Compressed
Air Filters
 
MTA high-efficiency filters are capable of removing particulate, oil and water
droplets, many vapors and odors associated with air compressor lubricants. Filter
elements are available in many configurations such as pleated paper, activated
carbon, and many others that fit most any application. Our
filter housings can be manufactured in a variety of materials to suit critical
duty such as chemical or corrosive atmospheres or special applications such as
high temperature compressed air. Filters
are available with several options not limited to delta-P gauges, delta-p color
change indicators, electronic or float operated drains.
HEF High Efficiency Filters
Reinforced
filter media
(for increased resistance to mechanical stress
)
| Traditional Filter Media |
Reinforced Filter Media |
Advantages:
Pulsations or sudden
variations in pressure when valves are opened or
closed are normal
occurrences in a compressed air distribution network.
In
the long term, however, they may alter the structure of the glass
micro-fiber of the
filter media. For this reason, MTA uses a filter material
consisting of two
different layers, bonded together by an innovative
lamination
process. The first layer comprises traditional glass
micro-fiber
material; the second is
a non-woven fabric with excellent mechanical
resistance. The
lamination of the two materials considerably increases
the mechanical
characteristics of the glass micro-fiber, improving stability
and resistance to
pressure variations.
Chrome plated
aluminum
to eliminate corrosion
|
Traditional Filter |
Chrome Plated Aluminum Filter |
Advantages:
-
Longer average working life than a traditional filter.
-
Improved air quality
-
Less drainage problems
-
All HEF aluminum filter bodies are chrome plated as follows:
-
High temperature degreasing
-
Anti-oxidation treatment
-
Chrome plating of the aluminum
-
Passivation of the metal
As
a result this material can withstand over 250 hours of exposure to saline
mist
according to the ASTM B-1 17 standard. Otherwise, as well as
necessitating
early element replacement, aluminum corrosion could reduce
the
quality of the air and its presence could cause problems with the filter
drain
mechanism. The filter bodies are polyester powder coated with a
textured
finish and a thickness of
50-160 microns.
Self-retaining
filter elements
to
simplify replacement operations
More
Advantages:
All
HEF filters (except for model HEF 240) incorporate this innovative
self-retaining
fitting system. The element is simply inserted into
the
collar
within the head and then screwed into position. The filter remains
locked
in position between the head and the supports in the filter bowl.
Unlike
traditional filters, a tie-rod is not needed to fix the element.
Another
advantage of the absence of the tie-rod is that there is
no need
to
leave as much space below the filter for removal of the element.
Rigorously designed and tested
The HEF filters -are the result of a major program by MTA to study and
develop new materials and technologies for improving the performance
and reliability of the filtration process. In order to achieve these objectives,
the engineers have made full use of MTA's computer-controlled test facilities,
the instrumentation and methods of which are certified to the IS09001
standard. Here, tests with compressed airflow rates of up to almost 3000 cfm
at 100 psig can be performed at a full range of temperature and humidity values.
The filters were tested in compliance with ISO international standards.
Pre-Filter
filter
grade P, 3 micron
The
compressed air flows through the filter element from the inside to the Pneumatic
conveying outside. It first meets a two-layer filter
media (2). The first layer, made from glass micro
fiber, is laminated to a second layer of non-woven
fabric. This sheet is wrapped around an AISI 304
stainless steel cylinder (1). The individual solid
particles are intercepted and stopped by the
glass micro fiber. Further layers of non-woven
polyester (3) are wrapped around the filter material (2). A second cylinder in AISI 304
stainless steel (4) encloses and supports the filter media. Two plastic end caps (5)
complete the filter element.
Coalescing
Filter
filter
grade M, 1 micron grade S, 0.01 micron. Max. remaining oil content
grade
M, 0.5 mg/m3, grade S, 0.01 mg/m3
The compressed
air flows through the filter element from the inside to
outside. It first meets the two-layer filter material (2).
The first layer, from glass micro-fiber, is laminated to a
second layer of non-woven polyester. This sheet is wrapped
around an AISI 304 stainless steel cylinder (1). The
individual solid or oil aerosol particles are
intercepted and stopped the glass micro-fiber. Further layers
of non-woven polyester (3) are wrapped around the
filter media (2). A second cylinder in AISI 304 stainless steel (4).
The air-borne oil is
filtered by exploiting the so-called "coalescing" effect. Depending on their size, the
particles are blocked by the layers of micro-fiber (2) by direct interception, inertial impaction or
Brownian motion, and group together to form larger droplets. These are pushed
towards the outside and percolate by gravity down the
open-cell polyurethane lining
(6).
Activated
Carbon Filter
filter
grade A. Max. remaining oil content 0.003 mg/m3
The
compressed air flows through the filter element from
the inside to the outside. It first meets the two-layer
filter material (2). The first layer, made from glass
micro-fiber
impregnated with particles of activated carbon,
is laminated to a second layer of non-woven polyester
fabric. This sheet is wrapped around an AISI
304 stainless steel cylinder (1). The oil vapor and
odors absorbed by the large quantity of activated carbon
(one gram of carbon is equivalent to an absorbing surface of about 8,61 1 ft2). Further
layers of non-woven polyester (3) are wrapped around the filter material (2). A
second cylinder in AISI 304 stainless steel (4) encloses and supports the filter media.
Two plastic caps (5) complete the filter element.
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