膨(peng)(peng)脹(zhang)節(jie)習慣上(shang)(shang)也(ye)(ye)叫補(bu)(bu)(bu)償器，或(huo)伸(shen)縮節(jie)。由(you)構成其(qi)工作主(zhu)體的(de)(de)波紋管(guan)(guan)(guan)(一(yi)種(zhong)彈性元件(jian))和(he)端(duan)管(guan)(guan)(guan)、支(zhi)架、法蘭、導管(guan)(guan)(guan)等(deng)附件(jian)組成。 膨(peng)(peng)脹(zhang)節(jie)是為(wei)了補(bu)(bu)(bu)償因溫(wen)度差與機械振(zhen)動引起(qi)的(de)(de)附加應(ying)力，而(er)設置在(zai)容(rong)器殼體或(huo)管(guan)(guan)(guan)道上(shang)(shang)的(de)(de)一(yi)種(zhong)撓性結(jie)(jie)構。利用(yong)其(qi)工作主(zhu)體波紋管(guan)(guan)(guan)的(de)(de)有效伸(shen)縮變形(xing)，以吸收管(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)、容(rong)器等(deng)由(you)熱(re)脹(zhang)冷縮等(deng)原(yuan)因而(er)產生(sheng)的(de)(de)尺寸變化，或(huo)補(bu)(bu)(bu)償管(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)、容(rong)器等(deng)的(de)(de)軸向、橫向和(he)角向位移。也(ye)(ye)可(ke)用(yong)于降噪(zao)減(jian)振(zhen)。供(gong)熱(re)上(shang)(shang)，為(wei)了防止供(gong)熱(re)管(guan)(guan)(guan)道升溫(wen)時，由(you)于熱(re)伸(shen)長或(huo)溫(wen)度應(ying)力而(er)引起(qi)管(guan)(guan)(guan)道變形(xing)或(huo)破壞，需要(yao)在(zai)管(guan)(guan)(guan)道上(shang)(shang)設置補(bu)(bu)(bu)償器，以補(bu)(bu)(bu)償管(guan)(guan)(guan)道的(de)(de)熱(re)伸(shen)長，從而(er)減(jian)小管(guan)(guan)(guan)壁的(de)(de)應(ying)力和(he)作用(yong)在(zai)閥件(jian)或(huo)支(zhi)架結(jie)(jie)構上(shang)(shang)的(de)(de)作用(yong)力。