BS 7461-1991 带有流量调节器、闭路开关指示、闭合位置指示器开关或气流量控制的电动自动气动截止阀规范
BS 7461-1991 带有流量调节器、闭路开关指示、闭合位置指示器开关或气流量控制的电动自动气动截止阀规范Specification for electrically operated automatic gas shut-off valves fitted with throughput adjusters, proof of closure switches.rar
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