膨(peng)脹節(jie)習(xi)慣(guan)上(shang)(shang)(shang)也叫(jiao)補(bu)(bu)償器(qi)(qi)，或(huo)(huo)伸(shen)(shen)縮節(jie)。由構成(cheng)其(qi)工(gong)(gong)作主(zhu)體的(de)(de)波(bo)紋管(guan)(guan)(guan)(guan)(guan)(一種(zhong)彈(dan)性(xing)元(yuan)件(jian))和(he)端(duan)管(guan)(guan)(guan)(guan)(guan)、支(zhi)架(jia)、法(fa)蘭、導(dao)(dao)管(guan)(guan)(guan)(guan)(guan)等附件(jian)組(zu)成(cheng)。 膨(peng)脹節(jie)是為(wei)了補(bu)(bu)償因溫(wen)度(du)差(cha)與(yu)機(ji)械振(zhen)動引(yin)起(qi)的(de)(de)附加(jia)應(ying)力(li)，而(er)設置(zhi)在容器(qi)(qi)殼體或(huo)(huo)管(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)(shang)(shang)的(de)(de)一種(zhong)撓性(xing)結構。利(li)用(yong)其(qi)工(gong)(gong)作主(zhu)體波(bo)紋管(guan)(guan)(guan)(guan)(guan)的(de)(de)有(you)效(xiao)伸(shen)(shen)縮變形，以吸收管(guan)(guan)(guan)(guan)(guan)線、導(dao)(dao)管(guan)(guan)(guan)(guan)(guan)、容器(qi)(qi)等由熱(re)(re)脹冷縮等原因而(er)產(chan)生的(de)(de)尺寸變化，或(huo)(huo)補(bu)(bu)償管(guan)(guan)(guan)(guan)(guan)線、導(dao)(dao)管(guan)(guan)(guan)(guan)(guan)、容器(qi)(qi)等的(de)(de)軸向(xiang)、橫向(xiang)和(he)角(jiao)向(xiang)位(wei)移。也可用(yong)于(yu)降噪(zao)減(jian)振(zhen)。供熱(re)(re)上(shang)(shang)(shang)，為(wei)了防止(zhi)供熱(re)(re)管(guan)(guan)(guan)(guan)(guan)道(dao)升溫(wen)時，由于(yu)熱(re)(re)伸(shen)(shen)長(chang)或(huo)(huo)溫(wen)度(du)應(ying)力(li)而(er)引(yin)起(qi)管(guan)(guan)(guan)(guan)(guan)道(dao)變形或(huo)(huo)破壞(huai)，需要(yao)在管(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)(shang)(shang)設置(zhi)補(bu)(bu)償器(qi)(qi)，以補(bu)(bu)償管(guan)(guan)(guan)(guan)(guan)道(dao)的(de)(de)熱(re)(re)伸(shen)(shen)長(chang)，從而(er)減(jian)小管(guan)(guan)(guan)(guan)(guan)壁的(de)(de)應(ying)力(li)和(he)作用(yong)在閥件(jian)或(huo)(huo)支(zhi)架(jia)結構上(shang)(shang)(shang)的(de)(de)作用(yong)力(li)。