Usually, after the thermostatic expansion valve, the R134a will change from single liquid state into two phase.

Firstly, I want to know: which should be more? liquid or vapor? after TXV. In my opinion, liquid should be much more than vapor. But I found the portion of liquid is very small (18%) after TXV, using rotor meter for flow rate measurement.

I heard about there is more vapor than liquid after using commercial TXV, because people want that there is only vapor after evaporator. In this case, compressor could work under dry and good condition.
Is it true?

If that is true, what should I do in order to increase the portion of the liquid?

Thanks a lot!