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What is the function of Blow down valve of a boiler?

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What is the function of Blow down valve of a boiler?

(a) To remove sludge

(b) To build sediments

(c) To remove Flue gas

(d) To remove ash

I got this question in an internship interview.

The doubt is from Boiler Mounting Accessories topic in section Steam Generators & Accessories of Energy Engineering

1 Answer

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Correct choice is (a) To remove sludge

Explanation: Blow down valve is also called as Blow-off-cock. The function of this valve is to remove the sludge or sediments collected at the bottom of the boiler drum from time to time. Whenever boiler cleaning and inspection is due, water inside the tubes and in the boiler drum can be completely drained by operating the blow down valve.

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