Attached is a zip file containing a PDF of extracted pages from the Marine Engineer Volume 32. It shows the control valve for the Schaffer & Budenberg Ash Ejector. The Ash Ejector iself is of similar design as the See's version. The control valve shows a switching position for the water to go to the EJECTOR and the oposite position to the SEA. The schematic on the following page shows the TO SEA connection being returned to the Pump Inlet/Suction pipe. This may be the case for a single unit, but I believe for multiple units in larger liners, they would have piped it similar to what is shown on the Olympic and Ceramic drawings.