Rotary 2 stager with metal case and some extras

[Clemmaster]

The discharge pressure has to do with pressure drop through both succion and discharge valves too, and it depends mainly of the viscosity of the entering refrigerent, that's maybe the difference between gases discharge temperature.

Tom, R22 is the first stage gas that involve the highest discharge temperature, even hoter than R410a do in the same conditions, that's why, as I've already said, in industry some systems have to put forced liquid return into the compressor, by evaporation of the R22 directly in the succion line, near the succion connector because of the too high discharge temperature and the compressor that reach its maximal temperature.