Blowdown valve for automatic bleeding dirt and sludge
The water in the boiler contains salts, which are built up by the continuous evaporation. If these salts are not eliminated, bubbles and foam are formed when the density of the water increases.
To prevent these lime deposits forming, the water supply must be suitably treated, with the result that certain salts are changed producing impurities which form sludge and encrusted deposits which then adhere to the sides or the bottom of the boiler and to the combustion tubes, together with particles of dirt, remains of electrodes, carbonic acid, oxygen, etc.
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* Zoekterm: stoomwater, spuiafsluiter vuil en slurry, stoomboilers, steam water, bleeding valves dirt and slufge, steamboilers, VYC
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