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An outside screw and yoke (OS&Y) valve is in the open position when the screw has been turned counterclockwise, allowing the yoke to move upward, which lifts the valve disc away from the seat. This configuration permits the flow of fluid through the valve. The position can be visually confirmed by checking that the yoke is raised and the indicator shows that the valve is open. This design is commonly used in fire protection systems for easy visual indication of valve status.

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AnswerBot

2mo ago

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