Hydraulic oil as a working medium for hydraulic transmission, the cleanliness of its good and bad on the working performance and service life of hydraulic components have a significant impact, which is an indisputable fact. With the wide application of hydraulic technology, hydraulic systems in the metallurgical industry, maintenance and operating costs have increased. The role of the filter is to improve the cleanliness of the fluid, minimize the failure of the hydraulic system, extend the life of hydraulic components. For how to effectively and economically select the hydraulic filter box, to reduce the maintenance and operating costs, often for various reasons and not by the user's attention. This article will introduce you to some of the purchase skills.
1. Hydraulic filter box dirt capacity. Talking about the selection of hydraulic filter box, it is also necessary to mention the dirt-holding capacity. Because the service life of the hydraulic filter box not only depends on the condition of the hydraulic system clean, but also in its own dirt capacity. Generally speaking, hydraulic filter box dirt capacity and its filtration accuracy is inversely proportional to the differential pressure on it is directly proportional. There are also large differences between the products of different manufacturers. Hydraulic filter box dirt capacity, in addition to longer service life, but also because of the reduction in the number of times to replace the filter element and bring less pollution to the system.
2. Hydraulic fluid viscosity. Hydraulic fluid viscosity has a great impact on the size of the hydraulic filter box. When choosing a filter, many people tend to ignore this factor, and often choose a larger hydraulic filter box than the actual need, resulting in higher operating costs. A hydraulic filter box that is undersized and has too high a pressure drop causes the clogging indicator to trip prematurely. Hydraulic filter tanks that are oversized lead to high costs, large footprints, and high replacement costs. We should select filters based on the exact minimum temperature after fully understanding the normal temperature range of the hydraulic system.
3. Hydraulic system. We need to be clear about the hydraulic components that are installed in the hydraulic system circuits, which, according to industry standards, need to have the appropriate standardized filter type. This standard helps determine the correct type of filter element. For example, a proportional valve in a circuit may require a 20/18/15 ISO cleanliness code, and in order to meet the criteria set by the ISO code, the circuit would require a filter with 3 µm or 6 µm absolute filtration. Pressure drop, cost, and other factors also need to be considered when selecting a filter size. Knowing what hydraulic components come with the filter and how they affect the performance requirements of the filter can save money.
4. Filter cartridges. From an economic point of view, the higher the precision of the same type of hydraulic filter box cartridge, the higher its price. But the same filtration accuracy cartridge, pressure filters than circulating filters to be 30% to 40% more expensive; in the larger tank, the number of general pressure filters are more than the number of circulating filters; and every time you replace the pressure filter brought about by the contamination will be directly into the system. Therefore, it is recommended that designers or users in the selection of filtration accuracy, the use of circulation filtration to control the system cleanliness, that is, circulation filtration accuracy is higher than the pressure filtration accuracy.
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