Ball valve

1. A ball valve comprising:

a first ball body assembly comprising a ball body, a first annular groove disposed in the ball body, a first annular seat disposed in the first annular groove, and a first spring disposed in the first annular groove between the ball body and the first annular seat, wherein the first spring biases the first annular seat outwardly from the ball body;

a first fluid chamber disposed along the first annular groove between the ball body and the first annular seat, and the first fluid chamber is configured to use fluid pressure to bias the first annular seat outwardly from the ball body; and

a valve body having a fluid passage in fluid communication with the first ball body assembly, wherein the first ball body assembly is disposed inside the valve body and is configured to rotate relative to the valve body to open and close the fluid passage.

2. The ball valve of claim 1 , comprising a first seal, a first seat ring, and the first fluid chamber each disposed along the first annular groove between the ball body and the first annular seat, wherein the first seat ring couples the first annular seat to the ball body, wherein the first seal seals the first annular seat to the ball body.

3. The ball valve of claim 2 , wherein the first ball body assembly comprises a second annular groove disposed in the ball body, a second annular seat disposed in the second annular groove opposite the first annular groove, and a second spring disposed in the second annular groove between the ball body and the second annular seat, wherein the second spring biases the second annular seat outwardly from the ball body.

4. The ball valve of claim 3 , comprising a second seal, a second seat ring, and a second fluid chamber each disposed along the second annular groove between the ball body and the second annular seat, wherein the second seat ring couples the second annular seat to the ball body, wherein the second seal seals the second annular seat to the ball body, wherein the second fluid chamber is configured to use fluid pressure to bias the second annular seat outwardly from the ball body.

5. The ball valve of claim 4 , wherein the first and second annular seats are metal, and the first and second annular seats have a metal to metal contact with the valve body.

6. The ball valve of claim 1 , wherein the first annular seat and the valve body comprise metal surfaces that seat against one another.

7. The ball valve of claim 1 , wherein the first spring is disposed directly between the ball body and the first annular seat.

8. The ball valve of claim 1 , comprising a valve end having a bore coupled to the valve body and in fluid communication with the fluid passage, wherein the first annular seat contacts a wall of a bore when the ball valve is in a closed position.

9. The ball valve of claim 8 , wherein the first annular seat comprises a first metal, and the wall comprises a second metal.

10. The ball valve of claim 1 , wherein the valve body comprises an entry opening extending crosswise into the fluid passage to provide access to the first ball body assembly.

11. The ball valve of claim 1 , comprising a second ball body assembly, wherein the second ball body assembly is disposed inside the valve body and is configured to rotate relative to the valve body to open and close the fluid passage.

12. A system comprising:

an integrated seat assembly, comprising:

an annular seat having an outer surface opposite from an inner surface, wherein the inner surface is configured to mount within an annular groove on a ball body;

a spring disposed along the inner surface of the annular seat, wherein the spring is configured to bias the annular seat to move over a distance outwardly from the annular groove of the ball body; and

a seat ring recessed into the annular seat along the inner surface, wherein the seat ring is configured to limit displacement of the annular seat relative to the ball body, wherein the integrated seat assembly is configured to substantially seal a fluid passage of a valve body when the ball body is in a closed position.

13. The integrated seat system of claim 12 , wherein the integrated seat assembly comprises a fluid chamber along the inner surface of annular seat, wherein the fluid chamber is configured to receive a fluid pressure to bias the annular seat outwardly from the annular groove of the ball body.

14. The integrated seat system of claim 13 , comprising the ball body having the integrated seat assembly disposed in the annular groove.

15. The ball valve of claim 1 , wherein the first fluid chamber is disposed in the first annular groove directly in the ball body, and the first fluid chamber is disposed directly between the first annular seat and the ball body in the first annular groove.

16. The ball valve of claim 15 , wherein the first ball body assembly comprises a first seat ring disposed in the first annular groove, and the first seat ring limits a displacement of the first annular seat relative to the ball body.

17. A method, comprising:

selectively blocking a fluid passage through a valve body with a first ball body assembly disposed within the valve body, wherein the first ball body assembly comprises a ball body, a first annular groove disposed in the ball body, a first annular seat disposed in the first annular groove, and a first spring disposed in the first annular groove between the ball body and the first annular seat;

coupling the first annular seat to the ball body with a first seat ring;

sealing the first annular seat to the ball body with a first seal;

biasing the first annular seat outwardly from the ball body with a first fluid chamber, wherein the first seal, the first seat ring, and the first fluid chamber are each disposed along the first annular groove between the ball body and the first annular seat; and

seating the first annular seat against the valve body, wherein seating comprises biasing the first annular seat outwardly from the ball body with the first spring.

18. The method of claim 17 , wherein seating comprises making metal to metal contact between the first annular seat and the valve body, wherein the first spring is disposed directly between the ball body and the first annular seat.