Hydraulic Oil Purification Using Filtration Method

In most cases, hydraulic oil is used in the equipment which is sensitive to contamination.  Terefore, the defined technical requirements for these fluids are clear enough, and product manufacturers try to comply with them.

It’s not so long ago that all main consumers of hydraulic oil (machine tools, presses, etc.) were equipped with special filters with a cell size of 25 to 50 microns.  However, this size was not always adequate.  It was perfectly suitable for valve-type devices but not enough for systems with narrow passages and low expenditure.

If there is dirt or contaminants, the critical clearance has a direct impact on the functioning of the whole system and its degree of wear.  Now there is a stable formed classification of impurities that can cause a critical situation, in accordance with their size and number.

Experts identify primary and secondary contamination degrees of hydraulic fluids. Primary contamination occurs in the system prior to its commissioning and secondary contamination occurs after commissioning.

The value of purity and oil filtration has increased after the connection between contamination and roller bearing service life has been proved.

Over the past decades special filters have been used to remove solid particles from hydraulic oil.  Depending on the type of production equipment they can be installed:

• in a tank outlet channel to remove contaminants that made it into oil together with air;
• in the upper part of a tank for filtering hydraulic fluid, which is supplied thereto;
• in a tank circuit to improve the level of cleanliness of hydraulic oil;
• in recirculation lines;
• in filter presses that are filtering oil supplied to a pump.

The structure of a hydraulic filter includes a filter element and a contamination indicator. As a rule, the movement of oil through the device occurs from the outside inwards.

The correct choice of cell size depends on the requirements put forward by critical nodes, and is usually performed empirically.

Most often hydraulic systems utilize filters with cell size from 3 to 40 microns.  If a device with a cell size of 1, 3 or 6 microns has been selected, attention should be paid to its filter cloth.  The matter is that viscous additives and contaminants can simply block the filter.

GlobeCore company offers СММ plants to solve the problems of hydraulic oil filtration both from primary and secondary contamination.  The equipment is versatile because it can effectively filter not only hydraulic oil, but also transformer, turbine, transmission, and other types of oil.  The plants are available in a mobile version which is very compact. This makes them very convenient to use: rapid transportation from one hydraulic oil consumer to another one and the ability to work even in hard to reach areas of the production plant is a huge advantage.  Depending on the required degree of oil filtering, this equipment is available with different filtering capacity of up to 5 microns.

The application of GlobeCore oil filtration processes can significantly extend the service life of hydraulic oil, reduce warranty service costs and improve the reliability of the equipment in which this oil is exploited.