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不銹鋼氨(an)(an)用(yong)截止(zhi)(zhi)(zhi)閥(fa)(fa)使(shi)用(yong)時(shi)通過b銹鋼氨(an)(an)用(yong)截止(zhi)(zhi)(zhi)閥(fa)(fa)使(shi)氣體壓(ya)力降至(zhi)實驗所需范圍，再經過其它控(kong)制(zhi)閥(fa)(fa)門細調，使(shi)氣體輸入使(shi)用(yong)系(xi)統。較常用(yong)的減(jian)壓(ya)閥(fa)(fa)為b銹鋼氨(an)(an)用(yong)截止(zhi)(zhi)(zhi)閥(fa)(fa)，簡(jian)稱氨(an)(an)用(yong)閥(fa)(fa)。