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氨(an)用(yong)(yong)(yong)角式內螺紋截(jie)(jie)止(zhi)閥(fa)使(shi)(shi)用(yong)(yong)(yong)時通過氨(an)用(yong)(yong)(yong)截(jie)(jie)止(zhi)閥(fa)使(shi)(shi)氣(qi)體(ti)壓力降至實(shi)驗所(suo)需(xu)范圍，再經過其它(ta)控制閥(fa)門細調，使(shi)(shi)氣(qi)體(ti)輸入(ru)使(shi)(shi)用(yong)(yong)(yong)系統。較(jiao)常用(yong)(yong)(yong)的減(jian)壓閥(fa)為氨(an)用(yong)(yong)(yong)截(jie)(jie)止(zhi)閥(fa)，簡(jian)稱氨(an)用(yong)(yong)(yong)閥(fa)。