Originally Posted by
billnuke1
Exactly what operation would that be? Opening and/or closing large valves...
Two spring loaded valves internal to the compressor are actuated by diaphragms in two housings with pushrods attached.
At rest the compressor inlet is isolated from the low pressure (100 psi) supply air system that feeds the compressor, this is the load control diaphragm in the repaired housing.
The second diaphragm controls a valve that opens a port to a exhaust manifold, this is the unloader diaphragm in its own housing.
This is the ready state for compressor start up. As the compressor comes up to speed (400 rpm) the pressure on the diaphragms is released and air is compressed and discharged through a check valve.
The high pressure air system receiver tanks are maintained at roughly 400 psi.
This is what C&V looks like.
20210204_133741_HDR by
nemosengineer, on Flickr
: Mike