Boiler Guard; Functional Description; Technical Description - Meibes MHK 25 Technische Information Für Montage Und Betrieb

2. Boiler guard

2.1 Functional description

Combined air and gas separator with dirt and sludge trap. With hydraulic diverter for decoupling the flow rates in the boiler
and heating circuits. Also available as a variant without a hydraulic diverter.
The air separator
The supply water flows from the boiler against a deflector plate before settling in the upper part of the boiler guard,
allowing the air bubbles it contains to rise and collect. The water flowing back into the return line from the heating circuits
releases the air it contains via the perforated plates and the venting channel also located in the upper collection chamber.
The air is continuously guided outside by an automatic air vent.
The hydraulic diverter
The supply water coming from the boiler is guided within the boiler guard by a flow straightener and, depending on the
quantity that is needed, is fed into either the heating circuits or via its perforated plates to the boiler return line. The
resulting hydraulic decoupling makes the boiler guard a neutral zone for dynamic pressures. The perforated plates prevent
turbulence and enable a clean stratification of temperatures despite the low construction height. If the hydraulic diverter is
not required, e.g. in condensing boilers, the perforated plates are replaced with unperforated separation plates (type OW,
colour black). This keeps the supply and return lines separated from one another.
The dirt and sludge trap
The water coming from the heating circuit is diverted by the deflector plate and settles in the boiler guard. Any impurities
in the water settle and can be removed via the drain valve below. It is also possible to integrate a magnetite separator to
collect any magnetic particles and magnetite. This is cleaned by removing the magnets. The particles sink to the base and
can be rinsed away via the drain valve. As the magnets are installed in protection tubes, the system remains closed and
does not need to be drained. (See Point 6 Service)

2.2 Technical description

Boiler guard K (DN 25-32)
Housing: welded, rectangular housing with connecting pieces of flanged pipes with union nuts;
Boiler supply line and boiler return line axial distance = 125 mm, connection 1 1/2" internal thread flat sealing for DN 25
and 2" internal thread flat sealing for DN 32
Heating system supply line and heating system return line axial distance = 125 mm, connection 1 1/2" internal thread flat
sealing for DN 25 and DN 32
Suitable for Meibes distributor and pump groups, with automatic air vent and drain ball valve and two magnet cartridges
3/4" (optional). Thermowell for temperature sensor contained in cover. Fully insulated, incl. seals. Maximum permissible
pressure rating PN 6 Maximum permissible temperature 110 °C
Variants with pre-installed magnet cartridges.
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