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The open angle indicating device should display the open state of the valve gate exactly.
开度指示机构应准确地显示阀门的开启状态。
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Gate, Globe, Angle and Check Valve Figure Number System.
闸阀，截止阀，角阀和止回阀型号编制体系。
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Gate, Globe, Angle and Check Valve Figure Number System.
闸阀，截止阀，角阀和止回阀型号编制体系。
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