I have a drainage pump station with vertical pumps and wanted your commentary on the placement of Air Release/Vacuum Valves. I have added a quick sketch to better illustrate the situation. Will the air release valve by the pump allow air in as flow goes through the drop? The discharge has variable conditions: 1) open discharge and 2) discharge when TW is at ~El. 7. I'm concerned about the head especially when the discharge end is open to atmosphere; will the FM be pressurized?. Any comments are greatly appreciated.