Relief valves (as a type of valve) are used to do what?

Relief valves (as a type of valve) are used to do what?

• A. They are preset to relieve pressure.
• B. They are used to prevent oil from heating.
• C. They are installed in the bypass path.
• D. They filter the oil.

Answer: (C)

Relief valves are meant to protect a hydraulic system by opening and allowing fluid to bypass the high-pressure side when the pressure reaches a set limit. Placing them in the bypass path lets the excess fluid flow back to the reservoir or low-pressure side, keeping system pressure from rising to damaging levels. The valve is set to a specific pressure so it opens at that point and closes when pressure drops again. This bypass routing is the defining behavior of a relief valve, rather than cooling the oil or filtering it, which are handled by other components.

Relief valves are meant to protect a hydraulic system by opening and allowing fluid to bypass the high-pressure side when the pressure reaches a set limit. Placing them in the bypass path lets the excess fluid flow back to the reservoir or low-pressure side, keeping system pressure from rising to damaging levels. The valve is set to a specific pressure so it opens at that point and closes when pressure drops again. This bypass routing is the defining behavior of a relief valve, rather than cooling the oil or filtering it, which are handled by other components.