What is a precision filter? What are the common filter elements?

Precision filters (also known as safety filters) typically have a housing made of stainless steel. Inside, tubular filter elements such as PP melt-blown filters, sintered wire filters, pleated filters, titanium filters, and activated carbon filters are used as filtering components. Different filter elements are selected based on the type of filtration medium and the design requirements, in order to meet the desired water quality standards. With the continuous development of the filtration industry, more and more industries and enterprises are adopting precision filters, and an increasing number of companies are entering this sector. Features of the folding structure: Top cotton filtration for various coating equipment, as well as frame-type and bag-type filters; suitable for use in the fine chemicals, petroleum products, food and pharmaceuticals, water treatment, and other industries. Foldable performance features: (1) High filtration precision with uniform pore sizes in the filter elements; (2) Low filtration resistance, high flow rate, strong dirt-trapping capacity, and long service life. (3) The filter element material has a high level of cleanliness and does not contaminate the filtering medium. (4) Resistant to chemical solvents such as acids and alkalis. (5) High strength, heat-resistant; the filter element is not prone to deformation. (6) Low price, low operating costs, easy to clean, and the filter element is replaceable.

Basic parameters: 1. Filtration rate: T/H – 0.05–20. 2. Operating pressure of the filter: mpa – 0.1–0.6. 3. Number of elements in the filter: 1, 3, 5, 7, 9, 11, 13, 15. 4. Operating temperature of the filter: °C – 5–55. Features and applications of various filter elements: PTFE membrane filters, HE membrane filters, PP membrane filters, CN-CA fiber membrane filters. The filtration precision ranges from 0.1–60 um, and the lengths are available in 10, 20, 30, and 40 inches (i.e., 250, 500, 750, 1000 mm). These filter elements can withstand a pressure of 0.42 mpa and are capable of backwashing. The interface types include plug-in types (two versions with 222 and 226 connections) and flat-mouth types. Features of the foldable filter: it is small in size, light in weight, easy to use, has a large filtering area, a low clogging rate, fast filtering speed, does not cause pollution, and exhibits good thermal and chemical stability. This filter can remove most particles, and thus is widely used in fine filtration and sterilization processes. The filter cartridge can contain 1-core, 3-core, 5-core, 7-core, 9-core, 11-core, 13-core, 15-core, etc. The lengths of the pleated filter elements are 10, 20, 30, and 40 inches. The materials used for the filter elements include polytetrafluoroethylene, polysulfone, nylon, polypropylene, and cellulose acetate. Available pore sizes include 0.1 µm, 0.22 µm, 1 µm, 3 µm, 5 µm, 10 µm, etc. There are also hydrophobic filters (suitable for gases) and hydrophilic filters (suitable for liquids); users can choose accordingly based on their needs. Precision filters mainly include: PA and PE microporous precision filters, titanium rod filters, polyethersulfone filter elements, polytetrafluoroethylene filter elements, and microporous membrane cartridge filters. Features of the foldable version: 1. Highly efficient at removing water, oil mist, and solid particles; it eliminates 100% of particles larger than 0.01μm, and keeps the oil mist concentration at 0.01ppm/wt. 2. It has a rational design, resulting in a small size and light weight. 3. An optional plastic casing with a protective cover or an aluminum alloy casing is available. ⒋Three-stage segmented purification treatment for a long service life.

Type: Foldable Q-grade precision filter. General application: Pre-filter for conventional reciprocating air compressors. Material: Multi-layer glass fiber filter element. Particles filtered out: 5 MICRON. Oil content filtered out: 5 PPM. Maximum pressure: 16 KG/CM. Maximum temperature: 65°C. Normal pressure drop: 0.2 KG/CM. Maximum pressure drop: 0.7 KG/CM. Function: Filters out large amounts of oil and gas in compressed air to levels of 5 PPM, as well as removing impurity particles down to 5 MICRON.

