Product category:
Machine Building Components
News Release from: NTZ Nederland | Subject: Radial Micro Filters
Edited by the Engineeringtalk Editorial
Team on 26 October 2005
Novel filter extends equipment life
The patented NTZ Radial Micro Filter maintains contamination in oil to an absolute minimum and extends the useful life of any production equipment.
The cleanliness level of new oil is often not high enough to meet the technical specifications of many component suppliers What's more, during the assembly process of a new system the fresh oil can become more contaminated before its first use
This article was originally published on Engineeringtalk on 5 Aug 2003 at 8.00am (UK)
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In use, the oil is contaminated even further: by wear, by ground dirt particles, by moisture and by other factors.
This causes more wear and breakdowns, resulting in higher maintenance costs, downtime and loss of productivity.
So it is very important to keep the amount of dirt in the oil to a minimum.
The patented NTZ Radial Micro Filter does exactly that - and extends the useful life of any production equipment.
The benefits of cleaner oil from Radial Micro Filtration include: fewer breakdowns; less wear; extended intervals between services; structural cost savings; longer system life; better performance; longer oil life; and less environmental impact (less waste oil).
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The system has applications in lubrication oil, thermal oil, transmission oil, fuel and hydraulic oil.
The stability of oil's chemical properties depends on several factors, including the level of impurities in the system and the size of any dirt particles present.
Metal particles oxidise in the presence of air, moisture and heat.
For example, a nail dropped into a tank will have little effect on the oil and is very unlikely to damage pumps or other vital components.
But grind that nail into very small particles and every one of them will oxidise, accelerating the degradation of the additives in the oil.
And those particles will find their way into the system, where they can cause untold damage.
Looking at oil contamination under the microscope, we see that the individual particles have different dimensions.
The level contamination is measured using an ISO or NAS standard.
ISO standard 4406 covers the numbers of contaminating particles measuring 2, 5 and 15um (in ISO4406:1999, those dimensions are 4, 6 and 14um).
ISO17/15/11 covers such things as proportional valves, and so requires reasonably clean oil, with the following maximum numbers of contaminant particles per 100ml of oil: 2,000,000 x 2um particles (range 21); 250,000 x 5um particles (range 18); and 4000 x 15um particles (range 12).
ISO 21/18/12 is often used in systems without bypass filtration, and specifies: 130,000 x 2um particles (range 17); 32,000 x 5um particles (range 15); and 2000 x 15um particles (range 11).
These are quantities per 100ml of oil, which in the case of ISO17/15/11 equate to the transfer of approximately 22kg of contamination per annum at a pump capacity of 200 litre/min, 8 hours a day over 230 working days - a standard workload for a hydraulic system.
It appears, then, that the majority of oil contamination consists of particles measuring less than 10um.
An inline or return filter usually has a screen measuring between 10 and 25um, to allow large amounts of oil to flow through.
But it also means that the filters fail to capture the majority of the small contaminants, even though it is those very tiny particles that are responsible for damaging cylinder walls, piston rods etc.
Moreover, a bypass filter is more than 10 times more effective than an inline filter.
This is due to the materials used and the structure of the filter.
The oil's rate of flow through an inline filter varies and compression pulses can occur, neither of which enhances the performance of the filter.
As the name indicates, bypass filtration occurs outside the main flow of the oil system, under constant pressure.
It can use either axial or radial circulation through the filter element.
NTZ has been producing bypass filters using the radial circulation principle since 1970.
Unlike axial circulation, this approach precludes canalisation between the media layers in the filter element.
The patented NTZ filter is a Radial Micro Filter with an official, ISO-certified beta (efficiency) value for its cleanliness.
The filter operates continuously, always purifying the oil in the system.
The NTZ Radial Micro Filter is totally safe and reliable.
Even if The NTZ system is blocked for any reason, the standard oil circuit remains intact and fully functional.
The NTZ filter system has proven itself over many years, both in hydraulic applications and in internal combustion engines and transmissions.
NTZ is a tier supplier to the automotive industry - ie its filters are fitted during vehicle production - and is ISO/TS16949:2002 and ISO14001:1996 certified.
So NTZ products meet the very highest quality standards.
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