膨(peng)脹節習慣上也(ye)叫補(bu)(bu)償器，或(huo)伸(shen)縮(suo)節。由(you)(you)構(gou)成(cheng)其工作(zuo)主(zhu)(zhu)體(ti)的(de)波(bo)紋管(guan)(guan)(guan)(guan)(一(yi)種彈(dan)性(xing)元(yuan)件(jian)(jian))和(he)端管(guan)(guan)(guan)(guan)、支(zhi)架、法蘭、導(dao)管(guan)(guan)(guan)(guan)等附(fu)件(jian)(jian)組成(cheng)。 膨(peng)脹節是為了(le)補(bu)(bu)償因溫(wen)度差與機械振動(dong)引(yin)起的(de)附(fu)加應(ying)力(li)，而設置(zhi)(zhi)在容(rong)器殼體(ti)或(huo)管(guan)(guan)(guan)(guan)道上的(de)一(yi)種撓性(xing)結構(gou)。利(li)用(yong)(yong)其工作(zuo)主(zhu)(zhu)體(ti)波(bo)紋管(guan)(guan)(guan)(guan)的(de)有效伸(shen)縮(suo)變形(xing)，以吸收(shou)管(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)、容(rong)器等由(you)(you)熱(re)(re)脹冷(leng)縮(suo)等原因而產生的(de)尺寸變化，或(huo)補(bu)(bu)償管(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)、容(rong)器等的(de)軸向(xiang)、橫向(xiang)和(he)角向(xiang)位移。也(ye)可(ke)用(yong)(yong)于降噪減振。供熱(re)(re)上，為了(le)防止供熱(re)(re)管(guan)(guan)(guan)(guan)道升溫(wen)時(shi)，由(you)(you)于熱(re)(re)伸(shen)長或(huo)溫(wen)度應(ying)力(li)而引(yin)起管(guan)(guan)(guan)(guan)道變形(xing)或(huo)破壞，需要在管(guan)(guan)(guan)(guan)道上設置(zhi)(zhi)補(bu)(bu)償器，以補(bu)(bu)償管(guan)(guan)(guan)(guan)道的(de)熱(re)(re)伸(shen)長，從而減小管(guan)(guan)(guan)(guan)壁的(de)應(ying)力(li)和(he)作(zuo)用(yong)(yong)在閥件(jian)(jian)或(huo)支(zhi)架結構(gou)上的(de)作(zuo)用(yong)(yong)力(li)。