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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(shao)量彎曲。圖2為常(chang)見的軸(zhou)向式(shi)(shi)波(bo)紋(wen)(wen)管(guan)(guan)(guan)(guan)(guan)膨(peng)脹節(jie)(jie),用在(zai)管(guan)(guan)(guan)(guan)(guan)道(dao)上進(jin)行軸(zhou)向長度(du)補償。為了防止超(chao)過允(yun)許的補償量,在(zai)波(bo)紋(wen)(wen)管(guan)(guan)(guan)(guan)(guan)兩端設(she)置有(you)保護拉桿或(huo)保護環,在(zai)與(yu)它連接的兩端管(guan)(guan)(guan)(guan)(guan)道(dao)上設(she)置導向支架。另外(wai)還有(you)轉角式(shi)(shi)和(he)橫(heng)向式(shi)(shi)膨(peng)脹節(jie)(jie),可用來補償管(guan)(guan)(guan)(guan)(guan)道(dao)的轉角變形(xing)(xing)和(he)橫(heng)向變形(xing)(xing)。這類(lei)膨(peng)脹節(jie)(jie)的優點是(shi)節(jie)(jie)省空間,節(jie)(jie)約材(cai)料(liao),便(bian)于(yu)標準化和(he)批(pi)量生產(chan),缺點是(shi)壽(shou)命較短。波(bo)紋(wen)(wen)管(guan)(guan)(guan)(guan)(guan)膨(peng)脹節(jie)(jie)一般用于(yu)溫(wen)度(du)和(he)壓力不(bu)很高(gao)、長度(du)較短的管(guan)(guan)(guan)(guan)(guan)道(dao)上。隨著波(bo)紋(wen)(wen)管(guan)(guan)(guan)(guan)(guan)生產(chan)技(ji)術水(shui)平的提高(gao),這類(lei)膨(peng)脹節(jie)(jie)的應用范圍正在(zai)擴大。目前,波(bo)紋(wen)(wen)管(guan)(guan)(guan)(guan)(guan)膨(peng)脹節(jie)(jie)可用在(zai)最高(gao)壓力6.0兆帕的管(guan)(guan)(guan)(guan)(guan)系(xi)中(zhong)。