Relief valves are preset to relieve pressure.

Relief valves are preset to relieve pressure.

• A. Relieve pressure.
• B. Increase pressure.
• C. Filter oil.
• D. Change oil color.

Answer: (A)

Relief valves are safety devices in hydraulic and pneumatic systems that are calibrated to open at a specific preset pressure. When system pressure reaches that set value, the valve opens to bypass or discharge the fluid, relieving the excess pressure and protecting components from overpressure damage. Once the pressure drops below the reseating point, the valve closes again, ready to act at the next overpressure event. This function is all about preventing pressure from rising too high, not increasing it, filtering oil, or changing oil color.

Relief valves are safety devices in hydraulic and pneumatic systems that are calibrated to open at a specific preset pressure. When system pressure reaches that set value, the valve opens to bypass or discharge the fluid, relieving the excess pressure and protecting components from overpressure damage. Once the pressure drops below the reseating point, the valve closes again, ready to act at the next overpressure event. This function is all about preventing pressure from rising too high, not increasing it, filtering oil, or changing oil color.