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How to select a vacuum oil filter for treating industrial lubricants? The selection of a vacuum oil filter is crucial; different products are designed for various types of oils to enable targeted oil treatment. The viscosity of oils and the requirements for their parameters vary, which means that the design requirements for oil filters are also higher. A single type of oil filter cannot achieve all the purification goals required for different oils; such a thing is nothing but a fantasy! I. Lubricant Vacuum Oil Filter 1. Purpose of the lubricant vacuum oil filter: The TY-R series of lubricant vacuum oil filters were developed specifically for various types of lubricants. They are multi-functional filters designed to handle complex oil formulations, and are widely used for lubricants, hydraulic oils, anti-wear hydraulic oils, compressor oils, heat transfer oils, heavy-duty gear oils, refrigeration oils, etc. These filters can quickly remove impurities, water, gases from the oil, as well as light hydrocarbons, acid value, ammonia, etc., thereby improving the quality of the oil and restoring its original properties. II. Coalescing Oil Filters 1. Applications of coalescing oil filters ● Suitable for the purification of lubricating oils, turbine oils, fire-resistant oils, hydraulic oils, diesel, kerosene, and other types of oils. ●To remove water and impurities from the oil, filtering during refilling significantly improves the cleanliness of the system. 2. Technical principle of coalescing oil filters 3.1 No heating required for water removal ； Different liquids have different surface tensions; the lower the surface tension when a liquid flows through a small pore, the faster it will flow. When different mixed liquids enter a coalescing separator, they first pass through the coalescing filter element, which consists of multiple layers of filtering media with pore sizes that increase progressively from layer to layer. III. Pressure-type oil filters 1. Plate-and-frame oil filters: These filters use filter plates and frames to compress the filter paper and achieve a sealed filtering process; the efficiency of this method depends mainly on the precision of the filter paper. Currently, filter papers available on the market have precisions ranging from 5 to 200 u. The advantage is that the cost of such filter papers is low, and they are suitable for situations with a high amount of impurities, resulting in lower costs for replacement parts over time. However, the downside is that their operation is complex and their efficiency is low; since they are made of paper, they cannot remove large amounts of water and can only filter out large particles of impurities. Currently, there are many large plate and frame machines available on the market, and they have a wide range of applications. 2. The oil filtering cart uses a pump to transfer the oil, and then multiple sets of filters are used to remove impurities. The filter elements available include stainless steel, paper, and PH cotton; the precision level can be adjusted according to the customer’s requirements regarding the oil. These filters cannot remove water, and they are generally used for filling or pumping oil. They have a high flow rate, and their main function is to filter out impurities during the oil filling process. The price is relatively cheap. 3. High-precision oil filters: Such filters place high demands on the filtration elements, with the key technology lying in the design of these elements. There are many such filters available on the market, but the quality varies greatly – some claim to be high-precision despite not actually meeting that standard. In theory, a high-precision oil filter should be able to achieve a particle size level of NAS7 or higher after just one filtration step. Currently, few manufacturers in China can achieve this level, while many foreign companies can, such as PALL, HEDGECO, Seiko, and 3R. Different technologies are used, including membrane filtration and deep filtration; for example, hydraulic oil can often be made transparent after just one filtration step, with even the smallest particles removed. Visually, transparency is the primary indicator of high precision – if the oil isn’t transparent after filtration, it cannot be considered high-precision. Many filters on the market claim to be high-precision, but they are relatively large in size and have a flow rate of only a few dozen liters per minute – this is nothing but deception. It’s a basic principle that the higher the precision of a pressure-based filtration system, the lower its flow rate. IV. Centrifugal oil filter: It uses centrifugal force to separate oil, water, and impurities based on their different densities, enabling both solid-liquid separation and liquid-liquid separation. There are three types of separation: solid-liquid-liquid separation. Based on different rotation speeds, centrifuges can be divided into low-speed and high-speed centrifuges. Low-speed centrifuges are mainly used for handling extremely dirty oils in the fastener industry, oils used in metal processing, and drawing oils.