Thermal Vacuum Valve: Testing and Inspection

Fig. 30 EGR/EFE/EMR Thermal Vacuum Switch:

Below the switching point, Ports 1 and 2 and 3 and 6 should be connected, while Ports 4 and 5 should be sealed, Fig. 30.
Above the switching point, Port 1 should be connected to Port 5, Port 2 should be connected to Port 6, and Port 3 should be connected to Port 4.