Valve Operation and Air Flow: Notes
As in the X parts below, there are the area with atmospheric air pressure above the diaphragm and the area with tank pressure below the diaphragm. Also, as in the Y parts below, there are the area with tank pressure above the diaphragm and the area with canister pressure below the diaphragm. In the table below the air flow from each port in accordance with pressure difference is shown with the atmospheric air pressure port A, tank pressure port B and canister pressure port C.
PRESSURE STATUS
| Pressure Status | Flow |
|---|---|
| A < B (Solenoid OFF) | B --> C |
| B < C (Solenoid OFF) | C --> B |
| Solenoid ON | B <--> C |