What you have is the most overbuilt unloading mechanism ever put on a reciprocating compressor. The flyweights in the wheel move in and out due to rotation of the wheel, which actuates the unloader mechanism through the linkage. It"s really no loss if this system is unsalvageable, as it was often the cause of more problems than the solution. Weights would stick, linkages would fall apart, or bind up, and generally it was another source of trouble and maintenance. If you can make the unloader on the cylinder head air tight, and remove all the fussy linkages, flyweights and springs, you can put a common pressure switch and needle valve type unloader on your machine and rest easy ***unless** this is one of those Curtis compressors that uses the high pressure exhaust valve as the check valve. In that case, you would need to install an in-tank check valve first, then plumb the unloader line from the switch to the check valve port. You will need to buy some Swagelock fittings and maybe cut and bend a little bit of copper tubing for a new discharge line, but its an easy job.
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