[MailMan]

If you still want to recycle the air, I think the best way to do it would be to use the normal setup (compressor-air tank-regulator-solenoid-cylinder) then on the SMC solenoids they have exhaust ports from the cylinder, then put in a expansion tank such as the KOP air tanks, then you would have to somehow attach a hose fitting to the compressor’s air intake. The reason you would use the expansion tank is because the rate at which the air is coming out of the cylinder is greater than the rate at which the compressor is pumping.

This setup MAY let you pump air faster since the air is coming into the compressor pre-compressed. However, this would also take away power from your cylinders (thus requiring more air the extend the cylinder) making the entire effort pointless, and it would be a lot of work to mount the fittings on the compressor, let alone if it would pass Tech.