In an overheated Rankine cycle, the end point of the adiabatic expansion could end inside the dual-phase bell, or on the right.
In the first case, the end expansion point falls of course on the isothermobaric curve at the saturation pressure of the work fluid at the lower temperature Tlow of the cycle (usually room temperature), where it will be condensed into the condenser, as water has already started to appear.
But in the second case, the expansion stops at a temperature Tx greater than Tlow seen in the previous case, but at the very same pressure. Why? I mean, how the work fluid knows it has to stop at that pressure? Why it does not expand until its temperature reaches Tlow, at a lower pressure - from where the fluid should be isothermally compressed until it reaches the upper limit curve , where it can start to condense to get back to start conditions?
Sorry if the question may be stupid, but I need to study, after many years far away from thermodynamics, the Rankine cycle. Please be patient.