi)工(gong)(gong)作主體波(bo)紋(wen)管(guan)(guan)(guan)(guan)的有效伸(shen)縮變形(xing)，以吸(xi)收管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容器等由熱(re)(re)脹冷縮等原因而產生的尺寸變化，或(huo)(huo)補償(chang)(chang)管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容器等的軸向、橫向和(he)角向位移。也可用于(yu)降噪減(jian)振(zhen)。在現(xian)代工(gong)(gong)業中(zhong)用途廣泛。供熱(re)(re)上，為了防止供熱(re)(re)管(guan)(guan)(guan)(guan)道升溫(wen)時，由于(yu)熱(re)(re)伸(shen)長或(huo)(huo)溫(wen)度(du)應力(li)而引起管(guan)(guan)(guan)(guan)道變形(xing)或(huo)(huo)破(po)壞，需要在管(guan)(guan)(guan)(guan)道上設置補償(chang)(chang)器，以補償(chang)(chang)管(guan)(guan)(guan)(guan)道的熱(re)(re)伸(shen)長，從而減(jian)小管(guan)(guan)(guan)(guan)壁的應力(li)和(he)作用在閥件或(huo)(huo)支(zhi)架(jia)結構(gou)上的作用力(li)。