Exam Question
Sketch and explain the construction of a feed Check Valve. Why is it known as double shut off arrangement?
Class 4 (4th Engineer)
MEKG
📅 Jan 2025
Reference Answer
### 1. Concept and Purpose
The Feed Check Valve is a critical boiler mounting located on the boiler shell or drum at the point of feedwater entry. Its primary functions are twofold:
1. **To control the admission of feedwater** from the feed pump into the boiler.
2. **To automatically prevent the backflow** of high-pressure water and steam from the boiler into the feed line. This is crucial when the feed pump is stopped or when its discharge pressure falls below the boiler's internal pressure, thus protecting the pump and piping from overpressure and thermal shock.
The Feed Check Valve is a critical boiler mounting located on the boiler shell or drum at the point of feedwater entry. Its primary functions are twofold:
1. **To control the admission of feedwater** from the feed pump into the boiler.
2. **To automatically prevent the backflow** of high-pressure water and steam from the boiler into the feed line. This is crucial when the feed pump is stopped or when its discharge pressure falls below the boiler's internal pressure, thus protecting the pump and piping from overpressure and thermal shock.
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