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角式氨用(yong)(yong)截(jie)止閥(fa)使(shi)(shi)用(yong)(yong)時通過氨用(yong)(yong)截(jie)止閥(fa)使(shi)(shi)氣體壓力降至實驗所需范(fan)圍，再(zai)經過其它控(kong)制閥(fa)門細調，使(shi)(shi)氣體輸入使(shi)(shi)用(yong)(yong)系統(tong)。較常用(yong)(yong)的減壓閥(fa)為(wei)氨用(yong)(yong)截(jie)止閥(fa)，簡稱氨用(yong)(yong)閥(fa)。