膨脹(zhang)節習(xi)慣上(shang)(shang)也(ye)叫補償器(qi)(qi)，或伸(shen)(shen)縮節。由(you)構成其(qi)工作主(zhu)體(ti)的波紋(wen)管(guan)(guan)(guan)(一種彈性元件)和端(duan)管(guan)(guan)(guan)、支架、法蘭、導管(guan)(guan)(guan)等(deng)附(fu)件組成。 膨脹(zhang)節是為(wei)了(le)補償因溫(wen)度(du)差與(yu)機械振(zhen)動引起的附(fu)加應(ying)(ying)力，而(er)設置在(zai)容(rong)器(qi)(qi)殼體(ti)或管(guan)(guan)(guan)道(dao)上(shang)(shang)的一種撓性結(jie)構。利用(yong)(yong)其(qi)工作主(zhu)體(ti)波紋(wen)管(guan)(guan)(guan)的有(you)效伸(shen)(shen)縮變(bian)形，以吸收管(guan)(guan)(guan)線、導管(guan)(guan)(guan)、容(rong)器(qi)(qi)等(deng)由(you)熱(re)脹(zhang)冷縮等(deng)原因而(er)產(chan)生的尺(chi)寸變(bian)化，或補償管(guan)(guan)(guan)線、導管(guan)(guan)(guan)、容(rong)器(qi)(qi)等(deng)的軸向、橫向和角(jiao)向位移。也(ye)可用(yong)(yong)于降噪減振(zhen)。供熱(re)上(shang)(shang)，為(wei)了(le)防止(zhi)供熱(re)管(guan)(guan)(guan)道(dao)升溫(wen)時(shi)，由(you)于熱(re)伸(shen)(shen)長(chang)或溫(wen)度(du)應(ying)(ying)力而(er)引起管(guan)(guan)(guan)道(dao)變(bian)形或破(po)壞，需要在(zai)管(guan)(guan)(guan)道(dao)上(shang)(shang)設置補償器(qi)(qi)，以補償管(guan)(guan)(guan)道(dao)的熱(re)伸(shen)(shen)長(chang)，從(cong)而(er)減小(xiao)管(guan)(guan)(guan)壁(bi)的應(ying)(ying)力和作用(yong)(yong)在(zai)閥件或支架結(jie)構上(shang)(shang)的作用(yong)(yong)力。