Exam Question
(a) Sketch and describe an air starting valve. (8)
(b) How an explosion may be propagated in the starting airline. Describe the protective device (8)
Class 4 (4th Engineer)
MEKM
📅 Sep 2022
Reference Answer
### (a) Air Starting Valve: Sketch and Description
#### Concept
An air starting valve is a timed, pilot-operated, non-return valve fitted to the cylinder head of a marine diesel engine. Its primary function is to admit a large volume of high-pressure air (typically 30 bar) into the cylinder at the correct moment in the engine cycle to turn the crankshaft for starting. The timing is controlled by a separate pilot air signal from the starting air distributor.
#### Construction
#### Concept
An air starting valve is a timed, pilot-operated, non-return valve fitted to the cylinder head of a marine diesel engine. Its primary function is to admit a large volume of high-pressure air (typically 30 bar) into the cylinder at the correct moment in the engine cycle to turn the crankshaft for starting. The timing is controlled by a separate pilot air signal from the starting air distributor.
#### Construction
Full answer on MeoMock — surveyor-grade reference answers for 7,000+ written exam questions.
Prepare on Android — MeoMock on Google Play