Specification for electrically operated automatic gas shut - off valves fitted with throughput adjusters , proof of closure switches , closed position indicator switches or gas flow control 裝有流量調(diào)節(jié)器閉路開關(guān)檢驗(yàn)閉合位置指示開關(guān)或氣流量控制器電動(dòng)式氣體自動(dòng)關(guān)閉閥規(guī)范