膨(peng)(peng)脹(zhang)節習慣上(shang)(shang)也叫補(bu)償器(qi)，或伸(shen)縮(suo)(suo)節。由構成其(qi)工(gong)作(zuo)主體(ti)的(de)(de)(de)波(bo)紋(wen)管(guan)(guan)(guan)(guan)(一種彈性(xing)元件(jian))和端管(guan)(guan)(guan)(guan)、支架、法蘭、導(dao)管(guan)(guan)(guan)(guan)等附件(jian)組成。 膨(peng)(peng)脹(zhang)節是(shi)為了補(bu)償因(yin)溫(wen)度(du)差與機械(xie)振動引(yin)起的(de)(de)(de)附加應(ying)力，而設置(zhi)在容(rong)器(qi)殼體(ti)或管(guan)(guan)(guan)(guan)道上(shang)(shang)的(de)(de)(de)一種撓性(xing)結構。利用(yong)其(qi)工(gong)作(zuo)主體(ti)波(bo)紋(wen)管(guan)(guan)(guan)(guan)的(de)(de)(de)有效(xiao)伸(shen)縮(suo)(suo)變(bian)形，以吸收管(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)、容(rong)器(qi)等由熱(re)(re)脹(zhang)冷縮(suo)(suo)等原因(yin)而產(chan)生的(de)(de)(de)尺(chi)寸變(bian)化，或補(bu)償管(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)、容(rong)器(qi)等的(de)(de)(de)軸向(xiang)、橫向(xiang)和角向(xiang)位移(yi)。也可用(yong)于(yu)降噪(zao)減(jian)振。供(gong)熱(re)(re)上(shang)(shang)，為了防止(zhi)供(gong)熱(re)(re)管(guan)(guan)(guan)(guan)道升溫(wen)時，由于(yu)熱(re)(re)伸(shen)長(chang)(chang)或溫(wen)度(du)應(ying)力而引(yin)起管(guan)(guan)(guan)(guan)道變(bian)形或破壞，需要在管(guan)(guan)(guan)(guan)道上(shang)(shang)設置(zhi)補(bu)償器(qi)，以補(bu)償管(guan)(guan)(guan)(guan)道的(de)(de)(de)熱(re)(re)伸(shen)長(chang)(chang)，從而減(jian)小管(guan)(guan)(guan)(guan)壁(bi)的(de)(de)(de)應(ying)力和作(zuo)用(yong)在閥件(jian)或支架結構上(shang)(shang)的(de)(de)(de)作(zuo)用(yong)力。