Ace the Elevator Mechanic Exam 2025 – Rise to the Challenge and Elevate Your Career!

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Question: 1 / 400

During valve operations, which valve controls the oil flow in only one direction?

Bypass valve

Check valve

The correct answer is the check valve. This type of valve is specifically designed to allow fluid (in this case, oil) to flow in one direction only. It typically consists of a movable element that opens when fluid flows in the preferred direction, but closes to prevent backflow when the fluid tries to return.

By contrast, the bypass valve is used to redirect fluid away from certain areas and does not restrict flow direction in the same way. The down valve and up valve refer to directional control within an elevator system, allowing movement in their respective directions, but they do not function specifically to prevent backward flow like a check valve does. Therefore, in the context of controlling the direction of oil flow, the check valve is the appropriate choice.

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Down valve

Up valve

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