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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。圖(tu)2為常見的軸向(xiang)式波(bo)紋管(guan)(guan)(guan)(guan)膨脹(zhang)節,用(yong)在(zai)(zai)管(guan)(guan)(guan)(guan)道(dao)上進行軸向(xiang)長度補償。為了防止超過允許的補償量,在(zai)(zai)波(bo)紋管(guan)(guan)(guan)(guan)兩(liang)端(duan)設置(zhi)有(you)保護拉桿或保護環,在(zai)(zai)與它連接的兩(liang)端(duan)管(guan)(guan)(guan)(guan)道(dao)上設置(zhi)導向(xiang)支架。另外還有(you)轉角式和(he)(he)橫向(xiang)式膨脹(zhang)節,可(ke)(ke)用(yong)來補償管(guan)(guan)(guan)(guan)道(dao)的轉角變形(xing)(xing)和(he)(he)橫向(xiang)變形(xing)(xing)。這類(lei)膨脹(zhang)節的優點是(shi)(shi)節省空間,節約材料,便于標準化(hua)和(he)(he)批量生產,缺(que)點是(shi)(shi)壽命較(jiao)(jiao)短。波(bo)紋管(guan)(guan)(guan)(guan)膨脹(zhang)節一(yi)般用(yong)于溫度和(he)(he)壓力不很高、長度較(jiao)(jiao)短的管(guan)(guan)(guan)(guan)道(dao)上。隨著波(bo)紋管(guan)(guan)(guan)(guan)生產技術水平的提高,這類(lei)膨脹(zhang)節的應用(yong)范圍(wei)正在(zai)(zai)擴(kuo)大(da)。目(mu)前,波(bo)紋管(guan)(guan)(guan)(guan)膨脹(zhang)節可(ke)(ke)用(yong)在(zai)(zai)最高壓力6.0兆(zhao)帕的管(guan)(guan)(guan)(guan)系中。