Dual redundant two-stage valve

1. A vehicle power generation system comprising:

a first solenoid spool valve;

a second solenoid spool valve;

a first poppet valve fluidly connected to a high pressure inlet;

a second poppet valve fluidly connected to the first solenoid spool valve and the first poppet valve;

a third poppet valve fluidly connected to the second solenoid spool valve, the first poppet valve, and an impulse turbine; and

a fourth poppet valve fluidly connected to the second solenoid spool valve, the second poppet valve, and the impulse turbine.

2. The vehicle power generation system of claim 1 , wherein the first solenoid spool valve further comprises:

a spool housing;

a spool located at least partially within the spool housing, the spool fluidly separating the spool housing into a first spool housing chamber, a second spool housing chamber, a third spool housing chamber, and a fourth spool housing chamber; and

a solenoid operably connected to the spool, the solenoid being configured to translate the spool linearly within the spool housing.

3. The vehicle power generation system of claim 2 , wherein the fourth spool housing chamber is located proximate the solenoid and the first spool housing chamber is located opposite the fourth spool housing chamber, wherein the second spool housing chamber and the third spool housing chamber are linearly interposed between the first spool housing chamber and the fourth spool housing chamber, and wherein the second spool housing chamber is linearly interposed between the first spool housing chamber and the third spool housing chamber.

4. The vehicle power generation system of claim 3 , further comprising:

a biasing mechanism located within the first spool housing chamber.

5. The vehicle power generation system of claim 1 , wherein the second solenoid spool valve further comprises:

a spool housing;

a spool located at least partially within the spool housing, the spool fluidly separating the spool housing into a first spool housing chamber, a second spool housing chamber, a third spool housing chamber, a fourth spool housing chamber, and a fifth spool housing chamber; and

a solenoid operably connected to the spool, the solenoid being configured to translate the spool linearly within the spool housing.

6. The vehicle power generation system of claim 5 , wherein the fifth spool housing chamber is located proximate the solenoid and the first spool housing chamber is located opposite the fifth spool housing chamber, wherein the second spool housing chamber, the third spool housing chamber, and fourth spool housing camber are linearly interposed between the first spool housing chamber and the fifth spool housing chamber, wherein the second spool housing chamber is linearly interposed between the first spool housing chamber and the third spool housing chamber, and wherein the third spool housing chamber is linearly interposed between the second spool housing chamber and the fourth spool housing chamber.

7. The vehicle power generation system of claim 6 , further comprising:

a biasing mechanism located within the first spool housing chamber.

8. The vehicle power generation system of claim 1 , wherein the first poppet valve further comprises:

a poppet housing having an outlet;

a poppet located within the poppet housing, the poppet fluidly separating the poppet housing into a first poppet housing chamber and a second poppet housing chamber; and

a biasing mechanism located in the first poppet housing chamber, the biasing mechanism being configured to applies a linear force on the poppet towards the outlet of the first poppet housing.

9. The vehicle power generation system of claim 2 , wherein the first poppet valve further comprises:

a poppet housing having an outlet;

a poppet located within the poppet housing, the poppet fluidly separating the poppet housing into a first poppet housing chamber and a second poppet housing chamber; and

a biasing mechanism located in the first poppet housing chamber, the biasing mechanism applies a linear force on the poppet towards the outlet of the first poppet housing,

wherein the first poppet housing chamber is fluidly connected to the second spool housing chamber of the first solenoid spool valve, and wherein the second poppet housing chamber is fluidly connected to the high pressure inlet.

10. The vehicle power generation system of claim 9 , further comprising:

a vent outlet fluidly connected to the first spool housing chamber when the solenoid of the first solenoid spool valve is deactivated and fluidly connected to the second spool housing chamber when the solenoid of the first solenoid spool valve is activated.

11. The vehicle power generation system of claim 9 , wherein the second poppet housing chamber is fluidly connected to the third poppet valve.

12. The vehicle power generation system of claim 2 , wherein the second poppet valve further comprises:

a poppet housing having an outlet;

a poppet located within the poppet housing, the poppet fluidly separating the poppet housing into a first poppet housing chamber and a second poppet housing chamber; and

a biasing mechanism located in the first poppet housing chamber, the biasing mechanism applies a linear force on the poppet towards the outlet of the first poppet housing,

wherein the first poppet housing chamber is fluidly connected to the third spool housing chamber of the first solenoid spool valve, and wherein the second poppet housing chamber is fluidly connected to the second spool housing chamber of the first solenoid spool valve.

13. The vehicle power generation system of claim 12 , further comprising:

a vent outlet fluidly connected to the third spool housing chamber when the solenoid of the first solenoid spool valve is deactivated and fluidly connected to the fourth spool housing chamber when the solenoid of the first solenoid spool valve is activated.

14. The vehicle power generation system of claim 12 , wherein the second poppet housing chamber is fluidly connected to the fourth poppet valve.

15. The vehicle power generation system of claim 5 , wherein the third poppet valve further comprises:

a poppet housing having an outlet;

a poppet located within the poppet housing, the poppet fluidly separating the poppet housing into a first poppet housing chamber and a second poppet housing chamber; and

a biasing mechanism located in the first poppet housing chamber, the biasing mechanism applies a linear force on the poppet towards the outlet of the first poppet housing,

wherein the first poppet housing chamber is fluidly connected to the fourth spool housing chamber of the second solenoid spool valve, and wherein the second poppet housing chamber is fluidly connected to the third spool housing chamber of the second solenoid spool valve when the solenoid of the second solenoid spool valve is deactivated and fluidly connected to the fourth spool housing chamber of the second solenoid spool valve when the solenoid of the second solenoid spool valve is activated.

16. The vehicle power generation system of claim 15 , further comprising:

a vent outlet fluidly connected to the fourth spool housing chamber when the solenoid of the second solenoid spool valve is deactivated and fluidly connected to the fifth spool housing chamber when the solenoid of the first solenoid spool valve is activated.

17. The vehicle power generation system of claim 15 , wherein the second poppet housing chamber is fluidly connected to the impulse turbine.

18. The vehicle power generation system of claim 5 , wherein the fourth poppet valve further comprises:

a poppet housing having an outlet;

a poppet located within the poppet housing, the poppet fluidly separating the poppet housing into a first poppet housing chamber and a second poppet housing chamber; and

a biasing mechanism located in the first poppet housing chamber, the biasing mechanism applies a linear force on the poppet towards the outlet of the first poppet housing,

wherein the first poppet housing chamber is fluidly connected to the second spool housing chamber of the second solenoid spool valve, and wherein the second poppet housing chamber is fluidly connected to the second spool housing chamber of the second solenoid spool valve when the solenoid of the second solenoid spool valve is deactivated and fluidly connected to the third spool housing chamber of the second solenoid spool valve when the solenoid of the second solenoid spool valve is activated.

19. The vehicle power generation system of claim 18 , further comprising:

a vent outlet fluidly connected to the first spool housing chamber when the solenoid of the second solenoid spool valve is deactivated and fluidly connected to the second spool housing chamber when the solenoid of the first solenoid spool valve is activated.

20. The vehicle power generation system of claim 18 , wherein the second poppet housing chamber is fluidly connected to the impulse turbine.