Tips for purchasing return oil filters

pageview:14 2023.10.12

        When purchasing a hydraulic return oil filter, we only consider its service life and believe that the one with a long service life is good. Then, we judge its advantages and disadvantages based on the speed of filter blockage. In fact, these methods are relatively one-sided. Because the filtration performance of the return oil filter is mainly reflected by performance indicators such as filtration ratio, contaminant capacity, and original pressure loss, the longer the service life is, the better it is only under the same working conditions and the cleanliness requirements of the hydraulic system must be ensured.
        We all know that solid pollution in hydraulic systems is the main factor causing hydraulic system failures, so we choose high-precision filters to control pollution. It should be noted that this does not bring much benefits, but also increases the manufacturing cost of the system and shortens the service life of the filter element.
        Many people believe that the bypass valve of the hydraulic return oil filter and the safety valve of the system have the same function: after the filter element is blocked, the bypass valve opens, and the system oil flows through at full flow, which has no impact on the system. In fact, this is an incorrect understanding. When the bypass valve of the hydraulic filter is opened, pollutants blocked by the filter element (filtered pollution particles) will re-enter the system through the bypass valve. At this time, the concentration of local oil pollution is high, causing great damage to the hydraulic components, and the previous pollution control has lost its meaning.
What are the misconceptions in selecting a return oil filter?
        When the oil viscosity is 32CST, the rated flow rate of the return oil filter is the flow rate to clean the filter element at the specified original resistance. However, in practical applications, the viscosity of the oil can change at any time due to the temperature of the medium and system. If it is selected based on the rated flow rate and actual flow rate of 1:1, when the viscosity of the system oil is high, the resistance of the oil passing through the equipment will increase, and the filter element will be blocked.
         Secondly, the filter element of the filter is a part that is prone to contamination and gradually becomes contaminated during operation. The actual effective filtering area of the filtering material is decreasing, and the transmission rate of the anti pollution transmitter is quickly reached through the resistance of the oil. This requires frequent cleaning or replacement of the filter element, which increases the user's usage cost.
         The above are some tips shared by Dongfeng Filter manufacturer with you regarding the purchase of return oil filters. We hope they can be helpful for you when using hydraulic filters. If you have any questions about filters or filter elements, please feel free to contact us. We are available 24/7 and look forward to hearing from you!!!