Bottom blow down valve

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Scale deposits thermally insulate heat exchange surfaces initially decreasing the rate of steam generation, and potentially causing boiler metals to reach failure temperatures. The quantity of make up water is determined by installing a water meter in the make up water supply line that serves the feedwater unit. Sludge may form from dirt in the water supply or from the water treatment chemicals. Kindly refer the diagram to understand the blow down procedure properly. The intermittent blowdown action of the valves is triggered by controls such as the TA 7, for example. There are 2 types of Blowdown.
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Boiler blowdown - Wikipedia

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Care is taken to avoid trapping scale or rust particles within the valve by reopening a valve to flush the particles through if resistance is encountered when attempting to close it. In all cases, it is important to ensure adequate isolation for maintenance purposes and the prevention of reverse flow. This can be done most simply by staggering the setting times of the individual blowdown timers, or by setting the individual blowdown times in sequence. We build our own valves, so we can custom-build for you.
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