This is the 3 way pilot safety valve, it works with the door locking mechanism on a Sechrist chamber.
This valve is responsible for allowing the chamber to turn on when door is closed. A bad valve will not allow the chamber to turn on. A bad valve could also allow the chamber to operate with the door in the open position ,cam not locked, or fully closed.
Call our service dept for more info: 707-500-BARO Ext104