Class 2 (2nd Engineer) MEP 📅 Jan 2025

Exam Question

With reference to main engine starting and reversing:

(a) Define the function of the automatic valve and how it is controlled. (5)

(b) State what provisions are made to control the engine in the event of automatic valve failure. (5)

Reference Answer

Main Engine Starting and Reversing
(a) Function and Control of the Automatic Valve
The automatic valve , also known as the automatic air start valve or main starting valve , serves as the master control valve for the main engine's high-pressure starting air. Its primary function is to control the supply of high-pressure air from the air receivers to the engine cylinders via the air distributor, initiating the engine's rotation.
The valve's control is typically pneumatic, regulated by low-pressure pilot air pressure and operated via the main engine's manoeuvring handle (or remote control system).

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