補償(chang)(chang)器習(xi)慣上也(ye)叫膨脹(zhang)(zhang)節，或伸縮(suo)節。由(you)(you)構(gou)成(cheng)其工作(zuo)主體(ti)(ti)的波(bo)紋管(guan)(guan)(guan)(guan)(guan)(guan)(guan)（一(yi)種彈性元(yuan)件）和端管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、支架、法蘭(lan)、導管(guan)(guan)(guan)(guan)(guan)(guan)(guan)等(deng)(deng)附件組成(cheng)。 屬于(yu)一(yi)種補償(chang)(chang)元(yuan)件。利用(yong)其工作(zuo)主體(ti)(ti)波(bo)紋管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的有效伸縮(suo)變(bian)形，以吸(xi)收管(guan)(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、容器等(deng)(deng)由(you)(you)熱(re)(re)(re)脹(zhang)(zhang)冷(leng)縮(suo)等(deng)(deng)原因而產生的尺寸變(bian)化，或補償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、容器等(deng)(deng)的軸向、橫(heng)向和角向位(wei)移。也(ye)可用(yong)于(yu)降噪減振。在(zai)現代工業中用(yong)途廣(guang)泛。供(gong)熱(re)(re)(re)上，為了(le)防(fang)止供(gong)熱(re)(re)(re)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道升溫時，由(you)(you)于(yu)熱(re)(re)(re)伸長或溫度(du)應力(li)而引起管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道變(bian)形或破(po)壞，需要在(zai)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道上設置(zhi)補償(chang)(chang)器，以補償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道的熱(re)(re)(re)伸長，從而減小管(guan)(guan)(guan)(guan)(guan)(guan)(guan)壁的應力(li)和作(zuo)用(yong)在(zai)閥(fa)件或支架結構(gou)上的作(zuo)用(yong)力(li)。