Oil relief valves help prevent which of the following issues?

Oil relief valves are crucial components in hydraulic systems that help regulate pressure and prevent over-pressurization. When the system experiences a pressure increase that exceeds a predetermined limit, the oil relief valve opens to allow excess hydraulic oil to escape from the system. This action prevents a condition known as hydraulic lock, which can occur when hydraulic fluid becomes trapped, causing excessive pressure that could potentially damage components or lead to system failure.

In addition, oil relief valves ensure that the hydraulic system operates within safe pressure limits, thus contributing to the longevity and reliability of the system. By maintaining optimal pressure levels, these valves protect against scenarios that could lead to equipment malfunctions, breakdowns, or even dangerous incidents involving hydraulic systems.

Moisture buildup and high air pressure are not directly related to the function of oil relief valves, meaning that those options do not accurately reflect the purpose of these devices within hydraulic systems.