The pressure is equal in both tanks and the cut in pressure for each compressor is controlled by a pressure switch on each compressor. Best to have them set at different pressures so less starting load on the electric system supplying the electricity. No check valve is required.A one way check valve should be installed on the compressors
Ideally the cut in pressure will be adjusted so they are both as equal as possible though one will always be the master and one the slave.
The one way check valve ensures that the master (the one that cuts in first) is not pressurising the slave, the slave will then cut in when the pressure reduces.
So no not nonsense at all.
Hi thanks I’m aware of how they work, my mate has a check valve on his as he’s got both a 10 bar 3hp compressor (the larger one) and a smaller 2.5 hp unit which runs on 8 bar, both taking the supply directly from the tank, not the regulators with a check valve fitted to the 8 bar unit to stop it from being over pressured. Probably not the best of setups but it seems to work.The pressure is equal in both tanks and the cut in pressure for each compressor is controlled by a pressure switch on each compressor. Best to have them set at different pressures so less starting load on the electric system supplying the electricity. No check valve is required.