膨(peng)(peng)脹節(jie)習慣上(shang)也叫補償(chang)器(qi)(qi)，或(huo)伸縮節(jie)。由構(gou)成(cheng)其(qi)工(gong)作(zuo)主體(ti)的波紋管(guan)(guan)(guan)(guan)(一種彈性元(yuan)件(jian)(jian))和(he)端管(guan)(guan)(guan)(guan)、支架、法蘭、導管(guan)(guan)(guan)(guan)等(deng)附件(jian)(jian)組成(cheng)。 膨(peng)(peng)脹節(jie)是為了補償(chang)因溫(wen)度差與機械振(zhen)動(dong)引起的附加(jia)應(ying)(ying)力，而設置(zhi)在(zai)容器(qi)(qi)殼體(ti)或(huo)管(guan)(guan)(guan)(guan)道(dao)上(shang)的一種撓性結構(gou)。利用其(qi)工(gong)作(zuo)主體(ti)波紋管(guan)(guan)(guan)(guan)的有效(xiao)伸縮變形(xing)，以(yi)吸收管(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)、容器(qi)(qi)等(deng)由熱脹冷縮等(deng)原因而產生的尺(chi)寸變化，或(huo)補償(chang)管(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)、容器(qi)(qi)等(deng)的軸(zhou)向(xiang)、橫向(xiang)和(he)角(jiao)向(xiang)位移。也可用于降噪減(jian)(jian)振(zhen)。供(gong)熱上(shang)，為了防止(zhi)供(gong)熱管(guan)(guan)(guan)(guan)道(dao)升溫(wen)時，由于熱伸長或(huo)溫(wen)度應(ying)(ying)力而引起管(guan)(guan)(guan)(guan)道(dao)變形(xing)或(huo)破壞，需要在(zai)管(guan)(guan)(guan)(guan)道(dao)上(shang)設置(zhi)補償(chang)器(qi)(qi)，以(yi)補償(chang)管(guan)(guan)(guan)(guan)道(dao)的熱伸長，從(cong)而減(jian)(jian)小管(guan)(guan)(guan)(guan)壁的應(ying)(ying)力和(he)作(zuo)用在(zai)閥件(jian)(jian)或(huo)支架結構(gou)上(shang)的作(zuo)用力。