Plug valve assembly

1. A plug valve assembly comprising:

a valve body having an inlet and an outlet each defining a fluid passageway in fluid communication with a cavity defined within the valve body;

a plug having a spindle top and having a plug body disposed within the cavity of the valve body and defining a through opening that, when the spindle top is rotated, the plug body rotates within the cavity and is operable to obstruct the fluid passageway when the plug body is in a closed position and operable to connect the fluid passageway of the inlet to the fluid passageway of the outlet when the plug body is in an open position;

a cap having threaded engagement with the valve body and operable to retain the plug within the valve body cavity;

a sleeve disposed at an interface between walls of the valve body cavity and the plug body, the sleeve including an inner surface having defined thereon a plurality of channels operable to distribute a lubricant around the plug body to facilitate rotational movement of the plug body within the valve body cavity; and

a grease port defined in the valve body in fluid communication with the channels defined on the sleeve,

wherein the sleeve comprises:

an inlet insert having an opening in alignment with the inlet fluid passageway;

an outlet insert having an opening in alignment with the outlet fluid passageway; and

first and second space plate inserts disposed between the inlet insert and the outlet insert.

2. The plug valve assembly of claim 1 , wherein the spindle top of the plug has a hexagonal outer profile and a through opening.

3. The plug valve assembly of claim 1 , wherein a bottom face of the plug body defines a circular base that is operable to be accommodated within a circular seat defined on a floor of the valve body cavity.

4. The plug valve assembly of claim 1 ,

wherein a channel, of the plurality of channels, defined on the inlet insert is in fluid communication with a channel, of the plurality of channels, defined on the outlet insert and in fluid communication with the grease port.

5. The plug valve assembly of claim 1 ,

wherein channels, of the plurality of channels, defined on one or more of the inlet insert, the outlet insert, or the first and second space plate inserts are in fluid communication with the grease port.

6. The plug valve assembly of claim 1 , wherein a bottom face of the plug body defines a groove that is operable to receive a protruding nub disposed on a floor of the valve body cavity, where the groove effectively defines a rotational travel limit for the plug.

7. The plug valve assembly of claim 1 , wherein the valve body further incorporates a collar having defined thereon threaded holes for engaging with threaded fasteners used to secure actuating devices to actuate rotational action of the spindle top.

8. The plug valve assembly of claim 1 , further comprising a packing seal disposed at an interface between the plug body and the cap.

9. The plug valve assembly of claim 1 , further comprising:

an annular face seal disposed about the inlet at an interface between the inlet insert and the valve body; and

an annular face seal disposed about the outlet at an interface between the outlet insert and the valve body.

10. A plug valve assembly comprising:

a valve body having an inlet and an outlet, each defining a fluid passageway in fluid communication with a generally cylindrical cavity defined within the valve body, and an internally threaded collar defining a service access opening extending upward from the valve body cavity;

a plug having a spindle top and having a plug body disposed within the cavity of the valve body and defining a through opening that, when the spindle top is rotated, the plug body rotates within the cavity and is operable to obstruct the fluid passageway when the plug body is in a closed position and operable to connect the fluid passageway of the inlet to the fluid passageway of the outlet when the plug body is in an open position;

the spindle top of the plug has a hexagonal outer profile and a through opening and is adaptable to engage with an actuating device selected from the group consisting of wrench, manual, air, gearbox, and hydraulic actuating devices;

an externally-threaded cap having a threaded engagement with the collar of the valve body and operable to retain the plug within the valve body cavity;

a sleeve comprising an inlet insert, an outlet insert, and first and second space plate inserts disposed at an interface between walls of the valve body cavity and the plug body, the inserts having defined, on inner surfaces thereof, channels operable to distribute a lubricant around the plug body to facilitate rotational movement of the plug body within the valve body cavity; and

a grease port defined in the valve body in fluid communication with the channels defined on the sleeve; and

a grease fitting removably secured within the grease port.

11. The plug valve assembly of claim 10 , wherein a bottom face of the plug body

defines a circular base that is operable to be accommodated within a circular seat defined on a floor of the valve body cavity.

12. The plug valve assembly of claim 10 , wherein a bottom face of the plug body defines a groove that is operable to receive a protruding nub disposed on a floor of the valve body cavity, where the groove effectively defines a rotational travel limit for the plug.

13. The plug valve assembly of claim 10 , further comprising a packing seal disposed at an interface between the plug body and the cap.

14. The plug valve assembly of claim 10 , further comprising:

an annular face seal disposed about the inlet at an interface between the inlet insert and the valve body; and

an annular face seal disposed about the outlet at an interface between the outlet insert and the valve body.

15. A plug valve assembly comprising:

a valve body having an inlet and an outlet each defining a fluid passageway in fluid communication with a cavity defined within the valve body, and a collar defining a service access opening extending upward from the valve body cavity;

a plug having a spindle top and having a plug body disposed within the cavity of the valve body and defining a through opening that, when the spindle top is rotated, the plug body rotates within the cavity and is operable to obstruct the fluid passageway when the plug body is in a closed position and operable to connect the fluid passageway of the inlet to the fluid passageway of the outlet when the plug body is in an open position;

the spindle top of the plug being adaptable to engage with an actuating device selected from the group consisting of wrench, manual, bar, air, gearbox, and hydraulic actuating devices;

a cap removably engaged with the collar of the valve body and operable to retain the plug within the valve body cavity; and

a sleeve disposed at an interface between walls of the valve body cavity and the plug body, the sleeve including an inner surface having defined thereon channels operable to distribute a lubricant around the plug body to facilitate rotational movement of the plug body within the valve body cavity,

wherein the sleeve comprises:

an inlet insert having an opening in alignment with the inlet fluid passageway;

an outlet insert having an opening in alignment with the outlet fluid passageway; and

first and second space plate inserts disposed between the inlet insert and the outlet insert.

16. The plug valve assembly of claim 15 , wherein the spindle top of the plug has a hexagonal outer profile and a through opening.

17. The plug valve assembly of claim 15 , wherein a bottom face of the plug body defines a circular base that is operable to be accommodated within a circular seat defined on a floor of the valve body cavity.

18. The plug valve assembly of claim 15 wherein one or more of the channels defined on the inserts are in fluid communication with a grease port formed on the valve body.

19. The plug valve assembly of claim 15 , wherein a bottom face of the plug body defines a groove that is operable to receive a protruding nub disposed on a floor of the valve body cavity, where the groove effectively defines a rotational travel limit for the plug.

20. The plug valve assembly of claim 15 , further comprising:

a packing seal disposed at an interface between the plug body and the cap;

an annular face seal disposed about the inlet at an interface between the inlet insert and the valve body; and

an annular face seal disposed about the outlet at an interface between the outlet insert and the valve body.