W 3 S E R I E S
H I G H P R E S S U R E A I R C O M P R E S S O R
©ALKIN COMPRESSORS
12
2.3 P&I (Process & Instrument) Diagram
The following process and instrument diagrams are prepared with the drawing of the physical components rather
than pneumatic symbols, in order to facilitate the understanding of the system by users who are not specifically trained
to understand pneumatic symbols.
2.3 Principles of Operation
P&I diagram have to be reviewed carefully to understand the principle of the operation.
Air at atmospheric pressure is drawn through the inlet filter into the 1st stage cylinder on the down-stroke of the
piston. The up-stroke motion of the piston will cause compression and the air will be forced out of the cylinder
through 1st stage discharge valve. Air will then pass through the intercooler tubes between the 1st and 2nd stages and
goes into the 2nd stage compression chamber. Here, the air is compressed to the 2nd stage compression level and
forced through the 2nd stage 2nd stage inter 2nd stage water sep 3rd stage inlet valve into
the 3rd stage cylinder. Here, the air is compressed to the final pressure level and forced out to the aftercooler then
passing through a check valve enters the purifier chamber, where it is purified and prepared to be used for breathing
purposes. For certain W3 Canopy models, it enters first to the prefilter and then goes to purifier through a check
valve.
For certain W3 Canopy models with a working pressure of minimum 180 bars, a priority (or minimum pressure valve)
is installed downstream the purifier. This valve prevents the air from exiting the purifier until the pressure builts to
approximately 180 bars (2610 psi), a pressure level where the purification process is more efficient than at lower
pressures. The air is than ready to be directed to a filling panel and with proper connections to the cylinders to be
filled.
Summary of Contents for W3 Series
Page 1: ...W3 SERIES HIGH PRESSURE AIR COMPRESSORS...
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Page 10: ...W 3 S E R I E S H I G H P R E S S U R E A I R C O M P R E S S O R ALKIN COMPRESSORS 5...
Page 14: ...W 3 S E R I E S H I G H P R E S S U R E A I R C O M P R E S S O R ALKIN COMPRESSORS 9...
Page 26: ...W 3 S E R I E S H I G H P R E S S U R E A I R C O M P R E S S O R ALKIN COMPRESSORS 21...
Page 30: ...W 3 S E R I E S H I G H P R E S S U R E A I R C O M P R E S S O R ALKIN COMPRESSORS 25...
