Multi-rotor flow control valve

1. A system, comprising:

an internal combustion engine having a gaseous flow stream;

a rotary valve disposed in the gaseous flow stream, comprising:

a first rotor and a second rotor wherein the first rotor and the second rotor rotate simultaneously and in opposite directions;

wherein the rotors in a first position close the gaseous flow stream and in a second position comprise a maximum flow-through area; and

a stator coupled to the rotors, the stator having a flow-through area comprising the maximum flow-through area.

2. The system of claim 1 , wherein the maximum flow-through area comprises more than 50% of a total flow area of the gaseous flow stream.

3. The system of claim 1 , wherein the gaseous flow stream comprises a stream selected from: an exhaust gas recirculation (EGR), an EGR cooler bypass, a turbine bypass, a compressor bypass, an intercooler bypass, and an aftertreatment component bypass.

4. The system of claim 1 , further comprising a second stator, each of the stator and the second stator engaging a spacer, and the second stator having a second flow-through area comprising the maximum flow-through area.

5. The system of claim 4 , wherein each of the flow-through area and the second flow-through area correspond to the maximum flow-through area.

6. The system of claim 1 , further comprising a single actuator that moves both rotors.

7. The system of claim 1 , wherein the maximum flow-through area comprises more than 66% of a total flow area of the gaseous flow stream.

8. The system of claim 1 , further comprising a total of n rotors, wherein the maximum flow-through area comprises a fraction of a total flow area of the gaseous fluid stream, the fraction comprising a value between

(

1

-

n

n

+

1

)

⁢

⁢

and

⁢

⁢

(

1

-

n

-

1

n

)

.

9. The system of claim 8 , wherein n comprises a value between 3 and 6, inclusive.

10. The system of claim 1 , further comprising a total of n rotors, wherein the maximum flow-through area comprises a fraction of a total flow area of the gaseous fluid stream, the fraction comprising a value between

(

1

-

n

n

+

1

)

and 0.5.

11. An apparatus, comprising:

a rotary valve disposed in a gaseous flow stream, comprising:

a first rotor and a second rotor wherein the rotors in a first position close the gaseous flow stream and in a second position comprise a maximum flow-through area that is more than 50% of a total flow area of the gaseous flow stream; and

a stator coupled to the rotors, the stator having a flow-through area comprising the maximum flow-through area, wherein the first rotor and second rotor rotate simultaneously and in opposite directions.

12. The apparatus of claim 11 , further comprising a single actuator that engages both the first rotor and the second rotor.

13. An apparatus, comprising:

a rotary valve disposed in a gaseous flow stream, comprising:

a first rotor and a second rotor wherein the rotors in a first position close the gaseous flow stream and in a second position comprise a maximum flow-through area that is more than 50% of a total flow area of the gaseous flow stream; and

a stator coupled to the rotors, the stator having a flow-through area comprising the maximum flow-through area, wherein the first rotor and second rotor comprise a high temperature material, and wherein the stator comprises stainless steel.

14. The apparatus of claim 13 , wherein the gaseous flow stream comprises an engine related fluid conduit comprising a fluid conduit selected from the fluid conduits consisting of an exhaust fluid conduit, an EGR fluid conduit, and an EGR cooler bypass fluid conduit.

15. An article of manufacture, comprising:

a first rotor having a first flow-through area comprising more than 50% of a total first rotor flow area and further having a first ridged arc member;

a second rotor having a second flow-through area comprising more than 50% of a total second rotor flow area and further having a second ridged arc member;

an upstream stator and a downstream stator, each stator comprising a co-extensive stator flow-through area and a co-extensive structural area;

an actuator comprising an engagement gear, wherein the engagement gear disposed between the first ridged arc member and the second ridged arc member, wherein a turn of the engagement gear moves the first ridged arc member and the second ridged arc member in opposing directions; and

wherein the first rotor and second rotor are phased such that:

at a first position the first rotor and second rotor co-ordinate to cover the co-extensive stator flow-through area; and

at a second position of the engagement gear the first flow-through area and the second flow through area are co-extensive and comprise the co-extensive stator flow-through area.

16. The article of manufacture of claim 15 , further comprising a spacer engaging the upstream stator and the downstream stator and having an axial extent encompassing the upstream stator and the downstream stator.

17. The article of manufacture of claim 16 , further comprising a ceramic spacer disposed between the actuator and the spacer.

18. The article of manufacture of claim 15 , wherein the upstream stator and the downstream stator comprise stainless steel.

19. The article of manufacture of claim 15 , further comprising a first beveled washer disposed between the upstream stator and the first rotor, and a second beveled washer disposed between the downstream stator and the second rotor.

20. The article of manufacture of claim 15 , wherein the first flow-through area comprises 55% to 75% of the total first rotor flow area, and wherein the second flow-through area comprises 55% to 75% of the total second rotor flow area.