ELSÄSSER Filtertechnik GmbH offers top-quality liquid filters such as oil filters, fuel filters, and in-line filters for high-performance engines, equipment, and machines across a broad application spectrum. Our product range also includes compatible accessories for our liquid filters, such as filter heads for in-line installation, as well as visual or electrical service indicators and switches. Please see the following overview to determine which liquid filters are best suited for your requirements.
Which liquid filter types are available? Here is a brief overview.
Spin-on oil filters
Spin-ons (screw-on filter elements) ensure that the lubricating oil remains free from dirt particles, such as soot or unburned fuel, and thus prevent damage to the engine. The oil flows through them from the outside to the inside. The filtered lubricating oil exits the filter via the central bore. Depending on the requirements, these spin-on filters are equipped with (for example) bypass valves, non-return valves, etc.
Oil filter elements
Oil filter elements are used in main- and partial-flow filtration systems, among other things. In gasoline/diesel engines, these oil filter elements are usually housed in integrated oil filter modules that are permanently installed on the engine. Metal-free elements are also available – these components can be disposed of in an environmentally friendly manner.
Spin-on fuel filters
are similar to spin-on oil filters. However, they are mainly used for fuel filtration. Fuel filters are used to remove dirt particles and water from the fuel. Once separated, the water collects in a water collection chamber in the filter sump. Depending on the design, it can also be separated using a water drain plug. By performing its function, the fuel filter plays a key role in ensuring the operational safety of the engine.
Fuel filter elements
are mainly used for fine filtration of the fuel. They are usually installed in separate housings that are integrated in the engine.
In-line filters
for fine filtration are common in general mechanical engineering applications; for example, in lubricating oil circuits in hydraulic systems. They consist of a filter head with a connection nipple for spin-on oil filters. Optionally, in-line filters can be equipped with service indicators or maintenance switches to indicate when filter maintenance is necessary. In-line filters with spin-on fuel filters are also available.
Gap-type filters
are especially suitable for the filtration of even very heavily polluted liquids, such as lubricating oil, paint, polyol or isocyanate, as well as cooling lubricants.
Gap-type filters
can be cleaned during operation by turning a handle. The contamination is scraped off by means of a fixed scraper device and sinks into the sludge collection chamber in the base of the filter. From there, the contamination can be discharged via a ball valve. Of course, variants with geared motors are optionally available.
Centrifuges
are able to remove the finest soot particles from the partial flow. They are used, among other things, as an alternative to partial-flow filters. They contain centrifuges that do not require external power and are driven solely by the oil pressure – at speeds of up to 10,000 rpm via free-jet nozzles. Due to the high centrifugal forces, centrifuges can achieve a very high separation efficiency. After passing through the separator, the cleaned oil flows back into the oil pan without requiring additional pressure.
There are also other liquid filter types that are not listed here.
Where are liquid filters used?
Liquid filters are used in hydraulic systems, for engine and transmission oil filtration, in lubricating oil circuits, and in general mechanical engineering applications. They are also used in cooling systems, process water circuits in the food industry, and on ships. Liquid filters can be found in a wide variety of industries.
How does a liquid filter work?
The contaminated liquid is fed to the filter element via the inlet connection, where it is cleaned and then returned to the machine via the clean liquid connection.
Which filter media are available?
The chosen filter media must meet the highest quality requirements across the board – from production through to processing and installation. The standardized and most commonly used filters consist of cellulose and glass-fiber media. Due to ever-growing demands on the filter media, synthetic fibers and fully synthetic filter media are becoming increasingly popular. These media can be used in the range from 1 µm to approx. 40 µm. Since each filter medium has a clearly defined pore size and fiber structure, a consistently high degree of dirt removal is guaranteed throughout its service life. To ensure they can withstand mechanical, thermal, and climatic influences, the filter papers are usually impregnated with protective substances – almost without exception. Furthermore, “mesh media” with a filter fineness of 25 µm to 250 µm are also used. Of course, there are also screen baskets with a mesh size of up to 2 mm. In the field of wire gap-type filters, plate gap-type filters, and tube gap-type filters, the filter fineness/gap width typically ranges from 30 to 1,000 µm.
Which liquids can be filtered?
Almost any liquid can be filtered, depending on its viscosity. In order to design a suitable filter, certain parameters must be included in the calculation. These parameters are listed below.
Which parameters are relevant when designing a liquid filter?
Flow rate
Working pressure
Working temperature / ambient temperature
Type of contamination to be separated
Amount of contamination
Viscosity
Required service life
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