Precision filter. Foldable P-grade precision filter. General application: Pre-filter for conventional screw air compressors. Material: Multi-layer glass fiber filter element. Particles filtered out: 1 MICRON. Oil content filtered out: 0.5 PPM. Maximum pressure: 16 KG/CM. Maximum temperature: 65°C. Normal pressure drop: 0.17 KG/CM. Maximum pressure drop: 0.7 KG/CM. Function: Removes oil and gas from compressed air to levels of 0.5 PPM, and eliminates impurity particles down to below 1 MICRON.

Foldable S-grade precision filter. General application: Post-filter for conventional air compressors. Material: Multi-layer glass fiber filter element. Particles filtered out: 0.01 MICRON. Oil content filtered out: 0.01 PPM. Maximum pressure: 16 KG/CM. Maximum temperature: 65°C. Normal pressure drop: 0.275 KG/CM. Maximum pressure drop: 0.7 KG/CM. Function: Precisely filters out trace amounts of oil and gas in compressed air to 0.01 PPM, while also removing impurity particles to 0.01 MICRON, thereby producing high-quality compressed air free of oil.

Foldable C-grade precision filter. General application: Designed for highly precise filtration. Material: Activated carbon filter element. Particles filtered out: 0.03 MICRON. Oil content filtered out: 0.003 PPM. Maximum pressure: 16 KG/CM. Maximum temperature: 65°C. Normal pressure drop: 0.75 KG/CM. Maximum pressure drop: 0.7 KG/CM. Function: Used primarily to remove ozone, extremely fine oil and gas particles, and ultra-fine particles from compressed air. To achieve high levels of precision in filtration, this precision filter utilizes multiple layers of different filtering materials, including borosilicate fiber layers, glass fiber layers, activated carbon fiber layers, multiple layers of non-woven fabric, and stainless steel mesh layers. Only in this way can high-quality air free of oil and impurities be achieved. Additional information: The main C-pipe filter is capable of removing a large amount of liquid as well as solid particles larger than 3μm, achieving a minimum residual oil content of only 5ppm; it also removes small amounts of moisture, dust, and oil mist. Used in air compressors, after the rear cooler and before other filters, for general protection; used before cold dryers as a pre-treatment device. The T air pipeline filter can remove liquid and solid particles as small as 1μm, achieving a minimum residual oil content of only 0.5ppm, along with trace amounts of moisture, dust, and oil mist. Used for pre-treatment before Class A filters; it further improves air quality after cold dryers and desiccators. A super-high-efficiency oil removal filter can remove liquid and solid particles as small as 0.01μm, achieving a residual oil level of only 0.001ppm; almost all moisture, dust, and oil are removed. It serves as a protective measure before H-class filtration and desiccant dryers; after the refrigerated dryer, it ensures that there is no oil in the air. The H activated carbon micro-oil mist filter can remove oil mist and hydrocarbons as small as 0.01μm, achieving a minimum residual oil level of only 0.003ppm; it contains no moisture, dust, or oil, and is odorless and tasteless. It serves as the final filtering stage for units that require high-quality air, such as the food industry, respiratory applications, and aseptic packaging.

Materials: 1. Housing: Stainless steel or PP. 2. Filter element material: Special eco-friendly fibers and non-woven fabrics for series B and C; activated carbon for series D and precision filters. Precision filters: Activated carbon

Maintenance and Repair 1. The core component of a precision filter is the filtering element, which is a part that is prone to damage and therefore requires special protection. 2. When a precision filter operates for an extended period of time, it will trap a certain amount of impurities, which reduces its operating efficiency; therefore, it needs to be cleaned regularly, including the filter elements as well. 3. During the cleaning process, special attention must be paid to cleaning the filter element, ensuring that it does not get deformed or damaged; otherwise, the filtering accuracy will decrease, failing to meet the production requirements. 4. If the filter element is found to be deformed or damaged, it must be replaced immediately. 5. Certain precision filters cannot be reused multiple times, such as bag filters and polypropylene filters

