HYDRAULIC FILTERS

Artrec produces brand name and high-quality replacement hydraulic and fuel oil filters to meet the increased performance demands of today’s hydraulic systems including cartridges, spin-on, breathers, in line and return line filters. We take account of your requirements for cleanliness, high capacity, performance, reliability, filter life, and economy by optimum reliability in a wide range of temperatures with retention rates. We help your choosing for most effective media in your specific application from among celluse, micro glass, stainless wire mesh, epoxy or galvanized wire mesh.
 
Hydraulic filter element applications can be demanding. They require filtration products that can withstand a variety of difficult conditions in industrial and mobile applications. Harsh and severe conditions can often apply to hydraulic filter applications like mining or military applications. Hydraulic power systems require assorted components like pumps, valves, cylinders and motors to name a few. Keeping your system contamination-free with a quality hydraulic filter element can prolong the life of system components.
Artrec Filter manufacturers both stainless steel filter element products and metal felt filter element products for fluid power use. Either style can be cleaned to extend filter element life and reduce disposal costs.
Free and dissolved water in hydraulic systems can be removed using Artrec  Water Removal Filter Elements. These products are co-pleated with a special water absorber layer.
Our hydraulic filter elements are ideal replacements for many OEM elements and are designed to be functionally and dimensionally interchangeable to:
  • Pall® filter elements
  • Parker® filter elements
  • Vickers® filter elements
  • Hydac® filter elements
  • Donaldson® filter elements
  • Purolator® filter elements
  • Stauff® filter elements
  • Internormen® filter elements
  • and filter element products from other manufacturers
*All tradenames referenced are the trademarks, service marks or registered trademarks of their respective holders. Artrec Filter, Inc. does not claim to produce other manufacturer’s filters, breathers and/or strainer elements.
 
 
Filter types according to their structures;

    A. Surface Type Filters: follow a flat and smooth flow path. The contaminating particles are held at the surface of the filtration element. The dirt holding sensitivity of the filter is proportionate to the allowed pore size on the filtration element.
     The pore is of equal sizes. All the particles bigger than the filter pore size can be filtered. The particles with a small body but with a lengthy height can pass. As the filter continues to hold dirt, the filtration sensitivity increases and smaller particles can be trapped.

    Like all the filters, the sensitivity of this filter is defined by the size of particles they can hold. The unit of length is a micron (µ). 1 µ = 0,001mm. For example, a filter which can hold particles of 60 microns and above is defined as a 60-micron filter.

    B. Depth Type Filters: It has a labyrinth-like structure. These filters have a high capacity for dirt holding. Three types of filter elements are used such as cellulose, micro-glass and composite materials. Micro-glass filter media provide a more sensitive filtration when compared with other media by means of its fine fibered structure.
    Depth-type filters aren’t cleaned, they are replaced when they are dirty. This type of filters is manufactured with a casing.   When dirty, the cartridge is replaced. They have a higher capacity of filtration when compared with surface type filters.
   Depth-type filters are named after the size of particles they can hold. For example, For example, a filter which can hold particles of 20 microns and above is named as a 20-micron filter.

    It has the advantage of being manufactured with smaller sizes of pores. Most of the filters used in the return piping and pressure lines are depth type filters.

 
Filtration Element Dirt Holding Capacity Pressure Drop Life Price
Micro-glass High Medium High Medium
Cellulose (Paper) Medium High Medium Low
Wire Netting Low Low Medium High

There are standards formed according to the amount and size of the solid particles in the oil. These are ISO 4406, Nas 1638 and SAE standards.
 
ISO 4406 (ISO 11218) Nas 1638 (1964) Particle / Millimeters
4 microns 6 microns 14 microns
23/21/18 12 80 000 20 000 2 500
22/20/18 - 40 000 10 000 2 500
22/20/17 11 40 000 10 000 1 300
22/20/16 - 40 000 10 000 640
21/19/16 10 20 000 5 000 640
20/18/15 9 10 000 2 500 320
19/17/14 8 5 000 1 300 160
18/16/13 7 2 500 640 80
17/15/12 6 1 300 320 40
16/14/12 - 640 160 40
16/14711 5 640 160 20
15/13/10 4 320 80 10
14712/9 3 160 40 5
13/11/8 2 80 20 2,5
12/10/8 - 40 10 2,5
12/10/7 1 40 10 1,3
12/10/6 - 40 10 0,64

The main feature of the filter is to decontamination of the oil from the contaminating and corrosive particles that originate with time.  Therefore, at least one filter needs to be used in the hydraulic circuits. This filter consists of the filter casing and the filter cartridge. There may be elements on the casing such as check valves and contamination displays.
    The filter cartridge accommodates the filtration element. When the filtration element is dirty, the cartridge is replaced.

