A splitter with prescribed mass-flow split, that changes (increases or reduces) pressure on outletA in order to fulfull the mass-flow prescription. In case an increase of pressure is necessary for the mass-flow (or for reversed mass-flow), the component will create work in the form of increasing pressure on the A-path.
For SplitterRatio and JunctionRatio make sure to only prescribe mass-flow-split in Splitter or Junction.