First, we should consider the exhaust pressure and the volume of the exhaust.
Based on the national regular, the exhaust pressure of general purpose air flow compressor is 0.7 MPa (7 atmospheric pressure) and the old standard is 0.8 MPa (8 atmospheric pressure). Because the design operating pressure of pneumatic equipment and wind machinery can be 0.4 Mpa, the working pressure of air flow compressor can fully meet the requirements. If the air flow compressor used by the consumer is bigger than 0.8MPa, it should be specially manufactured. The technique of forced pressurization can't be adopted in order to avoid accidents.
The size of the exhaust is also one of the main parameters of the air compressor. Choosing the air volume of the atmosphere compressor should match its exhaust quantity and leave a 10% margin. If the air flow volume is large and the air compressor exhaust quantity is small, when the pneumatic tools start, the exhaust pressure of the air flow compressor will be greatly reduced, but the pneumatic tools can't be driven. Of training course, it is also wrong to pursue huge exhaust capacity blindly, since the larger the exhaust capability, the larger the motor allocated by the surroundings compressor, not only the higher the purchase price, but also a waste of purchasing funds, and the usage of energy and energy will be wasted.
Consider the mixture of gas fields and conditions.
If the utilization of air space is narrow, it must be vertical; when there is a long-distance transformation in the usage of air (more than 500 m), mobile type is highly recommended; if the utilization of electricity can't be used, diesel engine driving type ought to be selected; when there is no circulating drinking water in the use of occasions, air-cooled type should be selected. In the air-cooled and water-cooled cooling modes, many users have a wrong idea that water-cooled is good, but in fact it is not. The air-cooled type accounts for more than 90% of the small compressors in the home and abroad. This is because the air-cooled type is easy in design and no water source is needed in use. There are four fatal shortcomings of water-cooled compressor: it will need to have a complete upper and lower water program with large expenditure; water-cooled cooler has short life; it is easy to freeze the cylinder in winter season in the north; it will waste a lot of water in regular operation.
After that consider the compressed air quality.
Generally, compressed air produced by air compressor contains a certain amount of lubricating oil and water. In some instances, it really is prohibited from oil and water. At the moment, attention should be paid not merely to the selection of compressor, but also to the addition of auxiliary products when necessary.
Lastly, it really is to expand the knowledge of reference.
1. Stability: With the strong rise of China's overall economy and the continuous emancipation of the thoughts of all types of manufacturers, manufacturers from coast to coast are busy with creation work. Along the way of production, air compressors, which play an essential role, are often fully loaded and operate all-weather. In the entire production of factories, surroundings compressor gas production is unstable, which is an extremely troublesome thing, often will bring incalculable losses. Therefore, whenever we purchase air compressors, the initial criterion may be the stability of air compressors. At present, some high-end brands both at home and overseas can meet this necessity. With the mature technology of adjustable frequency atmosphere compressor, it could be said to meet this requirement.
2. Gas production: The second is gas production. Some enterprises possess very high quality of gas. For instance, in the pharmaceutical market, basically the gas they need is oil-free of charge. In this regard, it is still predicated on the enterprise's own situation. If the business includes a high demand because of this, then it's been a long period to buy more well-known devices. If the demand 
is not high, it depends upon other situations. As the future development pattern of the atmosphere compressor industry, the variable frequency air compressor is still very exceptional in gas production, because the variable frequency atmosphere compressor has a prominent characteristic of tracking gas creation, and at the same time the gas quality created is very considerable.
3. Power consumption: That is a 
comparatively important place as well as the focus of conversation, because atmosphere compressor, as a basic equipment, is generally operated all-weather, and air compressor itself is a very power-consuming equipment, the overall manufacturer of surroundings compressor power consumption accounts for 20-30% of the total plant power usage. If effective control, the result is very Oil less Air Compressor apparent. Many domestic enterprises are now pursuing the base price. In fact, underneath price is rather one-sided. For general creation enterprises, the purchase price of air compressor only makes up about 5% of the full total cost of surroundings compressor, 9% of the maintenance and labor costs, and 86% of the full total cost of electricity. Therefore, considering the last expenditure, the frequency transformation air compressor should be much lower than the ordinary atmosphere compressor. Frequency conversion atmosphere compressor is the first expenditure, but if you take the electricity price into account, you can really calculate a bill. Today, the general energy-saving amount of frequency converter surroundings compressor is quite objective, and the domestic professional frequency converter surroundings compressor, its power-saving price is as high as 30%, usually within a 12 months can recover the difference. Therefore, whenever choosing air compressor, choosing an excellent variable frequency atmosphere compressor is really the best remedy to the problem of power consumption.