BETA NUMBER
Beta rate expresses the rate of solid particles held by the filtration element during the pass of the fluid through the filtration element. The beta rate is regarded as the efficiency of the filtration element.
Filtration rate Px= The number of solid particles going through the filtration element / The number of solid particles coming out of the filtration element.
For example, a filtration element with a beta rate of β10 = 2 holds 50% of the particles bigger than 10 µm. A filtration element with β10 = 200 beta rate holds 199 of 200 particles passing and has an efficiency of 99,5%. The beta rate is one of the most important criteria when defining the quality of the filtration element. A 20 µm filtration element with a beta rate of 200 is always better than a 10 µm filtration element with a beta rate of 2.

Let’s assume that the particle number before the filter is 100,000 X MICRONS
The number of particles that the filter couldn’t hold Beta Value β(x) Filter Efficiency
50.000 2 50,0%
5.000 20 95,0%
1000 100 98,7%
500 200 99,5 %
100 1000 99,9%
 
Micro-glass Media Particle Size β(x)≥200 Partikül Boyutu  β(x)≥1000 Dirt Holding Capacity  (gram/m2) ΔP=5 bar
MG 03 < 4  µm (c) 4  µm (c) 218
MG 06 7,1  µm  (c) 8,7  µm (c) 200
MG 10 13  µm (c) 15,7 µm (c) 215
MG 20 20  µm (c) 21,5 µm (c) 238
MG 25 23,6  µm (c) 29,6 µm (c) 127
 
Artrec Filter manufactures high-quality equivalent products of all the big hydraulic filter manufacturers. Artrec Filter is manufactured in Turkey and it is the first and only filter brand that is β(x)≥200.
The micro-glass filter media we use are “Multipass Test” and dirt holding capacity test approved.

FILTER MEDIA CERTIFICATE
 
Typical Properties USA Units Metric Units Test Methods
 
Basis Weight 52 lbs/3000ft2 87 grams/m2 T.A.P.P.I-T-410
A.S.T.M.-D-646
Thickness 23 mils 0.56 mm T.A.P.P.I.-T-411
Efficiency (Flat Sheet)          
Beta 200 13.0 micron 13.0 micron ISO-16889
Beta 1000 15.7 micron 15.7 micron ISO-16889
Dirt Holding Capacity (Flat Sheet) 2 bar 99 mg/in2 155 grams/m2 ISO-16889
Dirt Holding Capacity (Flat Sheet) 5 bar 138 mg/in2 215 grams/m2 ISO-16889
Air Resistance 4.0 mm H 20 39 Pa MIL-STD-282
A.S.T.M.-D2986-91
Air Permeability 37 cfm 18.8 cm3/cm2/s T.A.P.P.I-T-251
Mean Flow Pore 9.8 micron 9.8 micron PMI Porometer
Max Pore 24.4 micron 24.4 micron PMI Porometer


 
 
Filter Beta Ratios
The Beta Ratio equals the ratio of the number of particles of a minimum given size upstream of the filter to the number of particles of the same size and larger found downstream. Simply put, the higher the Beta Ratio the higher the Capture Efficiency of the filter.
Filtration Ratings Defined
Filter ratings are an often misunderstood area of contamination control. The most commonly used rating is the Beta Ratio, which is defined as the ratio of the number of particles upstream of the test filter versus the number downstream, greater than a given size. Using the Beta Ratio, a 5-micron filter with a Beta 1000 Rating, will have on average 1000 particles larger than 5 microns upstream of the filter for everyone 5 microns or greater particle downstream.
The efficiency of the filter can be calculated directly from the Beta Ratio since the % efficiency is simply (beta-1)/beta x 100. A Beta 1000, 5-micron filter is thus said to be 99.99% efficient at removing 5 micron and larger particles.
Caution must be exercised when using Beta Ratios since they do not take into account field operating conditions such as pressure surges and changes in temperature, which can affect real-life performance. A filter’s Beta Ratio also does not give any indication of its dirt holding capacity, the total amount of material that can be trapped by the filter throughout its life, nor does it account for how the capture efficiency changes over time. Nevertheless, Beta Ratios are an effective way of gauging the expected performance of a filter.
 
Beta Ratios Capture Efficiency
1.01 1.0%
1.1 9%
1.5 33.3%
2.0 50%
5.0 80%
10.0 90%
20.0 95%
75.0 98.7%
100 99.0%
200 99.5%
1000 99.9%
 
 

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