There are generally three types of lubrication systems in reciprocating compressors. This unit is driven from a reciprocating or rotary part of the compressor.
Oil is fed from the cylinder lubricator by separate lines to each cylinder.
A check valve at the end of each feedline keeps the compressed air from forcing the oil back into the lubricator. Each feedline has a sight-glass oil flow indicator. Lubrication begins automatically as the compressor starts up. Figure 14-7 shows the lubrication connections for the cylinders. The correct type is vital to the operation and reliability of the compressor.