General principles: 1. Inlet and outlet diameters – In principle, the inlet and outlet diameters of the filter should not be smaller than those of the pump it is designed to work with; they are generally identical to the diameter of the inlet pipe. 2. Nominal pressure: The pressure rating of the filter shall be determined based on the maximum pressure that may occur in the filtration pipeline. 3. Selection of mesh size: This is primarily determined by the particle size of the impurities to be filtered out, and is based on the process requirements of the medium flow. For the particle sizes that can be intercepted by screens of various specifications, please refer to the table \"Screen Specifications\". 4. Filter material: The material of the filter is generally chosen to be the same as that of the process pipeline it is connected to. Depending on the operating conditions, filters made of cast iron, carbon steel, low-alloy steel, or stainless steel can be considered. 5. Calculation of filter pressure loss: For water filters, under normal operating conditions, the pressure loss is between 0.52 and 1.2 kPa. Scope of application: Precision filters are widely used in industries such as petrochemicals, natural gas, coatings, paints, inks, pharmaceuticals, bioengineering, automobile manufacturing, electronics, electroplating, food, and beverages; they represent ideal equipment for filtering, clarifying, and purifying various liquids. Petroleum and chemical industries: hydrogen peroxide, resins, lubricants, polymers, adhesives, aviation fuel and various oils, catalysts; purification of various fluids used in the production of chemical fibers; separation and recovery of chemical intermediates and other chemical products. Petroleum and natural gas industries: CNG filtration at gas stations, desulfurization using amine solutions and filtration of dehydration agents; separation and purification of natural gas and refinery products; water injection in oil fields, well repair, filtration of acidizing fluids. Coatings, paints, and inks industries: filtration of latex paints, paint raw materials, and solvents; printing inks, inkjet inks, and additives. Pharmaceutical and biotechnology industries: water used in the production of intravenous fluids (LVP and SVP), plasma and serum for biological products, various pharmaceutical intermediates, pharmaceutical raw materials, solvent filtration, CIP filtration, sterilization and filtration of air entering fermentation tanks and exhaust gases. Automotive manufacturing industry: electrophoretic paints, topcoats, ultrafiltered water, pre-treatment liquids, water used for spraying on vehicles, cooling fluids for engine cranks, industrial gases used in painting, and gas purification in painting booths. Electronics and electroplating industries: chemicals and treatment processes used in the manufacture of liquid crystal displays, lithography machines, optical discs, copper foil, integrated circuits, and other microelectronic and electronic products; electroplating solutions, purification of process gases, and filtration of gases in purification rooms. Food, beverage, and alcohol industries: purification and sterilization of processes involved in the production of wines, yellow rice wine, baijiu, beer, fruit wines, sake, fruit juices, tea beverages, soy milk, dairy products, bottled water, edible oils, vinegar, monosodium glutamate, and other food additives.

Precautions: 1. Filters should be configured according to the principle of “coarse first, then fine”; the order must not be reversed. Standard configuration for precision filters: 2. The flow rate, pressure, and temperature of the compressed air passing through the filter must not exceed the values specified on the nameplate. 3. During installation, care must be taken to distinguish between the inlet and outlet positions of the filter. 4. The filter should be installed vertically accordingly. Leave a certain height above the ground to facilitate the replacement of the filter element. 5. The filter element should be replaced when any of the following conditions occur: a) The filtering efficiency significantly declines; b) The pressure difference exceeds 0.07 MPa; (Note: Initial pressure drop of the filter element

Inlet pressure MPa: 0.15, 0.35, 0.5, 0.7, 0.9, 1.05; Coefficients: 0.25, 0.5, 0.75, 1, 1.24, 1.43

The precision filter element is the heart of the filter; as the name implies, it is the element itself. The main principle behind filter elements, and indeed filters in general, is to purify raw resources and enable their reuse; they are purification devices needed for this purpose. Filter elements are typically used in industries such as oil filtration, water filtration, and air filtration. By removing a small amount of impurities from the filtering medium, it is possible to ensure the proper operation of the equipment or maintain the cleanliness of the air. When the fluid passes through the filter elements with a certain level of precision, the impurities are trapped, while the clean fluid flows through the elements.

A filter that achieves a certain level of precision in filtration is called a precision filter. There are variations in the standards for such filters; some are made of engineering plastics while others are metal-based, and those made of metal can achieve a filtration precision of 50μm