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Why shut-off and non-return valves are coupled in the boiler feed line?

29 Jun '18, 15:50

June 29, 2018, 3:50 p.m.
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Answer:

Two shut-off valves required for isolation purposed in case one of them starts leaking. The main function of the non-return valve in the pair is to prevent the steam and water in the boiler from discharging out by the feed line if a feed line fracture or a joint in the line blows.

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29 Jun '18, 15:55

June 29, 2018, 3:55 p.m.
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