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2019-09-20View Original

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Reply #22019-09-20

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Reply #82019-09-24

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Reply #92019-09-24

"从外观上直行程的执行机构（globe阀）气缸顶上进气为气关阀，底下进气为气开阀，角行程执行机构（一般是蝶阀，球阀）外观看不出来。具体一台阀选气开还是气关，主要是从工艺安全性考虑，即在没有任何动力（气源、电压、电流）的情况下希望这个阀是打开还是关闭。

Reply #102019-10-31

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