The regulating valve maintains what type of oil pressure as engine speed and temperature vary?

• A. High oil pressure
• B. Low oil pressure
• C. Even oil pressure
• D. Decreasing oil pressure

Answer: (C)

Oil pressure in the engine lubrication system is kept at a steady, even level as speed and temperature vary. The regulating valve senses downstream pressure and bypasses excess oil back to the sump when pressure rises, or reduces bypass when pressure would drop, so the pressure reaching the bearings stays within a narrow range. This keeps lubrication consistent across different operating conditions, preventing both wear from low pressure and damage from high pressure.