@Newbomb Turk . This is a continuation of post #54. In this diagram representing an oil circuit being fed from two opposing ends. Where in the main oil gallery would oil stop flowing?
BTW. your assumption that the pressure from each feed is the same. It's not. Also consider the FACT that somewhere in that pipe there are two different columns of oil meeting. That point can move back and forth in the pipe as the local pressure changes. Pressure and no flow. It happens.