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Brass-bodied float valve. An automatic bleeding valve or air release valve (ARV) is a plumbing valve used to automatically release trapped air from a heating system. Air, or other gas, may collect within plumbing. For water delivery systems to taps and basins, particularly with good main supply pressure, this air is usually flushed through with ...
The heating and DHW demands usually differ, and since installers will select a boiler to meet the larger demand (which is usually DHW in most homes), it will be oversized for the smaller demand; an oversized boiler will operate less efficiently due to problems such as short cycling and having increased return water temperatures that reduce ...
Safety valve an automatic valve used to release excess pressure within the boiler. Scale dissolved minerals from hard water that precipitate out in the steam space around the water-level. Where this scale falls to the bottom of the boiler and mixes with other contaminants, it is termed mud. Scum valve
A means had to be provided, of course, to put the initial charge of water into the boiler (before steam power was available to operate the steam-powered feedwater pump). The pump was often a positive displacement pump that had steam valves and cylinders at one end and feedwater cylinders at the other end; no crankshaft was required.
In general, valves nearest to the boiler should vent the slowest, and valves furthest from the boiler should vent the fastest. [citation needed] Ideally, steam should reach each valve and close each and every valve at the same time, so that the system can work at maximal efficiency; this condition is known as a "balanced" system. [citation needed]
A back boiler is a device which is fitted to a residential heating stove or open fireplace to enable it to provide both room heat and domestic hot water or central heating. The device is water filled heat exchanger enclosed at the rear of the burning chamber, with a hot water output at the top of the chamber and a cold water feed at the bottom.
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