Patent ID: 7637280

Claim:
An onboard system for delivering respiratory gas to a mask connected to a user fluid circuit, comprising: a) a user fluid circuit connected to a mask; b) a valve body comprising at least first, second, third, and fourth internal zones, wherein: said first zone is connected to said user fluid circuit; said second zone is connectable to a first pressurized fluid source; said third zone is connectable to a second pressurized fluid source; said fourth zone is connectable to a vent circuit; and said first and said second pressurized fluid sources supply said user fluid circuit sequentially c) at least four fluid passages, wherein each said fluid passage connects a corresponding one of said zones to an external fluid circuit, one of the external fluid circuit being said user fluid circuit; and d) a mobile structure, wherein: 1) said mobile structure can be moved into at least four positions; 2) depending upon said movement of said mobile structure: fluid communication is established between at least two of said zones; at least two other of said zones are isolated from each other; and said first zone is selectively brought into communication with at least one other of said zone; 3) said mobile structure comprises a slide sliding on partition walls; and 4) said partition walls define said zones.