Vacuum filters can be used at negative pressures as low as -950 mbar. They ensure air-tightness and are characterized by a compact design.
Where are vacuum filters used?
Vacuum filters are predominantly installed in vacuum systems that must consistently maintain a negative pressure as low as -950 mbar. Vacuum filters prevent contamination and extend the service life of the vacuum generator.
How do vacuum filters work?
A vacuum filter functions in the same way as a traditional air filter, in which contaminated air is fed to the filter medium (traditionally cellulose) via the air-intake nozzle, before being recirculated through the system via the clean-air nozzle.
Which filter media are available?
ELSÄSSER Filtertechnik relies on cellulose media, polyester media, activated carbon media, and stainless-steel filters with a fineness of 60 µm for vacuum filter applications.
In addition, we can supply steel mesh elements, so-called wet-type air filters, air deoilers, as well as filter elements containing activated carbon. These options turn our vacuum filter housings into highly flexible solutions.
Filter housings – materials
Black painted steel is used as standard. Stainless steel and nickel-plated steel are also available for use in the food and chemical industries.
If required, a discharge lug can also be welded on to the filter. However, to ensure ATEX conformity, an ATEX-compliant air filter element must then also be installed.
Structure of a vacuum filter
The housing and lid are made of sheet steel. The threaded sleeves are extremely robust turned parts – they are fitted/welded into the housing. All welds are full-penetration welds. The lid is pressed tightly against an elastomer seal by means of locking clips.
The standard air filter element has a filter fineness of 5 µm (99%), the initial flow resistance is approximately 20 mbar at nominal load.
Our vacuum filters are therefore extremely robust – a factor that actually matters more during installation than during their subsequent operation. Tapered threads/water pipe threads are used as the connecting elements. This means that sturdy threaded sockets are essential.
Air deoiling option
Optionally, air/oil separator elements can be installed in the housing instead of filter elements. This changes the direction of flow, whereby the separated oil is collected outside the air/oil separator element – if required, an additional small ball valve can be installed for easy drainage of the separated oil from the housing.
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