膨(peng)脹(zhang)節習(xi)慣(guan)上也叫補(bu)償(chang)器(qi)(qi)，或(huo)(huo)伸(shen)縮節。由構(gou)(gou)成其工(gong)作主體的(de)波(bo)紋管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(一種彈性元(yuan)件(jian))和(he)端(duan)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、支架(jia)、法蘭(lan)、導管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)等(deng)附件(jian)組成。 膨(peng)脹(zhang)節是(shi)為了補(bu)償(chang)因溫度差與機(ji)械(xie)振(zhen)動(dong)引起(qi)的(de)附加應(ying)力(li)，而(er)設置在容器(qi)(qi)殼體或(huo)(huo)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)上的(de)一種撓性結構(gou)(gou)。利用(yong)其工(gong)作主體波(bo)紋管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)有效伸(shen)縮變(bian)形，以吸收管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、容器(qi)(qi)等(deng)由熱脹(zhang)冷縮等(deng)原因而(er)產生的(de)尺寸變(bian)化，或(huo)(huo)補(bu)償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、容器(qi)(qi)等(deng)的(de)軸向、橫向和(he)角向位(wei)移(yi)。也可用(yong)于降噪減(jian)振(zhen)。供熱上，為了防止供熱管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)升溫時，由于熱伸(shen)長或(huo)(huo)溫度應(ying)力(li)而(er)引起(qi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)變(bian)形或(huo)(huo)破(po)壞(huai)，需要在管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)上設置補(bu)償(chang)器(qi)(qi)，以補(bu)償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)的(de)熱伸(shen)長，從而(er)減(jian)小管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)壁的(de)應(ying)力(li)和(he)作用(yong)在閥件(jian)或(huo)(huo)支架(jia)結構(gou)(gou)上的(de)作用(yong)力(li)。