How does a check valve function in a piping system?

Prepare for the Master Mechanical License Test with flashcards and multiple-choice questions. Each question includes hints and detailed explanations. Get confident for your exam!

A check valve is specifically designed to allow fluid flow in only one direction while preventing backflow, which can be crucial for maintaining the integrity of a piping system. When fluid flows in the intended direction, it opens the valve, allowing movement. If the flow reverses, the valve closes automatically, preventing the fluid from going backward. This mechanism helps in protecting equipment, preventing contamination, and maintaining system pressure.

The other options describe functions that do not align with the specific purpose of a check valve. Allowing flow in both directions contradicts its fundamental design and purpose. Preventing all flow when closed does not take into account the operational functionality of the valve during intended flow. Lastly, equalizing pressure is more characteristic of other types of valves or systems designed for pressure management, rather than the dedicated function of a check valve in controlling flow direction.

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