Used Piston Compressors for Sale — 58

Compressors are work absorbing devices which are used for increasing pressure of fluid at the expense or work done on fluid. A reciprocating compressor commonly referred to as a piston air compressor is a positive displacement machine in which the compressing and displacing element is a piston having a reciprocating motion within a cylinder. Reciprocating compressors are capable of giving large pressure ratios but the mass handling capacity is limited or small. Reciprocating piston compressors may also be single acting compressor or double acting compressor.  Single acting compressor has one delivery stroke per revolution while in double acting there are two delivery strokes per revolution of the crank shaft.

Construction and Working of Piston Compressor

The principal parts of a reciprocating piston compressor are: piston, cylinder, inlet valve, exit valve, connecting rod, crank, piston pin, crank pin and crank shaft. Inlet valve and exit valves used are of reed or plate type, which are either floating or clamped. Usually, backstops are provided to limit the valve displacement and may be of spring loaded type which get opened and closed due to pressure differential across them. The piston speed is decided by the valve type. When the compressor piston moves from the top to the bottom, suction pressure is created causing opening of inlet valve. With this opening of inlet valve and suction pressure the atmospheric air enters the cylinder. Air gets into cylinder during this stroke and is subsequently compressed in next stroke with both inlet valve and exit valve closed. This is the reason why both inlet and exit valves are of plate type and spring loaded so as to operate automatically as and when sufficient pressure difference is available to cause deflection in spring of the valve plates to open them. When the piston reaches the bottom, it reverses its motion and compresses the air inducted in previous stroke. if you are in need of an air compressor for sale or a used piston compressor all these factors must come in consideration. knowing how a machine works makes buying more easy. 

Compression is continued till the pressure of air inside becomes sufficient to cause deflection in exit valve. At this moment when exit valve plate gets lifted the exhaust of compressed air takes place and the piston gets back to the top position. Suction, compression and discharge are the three prominent processes getting completed in two strokes of piston or one revolution of crank shaft in the reciprocating compressor discussed here.

Application

Piston compressors are invariably used for all applications requiring high pressure air and they are one of the most widely used compressors for construction machinery. Some of the popular applications of piston air compressors are for driving pneumatic tools and air operated equipments, spray painting, compressed air engine, supercharging surface cleaning, refrigeration and air conditioning, chemical industry etc.