Class 4 (4th Engineer) MEP 📅 Dec 2022

Exam Question

Describe what examination you will carry out on the following parts of Air Compressor

(a) Suction and delivery valves and seats (4)

(b) Relief valves and bursting discs, (4)

(d) Piston and piston rings (4)

Reference Answer

### (a) Examination of Suction and Delivery Valves and Seats (4 Marks)
A systematic and thorough examination of suction and delivery valves is critical for maintaining compressor efficiency and safety. The procedure is as follows:
1. **Removal and Marking:** Carefully remove the valve assemblies from the cylinder head. Mark each assembly (e.g., LP Suction, HP Delivery) to ensure they are returned to their correct positions. Disassemble the valve cage on a clean workbench.
2. **Cleaning:** Thoroughly clean all components (valve plates, spring plates, seats, guards, and springs) using an appropriate solvent like diesel oil. Remove all carbon deposits, as excessive carbonization can cause valves to stick, leading to reduced efficiency and overheating.

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