Elevator Mechanic Practice Exam

Working pressure on a Hydro is 400psi. What is the maximum relief valve setting?

1. 450psi

2. 500psi

3. 600psi

4. 700psi

The correct answer is: 450psi

The maximum relief valve setting is typically set above the working pressure to allow the system to operate safely without tripping the relief valve under normal conditions. In this scenario, with a working pressure of 400 psi, the relief valve should be set high enough to accommodate fluctuations in pressure while still ensuring it activates if the pressure exceeds safe limits. Setting the relief valve at 450 psi provides a safety margin above the working pressure, allowing it to handle any slight increases in pressure without immediately engaging. This setting also conforms to safety standards, which dictate that relief valves should prevent potentially dangerous over-pressurization of the hydraulic system. Higher relief valve settings like 500 psi, 600 psi, or 700 psi may not provide the necessary safety and could risk a failure to relieve pressure when it actually exceeds safe operating limits, which could lead to equipment damage or safety hazards.