膨(peng)脹節習慣上也叫補償(chang)(chang)器，或(huo)(huo)(huo)伸(shen)縮節。由(you)構(gou)成其工(gong)作(zuo)(zuo)主(zhu)體的波紋管(guan)(guan)(guan)(guan)(guan)(guan)(一種彈性元件)和(he)端管(guan)(guan)(guan)(guan)(guan)(guan)、支架、法蘭(lan)、導(dao)管(guan)(guan)(guan)(guan)(guan)(guan)等(deng)附件組(zu)成。 膨(peng)脹節是為(wei)了(le)補償(chang)(chang)因(yin)溫(wen)(wen)度差與機械振動引起(qi)的附加應(ying)力(li)(li)，而(er)(er)(er)設置在(zai)容(rong)器殼(ke)體或(huo)(huo)(huo)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)(dao)上的一種撓(nao)性結構(gou)。利(li)用(yong)(yong)其工(gong)作(zuo)(zuo)主(zhu)體波紋管(guan)(guan)(guan)(guan)(guan)(guan)的有效伸(shen)縮變形，以吸收管(guan)(guan)(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)(guan)(guan)、容(rong)器等(deng)由(you)熱(re)脹冷縮等(deng)原因(yin)而(er)(er)(er)產生的尺(chi)寸變化，或(huo)(huo)(huo)補償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)(guan)(guan)、容(rong)器等(deng)的軸(zhou)向、橫向和(he)角向位移(yi)。也可用(yong)(yong)于降噪減(jian)振。供熱(re)上，為(wei)了(le)防止(zhi)供熱(re)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)(dao)升(sheng)溫(wen)(wen)時，由(you)于熱(re)伸(shen)長(chang)或(huo)(huo)(huo)溫(wen)(wen)度應(ying)力(li)(li)而(er)(er)(er)引起(qi)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)(dao)變形或(huo)(huo)(huo)破(po)壞(huai)，需要在(zai)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)(dao)上設置補償(chang)(chang)器，以補償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)(dao)的熱(re)伸(shen)長(chang)，從(cong)而(er)(er)(er)減(jian)小管(guan)(guan)(guan)(guan)(guan)(guan)壁的應(ying)力(li)(li)和(he)作(zuo)(zuo)用(yong)(yong)在(zai)閥件或(huo)(huo)(huo)支架結構(gou)上的作(zuo)(zuo)用(yong)(yong)力(li)(li)。