Patent ID: 6669758
Filing Date: 2003-12-30
Classification: A62B,B01D

Abstract:
A molecular sieve gas concentration controller system for controlling a molecular sieve device separating a selected gas from an input gas supply, the apparatus comprising:n gas concentrating molecular sieve beds; a valve assembly having at least n different states, where n is at least 2; the valve further having: an input for receiving the input gas supply and at least n outlets; in each state of the valve assembly, the valve creates an open passageway permitting for flow of gas from the input of the valve to at least one different outlet; and from a second outlet to a vent; the valve having a first position having an open passageway from the input to a selected outlet, and a second position having a blockage between the input to the selected outlet; and, transitioning the valve from the first to the second position creates a variable amount of restriction in the flow of gas between the input and the selected outlet; and from second outlet to the exhaust; an input connection for each of the n sieve beds in gas flow communication with an outlet of the valve; movement means for controllably moving the valve assembly for one state to another; and, control means operably connected to the movement means for varying the restriction in a selected open passageway in the valve assembly; whereby a mass flow restriction is created between the inlet or outlet and the sieve beds reducing performance of the molecular sieve beds below optimum levels.