膨(peng)脹節習(xi)慣上(shang)也叫(jiao)補償(chang)器，或(huo)(huo)伸(shen)縮節。由構(gou)成其工作(zuo)主(zhu)體的(de)(de)波(bo)紋管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(一種(zhong)彈性元(yuan)件)和端管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、支架、法蘭、導管(guan)(guan)(guan)(guan)(guan)(guan)(guan)等附件組成。 膨(peng)脹節是(shi)為(wei)了(le)補償(chang)因溫度差與機械振動(dong)引起的(de)(de)附加應(ying)力，而設(she)置在(zai)容器殼體或(huo)(huo)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)的(de)(de)一種(zhong)撓(nao)性結構(gou)。利用(yong)其工作(zuo)主(zhu)體波(bo)紋管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)有效伸(shen)縮變(bian)形，以(yi)吸收管(guan)(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、容器等由熱脹冷縮等原因而產生的(de)(de)尺寸(cun)變(bian)化，或(huo)(huo)補償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、容器等的(de)(de)軸向、橫向和角(jiao)向位移(yi)。也可用(yong)于降(jiang)噪減(jian)振。供熱上(shang)，為(wei)了(le)防止供熱管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)升溫時，由于熱伸(shen)長(chang)或(huo)(huo)溫度應(ying)力而引起管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)變(bian)形或(huo)(huo)破壞(huai)，需(xu)要在(zai)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)設(she)置補償(chang)器，以(yi)補償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)的(de)(de)熱伸(shen)長(chang)，從(cong)而減(jian)小管(guan)(guan)(guan)(guan)(guan)(guan)(guan)壁的(de)(de)應(ying)力和作(zuo)用(yong)在(zai)閥件或(huo)(huo)支架結構(gou)上(shang)的(de)(de)作(zuo)用(yong)力。