Stationary multi-phase sampling collection with automatic cleaning and minimum waste

A method of collecting a sample from a non-homogenous fluid that is flowing through a pipeline comprising steps of:

• delivering the non-homogenous fluid to a three-way four-port valve unit that comprises:
• a valve housing and an inner valve member that is movably disposed within the valve housing between a plurality of positions, the inner valve member having a main valve body that has a first valve opening, a second valve opening opposite the first valve opening, a third valve opening and a fourth valve opening opposite the third valve opening;
• wherein the non-homogenous fluid flows into the third valve opening which is defined by a plurality of orifices that cause mixing of the non-homogenous fluid to generate a mixed homogenous fluid and the fourth valve opening has a lesser diameter that the third valve opening for increasing fluid pressure drop, fluid velocity, and fluid turbulence resulting in improved mixing of the non-homogenous fluid that exits through the fourth valve opening;
• taking a sample of the mixed homogeneous fluid;
• and
• reinjecting sampling waste back into the pipeline.