Valves with this option have a hand wheel mounted on top of the actuator for manual valve operation.
配置这种备选件的阀门在执行器顶部安装一个手轮用于手动阀门操作。
Front-wheel system was changed from the manual tension V-belt to automatic tension V-ribbed belts , more smoother operation and higher reliability.
前端轮系从手动张紧的三角带传动改为自动张紧的多楔带传动,运转更平稳,可靠性高。
Manual molding had been used for the nodular iron front wheel boss and differential mechanism case, and chills were used to prevent shrinkage defects.
球铁前轮毂和差速器原采用手工造型,用外冷铁解决缩孔缺陷。
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