There are three main types of air compressors. Which you need will depend on the air pressure you need and how portable your compressor needs to be.
Reciprocating compressors come in a range from 5 HP to 1000 HP. The smaller compressors are portable, sometimes being mounted on wheels. These may be petrol driven or electrically powered. They compress air by a series of pistons in cylinders. The pistons are driven by a camshaft. Reciprocating compressors are often used in Auto Body Repair shops.
Larger reciprocating compressors are gradually being replaced by simpler rotary screw compressors. A large reciprocating compressor can discharge air at 35 Mpa, more than 5,000 psi.
If you are looking for a compressor for continuous use a rotary screw compressor may be suitable. These compressors use helical screws to compress the gas into a smaller volume. Portable and fixed rotary screw compressors are available. These compressors vary in size from 5 HP to 500 HP. You will find rotary screw compressors that give you a low pressure gas output, or a high pressure output, up to 8 Mpa. These compressors are used to power pneumatic drills when workers are digging up...
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