The influence of pressure and temperature on the phase behavior of the systems H2O + C4E1 + C-8 and H2O + C4E2 + C-8 is investigated. At constant pressure and increasing temperature, a (2) under bar --> 3 --> (2) over bar type phase behavior was observed for both the systems, while at constant temperature and increasing pressure, a (2) over bar --> 3 --> (2) under bar type phase behavior was found. The systems H2O + C4E1 + C-10, H2O + C4E1 + C-8 and H2O + C7E5 + C-12 are modeled with the SAFT HS equation of state. Although the model gives qualitatively the correct phase behavior, the quantitative match with the experimental data is found to be unsatisfactory.