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What is Oil Filter?
The most common way to remove particles in oil is to install an oil filter.
There are various types of oil filters depending on fluid type, installation location, max working pressure, filtration rating, and application.
It is important to select the correct filter for the individual purpose.
Filter Line-up
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Cyclone filter
Separation of coolant sludge by centrifugal force. Since no element is required, maintenance costs can be reduced.
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Duplex Filter
One of line filter that used for continuously operated system that cannot be shut-down temporarily for maintenance.
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Return Filter
Installed in a return line to remove particles generated in a whole circuit and avoid tank pollution.
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Cartridge Filter
Installed at pump outlet or in a return line. Easy maintenance (element replacement).
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Air Breather
Installation at the air inlet of the tank prevents contamination from entering the tank at the same time as intake air.
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Off-line Filter
Directly installed to a tank and operated by attached pump to improve cleanliness of tank oil.
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Why is Oil Filter needed?
Over 70% of all hydraulic system failures are caused by contaminants in fluid/oil.
Oil is always contaminated during operation.
Contaminants are generated by wearing of components and come from air inlets or clearance of cylinder rods, and they keep contaminating oil in a system.
What contaminants causes?
・Oil sludge generation
・Severe wearing
・Performance reduction of lubrication
・Clogging
What’s why you need oil filters!
What is Filter Element?
Many types of filter element are available: utilizing TAISEI’s original media, common paper, wire gauze, various filtration rating, and so on.
We produce highly reliable filter element by strict quality control.
Paper Element (Model code: U)
The most common paper element.
Although inexpensive model, it is same structure and manufactured under the same quality control as other high spec elements.
Wire gauze Element (Model code: W, UW)
An element with woven stainless-steel wire. It is reusable by washing.
There are brass wire gauze elements from other manufacturers, however we select stainless-steel that has high durability in order to maximize the reusable characteristic.
Filtration rating is lined up from rough wire gauze representing "Mesh" to fine wire gauze representing "Micron".
Notch wire Element (Model code: K, UK)
An element constructed with fine stainless-steel dimple wire and particles are trapped by these dimple gaps.
Dimple wire is processed in our factory, and it enables higher filtration performance than wire gauze element.
The element is washable and reusable, and flat surface makes cleaning easier.
C-fiber Element (Model code: C, CH)
TAISEI original high-performance element that filtration rating is guaranteed by the multi-pass test method.
Uniformed fine glass fiber is used for filtration media, and it enables high porosity, high filtration rating, and long service life.
Structure of Filter Element
Following element structures are for flow direction "OUT→IN" type as examples.
| 1) Filtration media | Filtration media is pleated and rolled. Please refer to "What is Filter Element?" for details. |
|---|---|
| 2) End plate | Metal parts at the both ends. Galvanized steel (SECC) or Stainless-steel (SUS304) for standard. |
| 3) Inner tube | Support of filtration media. Galvanized steel (SECC) or Stainless-steel (SUS304) for standard. |
| 4) Adhesive | Epoxy adhesive to bond media, inner tube, and end plates. |
| 5) O-ring | Sealing parts, O-ring or packing, is installed between filter body and element. |
| 1) Notch wire | Dimples are processed on stainless-steel wire (SUS304). |
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| 2) End plate | Metal parts at the both ends. Galvanized steel (SECC) for standard. |
| 3) Fin tube | Aluminum support guide (A6063) for notch wire. |
| 4) Adhesive | Epoxy adhesive to bond media, fin tube, and end plates. |
| 5) O-ring | Sealing parts, O-ring or packing, is installed between filter body and element. |
Fluid Suitability Table
The table below shows suitability to typical specification of each fluid type and fluid suitability.
Please note that some fluid might not be available depends on filter model.
| Fluid type | Fluid code | Sealing material | |
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| Mineral oil / Gear oil | (None) | NBR | JIS B2401 Class 1 A equivalent |
| Ammonia-containing oil ※1 | A | NBR | JIS B2401 Class 1 A equivalent |
| Brake fluid | B | EPDM | JIS B2401 Class 3 C equivalent |
| Fatty ester fluid | C | NBR | JIS B2401 Class 1 A equivalent |
| Phosphate ester fluid | F | FKM | JIS B2401 Type 4 D equivalent |
| Water-glycol fluid | G | NBR | JIS B2401 Class 1 A equivalent |
| Refrigerant oil | R | ※2 | |
| Fuel oil (Kerosene, Gas oil, Diesel oil) | S | NBR | Equivalent to JIS B2401 2 types |
| High water based fluid (HWBF) | W | FKM | JIS B2401 Type 4 D equivalent |
※2 Depends on the type of refrigerant. Please contact us.
Evaluation of Filter Performance
Evaluation of filter performance is regulated in JIS B8356/ISO11170.
Each test method is introduced below. Please refer to the corresponding JIS/ISO standard for more details.
| Evaluation method | Corresponding JIS/ISO No. |
|---|---|
| Verification of fabrication integrity of filter element | JIS B8356-2（ISO2942） |
| Destructive testing of filter element | JIS B8356-3（ISO2941） |
| Verification of material compatibility of filter element | JIS B8356-4（ISO2943） |
| End load testing of filter element | JIS B8356-5（ISO3723） |
| Flow fatigue characteristics testing of filter element | JIS B8356-6（ISO3724） |
| Differential pressure – flow characteristics testing | JIS B8356-7（ISO3968） |
| Multi-pass test for filtration performance evaluation | JIS B8356-8（ISO16889） |
| Sample extraction method from working system line | JIS B9936（ISO4021） |
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