Class 4 (4th Engineer) MEKG 📅 Apr 2024

Exam Question

(a) With a line diagram, explain the working of the Quick Closing Valve? (8)

(b) Why do you need the Quick Closing Valves on the fuel and lube oil lines? (3)

(c) Explain how to reset the valve after a trial. How is the periodic test carried out and what are the areas of concern that need special attention. (5)

Reference Answer

### (a) Working Principle of a Quick Closing Valve (QCV)
A Quick Closing Valve (QCV) is a safety device designed for the rapid, remote shut-off of flammable fluid supply lines (e.g., fuel oil, lube oil) to machinery spaces in an emergency, primarily a fire. Its operation is fail-safe, meaning it closes upon loss of control power.
#### Construction
1. **Valve Body**: Typically a globe or angle-type valve, designed for positive shut-off. It contains the valve seat against which the disc closes.

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