Quote Originally Posted by Gary View Post
In a multi-stage system, the compressor cylinders are in series. The vapor is pumped by half of the cylinders, the discharge of which is then pumped by the other half of the cylinders. It is far more complex than this, but essentially that's how it works.
It's mostly in an uneven proportion: 4 cilinders HS and 1 LS or 6/2. Mostly an interstage cooler between LP and HP to avoid high discharge temperatures.
Ank_Gl, regrading your last post, 1 is wrong only one cycle, 2 is correct and 3 is also correct