Selection of precision purification filters

What is the basis for the grade standard classification of filter elements?

Answer: According to the ISO 8573.1 quality grade, the grade achieved by the filter to deal with the compressed air. Generally, it is divided according to the size of solid pollutant particles, the content of liquid water, and the content of oil droplets, oil mist, and oil vapor after the filter element is processed.

How are the filter levels specifically divided?

Answer: The grades of general filters can be divided into pre-filter, primary filter, fine filter and activated carbon filter. Among them, the pre-filter generally filters out particles with a diameter of 3-5 μm, the primary filter generally filters out particles with a diameter of 0.5-1 μm and the residual oil mist content of 1 ppm w/w, and the fine filter generally filters out particles with a diameter of 0.01 μm and residual oil mist Content 0.0lppm w/w. The activated carbon filter is mainly used to remove odor and oil vapor (the remaining content of oil mist is only 0.003ppm w/w).

What are the applicable occasions of different grades of filters?

Answer: The pre-filter is generally used in the downstream of the compressor (after cooler), and the requirements for the application are not high. Primary filters are generally used for tools, motors, cylinders, etc. Fine filters are generally used in painting, injection molding, instruments, control valves, transmission, stirring, electronic component manufacturing, nitrogen separation, etc. Activated carbon filters are generally used in food and pharmaceutical manufacturing, breathing air, gas processing, etc.

Why should filters be purchased together?

Answer: The misunderstanding of most people is that they think that choosing a single filter corresponding to the processing precision according to the required air quality can meet the requirements and save money. In fact, the required air quality is determined by the processing accuracy of the selected single filter, but without the pretreatment protection of the pre-lower filter, the high-precision filter element will soon be blocked due to excessive load. The replacement frequency of the filter element is accelerated, which will increase the production cost in a disguised form.

Can filters lower the air dew point?

Answer: Filters generally only remove solid and liquid particles (drops), while water vapor and oil vapor can pass through the tortuous path of the filter material without hindrance. Therefore, mechanical filters cannot filter it out (except activated carbon filters). To fundamentally remove water vapor and oil vapor, only use a dryer to lower the dew point temperature of the air.

What is the relationship between filter efficiency and air temperature?

Answer: The temperature of the oil and water contained in the compressed air affects the filter efficiency. For example: when the temperature is 30°C, the oil content flowing through the filter is 5 times that at 20°C; when the temperature rises to 40°C, the oil content flowing through the filter is 10 times that at 20°C. Therefore, the filter is generally installed at the lowest temperature point of the compressed air system.

What is the gap between domestic filter elements and imported filter elements?

Answer: Due to raw materials, equipment and other reasons, domestic filter elements have always lagged behind imported filter elements in terms of filter materials and processing technology. The backwardness of detection methods and equipment makes it impossible to improve the quality of domestic filter elements due to lack of quantitative authoritative analysis. Compared with imported filter elements, domestic filter elements are generally rougher and bulkier.

What are the filter options?

Answer: The optional parts of the filter generally include: internal automatic drain, external automatic drain, differential pressure gauge, differential pressure gauge, electronic differential pressure indicator and liquid level indicator.

What are the filter options used for?

Answer: The internal automatic drainer and external automatic drainer in the optional filter are used to automatically discharge the mixture of oil, water and dust filtered by the filter element out of the filter, reducing the impact of human factors on the filtration efficiency of the system. Differential pressure gauges, differential pressure gauges, and electronic differential pressure indicators are used to guide the time to replace filter elements. The liquid level indicator is used to indicate the amount of mixed pollutants such as oil, water, dust, etc. inside the filter (it can monitor the working condition of the internal automatic drain and guide manual draining).

Lingyu ~ 1.0 0.01 micron precision moisture removal compressed air filter