Air admittance valve preventing mephitis overflow

1. An apparatus comprising an air admittance valve, the air admittance valve comprising:

a main body comprising an air entry guide base defining an air entry guide, a pivot support, and a valve seat;

a sealing valve group comprising a sealing valve body, that defines a recess; a flexible member; a pivot housing; and a pivot;

wherein the valve seat is located about the air entry guide; the pivot is located in the pivot housing and the pivot support, and the pivot is located along, or adjacent to, a center of gravity of the sealing valve body; the flexible member is at least partially located in the recess and abuts the main body; and when the air admittance valve is closed, the sealing valve body abuts the valve seat.

2. The apparatus of claim 1 , further comprising an external lid body; wherein the external lid body is coupled to the main body.

3. The apparatus of claim 1 , further comprising a connecting pipe body, and the connecting pipe body comprises a connecting head; wherein the connecting head is coupled to the main body.

4. The apparatus of claim 3 , wherein the connecting head comprises a connecting head thread, and the main body comprises a main body thread; and the connecting head thread is engaged with the main body thread.

5. The apparatus of claim 1 , wherein the main body further comprises a blocking protrusion, the flexible member is a spring, and the spring is located about the blocking protrusion.

6. The apparatus of claim 1 , wherein the main body comprises a plurality of lugs, an external lid body defines a plurality of slide grooves, and the plurality of lugs are received within the plurality of slide grooves.

7. The apparatus of claim 1 , wherein the main body defines a main body recess, and the valve seat is located in the main body recess.

8. The apparatus of claim 1 , wherein the air admittance valve will open in response to a pressure, and the pressure is in a range of 0.008 pounds per square inch (psi) to 3 psi.

9. The apparatus of claim 1 , wherein when the air admittance valve is opened, air will flow into an external lid body and through the air entry guide.

10. A vehicle comprising:

an air admittance valve comprising:

a main body comprising an air entry guide base defining an air entry guide, a pivot support, and a valve seat;

a sealing valve group comprising a sealing valve body, that defines a recess; a flexible member; a pivot housing; and a pivot;

wherein the valve seat is located about the air entry guide; the pivot is located in the pivot housing and the pivot support, and the pivot is located along, or adjacent to, a center of gravity of the sealing valve body; the flexible member is at least partially located in the recess and abuts the main body; and when the air admittance valve is closed, the sealing valve body abuts the valve seat.

11. The vehicle of claim 10 , further comprising an external lid body; wherein the external lid body is coupled to the main body.

12. The vehicle of claim 10 , further comprising a connecting pipe body, and the connecting pipe body comprises a connecting head; wherein the connecting head is coupled to the main body.

13. The vehicle of claim 12 , wherein the connecting head comprises a connecting head thread, and the main body comprises a main body thread; and the connecting head thread is engaged with the main body thread.

14. The vehicle of claim 10 , wherein the air admittance valve will open in response to a pressure, and the pressure is in a range of 0.008 PSI to 3 PSI.