A relief valve is fitted to the main oil gallery of an engine. The purpose of relief valve is

Q. A relief valve is fitted to the main oil gallery of an engine. The purpose of relief valve is

A

Open when oil is hot

B

Maintain the supply when the gallery is blocked

C

Prevent oil flow to bearings

D

Limit the maximum oil pressure

Solution:

The engine oil is supplied at a pressure. So the relief valve is used as a safety valve to maintain the maximum pressure.
Oil flow rate for lubrication is generated by a positive displacement pump equipped with a pressure relief valve.
Usually present in the casing of the pump to prevent high oil pressures building up in the system and to deliver to the sump the exceeding generated flow rate.

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