What is the primary function of a relief valve in an elevator system?

The primary function of a relief valve in an elevator system is to prevent pressure buildup. Relief valves are designed to open at a predetermined pressure level to release excess hydraulic fluid, which helps maintain safe operating conditions and protects other components of the hydraulic system from damage due to excessive pressure. By ensuring that pressure does not exceed safe limits, the relief valve contributes to the overall reliability and safety of the elevator.

In systems that use hydraulic elevators, the relief valve plays a critical role in managing the hydraulic fluid used to lift and lower the elevator car. Without this safety mechanism, there is a risk of catastrophic failure in the hydraulic system, which could lead to hazardous situations. Therefore, the correct answer emphasizes the valve's essential role in maintaining safe pressure levels, ultimately ensuring the smooth operation of the elevator system.