Exam Question
Sketch and explain the construction of a feed Check Valve. Why is it known as double shut off arrangement? (16)
Class 4 (4th Engineer)
MEKG
📅 Nov 2025
Reference Answer
### **1. Purpose and Location**
The Feed Check Valve is a critical boiler mounting fitted to the boiler shell, typically below the normal working water level. Its primary functions are:
* **To regulate the supply of feed water** from the feed pump into the boiler.
* **To automatically prevent the backflow** of high-pressure water and steam from the boiler to the feed line. This is crucial to protect the feed pump from reverse rotation, over-pressurization, and thermal shock when the pump is stopped or its delivery pressure falls below the boiler pressure.
The Feed Check Valve is a critical boiler mounting fitted to the boiler shell, typically below the normal working water level. Its primary functions are:
* **To regulate the supply of feed water** from the feed pump into the boiler.
* **To automatically prevent the backflow** of high-pressure water and steam from the boiler to the feed line. This is crucial to protect the feed pump from reverse rotation, over-pressurization, and thermal shock when the pump is stopped or its delivery pressure falls below the boiler pressure.
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