What is the function of a relief valve in a hydraulic system?

What is the function of a relief valve in a hydraulic system?

• A. To convert hydraulic energy to electrical energy.
• B. To increase system pressure above the set limit.
• C. To filter contaminants from the fluid.
• D. To limit system pressure by venting fluid when pressure exceeds the set limit, protecting components.

Answer: (D)

A relief valve keeps hydraulic pressure from getting too high by venting fluid when the pressure passes the set limit. It stays closed during normal operation and opens only when the system pressure exceeds its preset value, directing fluid back to the reservoir or a lower-pressure path to lower the pressure. This spring-loaded device protects components like seals, hoses, and actuators from damage due to overpressure and ensures safe, reliable operation. It’s not intended to filter fluid or to boost pressure or convert energy.

A relief valve keeps hydraulic pressure from getting too high by venting fluid when the pressure passes the set limit. It stays closed during normal operation and opens only when the system pressure exceeds its preset value, directing fluid back to the reservoir or a lower-pressure path to lower the pressure. This spring-loaded device protects components like seals, hoses, and actuators from damage due to overpressure and ensures safe, reliable operation. It’s not intended to filter fluid or to boost pressure or convert energy.