22/07/20

What is the difference between a pre-filter and a post-filter of an air compressor?


The development of industrial industry has greatly improved many products in life. The post-processing equipment of the screw air compressor is mainly composed of an air storage tank, a dryer and a filter. In the filtration part, it is divided into a pre-filter and a post-filter, which are generally separated by a dryer.

The development of industrial industry has greatly improved many products in life. The post-processing equipment of the screw air compressor is mainly composed of an air storage tank, a dryer and a filter. In the filtration part, it is divided into a pre-filter and a post-filter, which are generally separated by a dryer. The compressed air is discharged from the unit to the air storage tank, pre-filter, dryer, and post-filter to complete purification treatment such as filtration and drying. The same is a filter, so what is the difference between a pre-filter and a post-filter? The main difference is the accuracy of the filtering. Here is the detailed explanation:

Air compressor

1. Pre-filter: remove part of liquid water, lubricating oil and particles larger than 1μm in diameter. Whether it is an adsorption dryer or a refrigeration dryer, a pre-filter is required. Otherwise, once the rust and other particles on the pipeline are used in the evaporator, it will greatly reduce the working efficiency of the refrigeration dryer and even damage the evaporator.

2. Post filter: remove the oil mist concentration in the compressed air to a higher standard, while removing particles larger than 0.01μm and oil content larger than 0.001ppm. Under normal conditions, the post filter discharges almost no liquid water. If so, the air-water separator or drain valve inside the dryer is faulty.

3. The pre-filter can initially filter and purify the compressed air, and can filter out a large amount of water, oil and larger particles, and at the same time play a protective role. Therefore, the pre-filter of the air compressor is to pre-process the compressed air, perform preliminary filtration, and filter out relatively large particles.

4. The post filter is more precise. When the compressed air enters the aftertreatment stage, substantially no liquid is discharged. If compressed air containing a lot of impurities is not protected by the pre-filter, it is supplied directly by the post-filter. During transportation, the gas-water separator and drain valve may be blocked or even damaged.

This article introduces the difference between pre-filter and post-filter of air compressor. Hope it helps you! If you need to know more about air compressors, please pay more attention to our website! Our company is mainly engaged in the sales of air compressors and accessories, hardware tools, pneumatic tools and electric tools. Friends who need to buy related products, welcome to contact us!


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