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OS&Y Wedge Flanged Gate Valve Cast Iron - Z41T OS&Y wedge flanged gate valve is widely used in petroleum, chemical, pharmaceutical, electric power and other industries. Z41T/W in the nominal pressure ≤ 1.0MPa steam, water, oil media for opening and closing the pipeline. A+Z41T/W in the nominal pressure ≤ 1.6MPa steam, water, oil media for opening and closing the pipeline.