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波紋管膨脹節是用金屬波紋管制成的一種膨脹節。它能沿管道軸線方向伸縮,也允許少量彎曲(qu)。圖(tu)2為常見的軸向(xiang)式(shi)波紋(wen)(wen)(wen)管(guan)(guan)(guan)膨(peng)脹節(jie)(jie),用(yong)在(zai)管(guan)(guan)(guan)道(dao)(dao)上(shang)(shang)進行軸向(xiang)長度(du)補償(chang)。為了(le)防止超(chao)過允許的補償(chang)量,在(zai)波紋(wen)(wen)(wen)管(guan)(guan)(guan)兩(liang)端(duan)設(she)(she)置有(you)保(bao)(bao)護拉桿或(huo)保(bao)(bao)護環(huan),在(zai)與它連(lian)接的兩(liang)端(duan)管(guan)(guan)(guan)道(dao)(dao)上(shang)(shang)設(she)(she)置導向(xiang)支(zhi)架。另外還有(you)轉角式(shi)和(he)橫向(xiang)式(shi)膨(peng)脹節(jie)(jie),可用(yong)來(lai)補償(chang)管(guan)(guan)(guan)道(dao)(dao)的轉角變(bian)形(xing)和(he)橫向(xiang)變(bian)形(xing)。這類膨(peng)脹節(jie)(jie)的優(you)點是節(jie)(jie)省空間,節(jie)(jie)約(yue)材(cai)料,便于(yu)標準(zhun)化和(he)批量生產,缺點是壽命較短(duan)。波紋(wen)(wen)(wen)管(guan)(guan)(guan)膨(peng)脹節(jie)(jie)一般用(yong)于(yu)溫度(du)和(he)壓力不(bu)很(hen)高、長度(du)較短(duan)的管(guan)(guan)(guan)道(dao)(dao)上(shang)(shang)。隨著波紋(wen)(wen)(wen)管(guan)(guan)(guan)生產技(ji)術水平(ping)的提高,這類膨(peng)脹節(jie)(jie)的應用(yong)范圍正在(zai)擴大。目前,波紋(wen)(wen)(wen)管(guan)(guan)(guan)膨(peng)脹節(jie)(jie)可用(yong)在(zai)最高壓力6.0兆(zhao)帕的管(guan)(guan)(guan)系中。