Hydraulic Driven Air Compressor

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Positive displacement compressors draw atmospheric air into one or more compression chambers. These chambers are then closed from the inlet. As the volume of each chamber decreases, the air is compressed internally until the pressure reaches the designed pressure ratio. The valve then opens and the air is discharged into the outlet system.

Reciprocating compressors are the most commonly used positive displacement compressors because they can handle all volume capacities and pressures. There are two different designs; single and two-stage.
Single-stage: With a single-stage, the air is drawn into the cylinder and compressed in a single stroke. Compressed gas is then transferred to a storage tank
Two-stage: A two-stage design employs an extra piston and is capable of higher pressure levels.

Rotary compressors are positive displacement machines in which the compressing and displacement are affected by the positive action of rotating elements. The two main types are vane and screw compressors.

Vane compressors use rotating, fan-like blades called vanes to compress hydraulic materials. The size and shape of the vanes determine how strong the pressure can be. Multiple vanes are combined to make complex compressors of any size.
Screw compressors are positive displacement machines that have distinct working phases: suction, compression and discharge. Two counter-rotating helical screws are arranged in a compressor casing; gas inlet and discharge nozzles are at opposite ends.

Dynamic compressors work at a constant pressure but their performance is affected by external conditions, such as changes in inlet temperatures. Air is drawn between the blades on a rapidly rotating compression impeller as it accelerates to a high velocity. The gas is then discharged through a diffuser, where the kinetic energy is transformed into static pressure. These compressors are designed for large-volume flow rates. Depending on the main direction of the gas flow, they are called radial or axial compressors.

Axial flow compressors use multiple vanes to increase the compression capabilities of a machine. They are often used in high-volume situations where a single rotary vane is not sufficient. They have a high-efficiency rate but are more expensive than other types of compressors.
Centrifugal compressors slow and cool incoming air through a diffuser in order to build up potential energy. Because of their multi-phase compression process, they're able to produce a high amount of energy in a relatively small machine. They require less maintenance than reciprocating compressors and some types can produce oil-free air.