Gate valve gate member for a gate valve

1. A gate member for a gate valve for a fluid, the gate valve including a valve body having an internal valve cavity, first and second flow passageways extending through the valve body, each passageway having a longitudinal axis, a first seat having first and second ends, the first end disposed adjacent the first flow passageway, the second end of the first seat having a seat end face, the first seat being tubular, the gate member comprising:

a gate member, having an upper end, a lower end, a first side and a second side, and having an opening, the opening having an upper end and a lower end, and the gate member is moveable between an open position in which the opening is positioned into a fluid transmitting relationship with the first and second flow passageways and a closed position in which the opening is out of alignment with the first and second flow passageways;

the gate member having a first sealing face surface on the first side of the gate member, the interface between the seat end face and the gate member being annular and having an outer diameter; and

the first sealing face surface of the gate member having at least one recess formed in the first sealing face surface, the recess disposed in a spaced relationship from a portion of the seat end face of the second end of the first seat as the gate member moves into the fluid transmitting relationship with the first and second flow passageways, the at least one recess being discontiguous with the opening of the gate member, wherein:

the recess is positioned entirely within the outer diameter of the annular interface between the seat end face and the gate member when the gate member is in the closed position, such that the at least one recess is in fluid communication with the first flow passageway and not the internal valve cavity when the gate is in the closed position.

2. The gate member of claim 1 , including a second seat having first and second ends, the first end disposed adjacent the second flow passageway, the second end of the second seat having a seat end face; the gate member having a second sealing face surface on the second side of the gate member; the second sealing face surface of the gate member having at least one recess formed in the second sealing face surface, the recess disposed in a spaced relationship from a portion of the seat end face of the second end of the second seat as the gate member moves into the fluid transmitting relationship with the first and second flow passageways.

3. The gate member of claim 2 , wherein the at least one recess formed in the first sealing face surface includes an arc-shaped portion.

4. The gate member of claim 3 , wherein the arc-shaped portion of the at least one recess includes a rounded, triangular-shaped portion depending from the arc-shaped portion.

5. A gate member for a gate valve for a fluid, the gate valve including a valve body having an internal valve cavity, first and second flow passageways extending through the valve body, each passageway having a longitudinal axis, a first seat having first and second ends, the first end disposed adjacent the first flow passageway, the second end of the first seat having a seat end face, the first seat being tubular, the gate member comprising:

a gate member, having an upper end, a lower end, a first side and a second side, and having an opening, the opening having an upper end and a lower end, and the gate member is moveable between an open position in which the opening is positioned into a fluid transmitting relationship with the first and second flow passageways and a closed position in which the opening is out of alignment with the first and second flow passageways;

the gate member having a first sealing face surface on the first side of the gate member, the interface between the seat end face and the gate member being annular and having an outer diameter; and

the first sealing face surface of the gate member having at least one recess formed in the first sealing face surface, the recess disposed in a spaced relationship from a portion of the seat end face of the second end of the first seat as the gate member moves into the fluid transmitting relationship with the first and second flow passageways, the at least one recess being discontiguous with the opening of the gate member, wherein:

the recess is positioned entirely outside the outer diameter of the annular interface between the seat end face and the gate member when the gate member is in the closed position, such that the at least one recess is in fluid communication with the internal valve cavity and not the first flow passageway when the gate is in the closed position.

6. The gate member of claim 5 , wherein the first sealing face surface includes first and second rounded triangular-shaped portions, disposed in a spaced relationship from each other and aligned with the lower end of the opening in the gate member.

7. The gate member of claim 5 , wherein the first sealing face surface includes first and second triangular-shaped portions disposed in a spaced relationship from each other and adjacent aligned with the upper end of the opening in the gate member.

8. The gate member of claim 5 , wherein the first sealing face surface includes an arc-shaped portion disposed adjacent the lower end of the gate member.

9. A gate valve for a fluid comprising:

a valve body having an internal valve cavity;

first and second flow passageways extending through the valve body, each passageway having a longitudinal axis;

a gate member, having an upper end, a lower end, a first side and a second side, disposed within the valve body, the gate member having an opening, the opening having an upper end and a lower end, and the gate member is moveable between an open position in which the opening is positioned into a fluid transmitting relationship with the first and second flow passageways and a closed position in which the opening is out of alignment with the first and second flow passageways;

a first seat between the gate member and the first flow passageway, the first seat having first and second ends, the first end disposed adjacent the first flow passageway and the second end disposed adjacent the first side of the gate member, the second end of the first seat having a seat end face, the first seat being tubular, the interface between the seat end face and the gate member being annular and having an outer diameter;

the gate member having a first sealing face surface on the first side of the gate member; and

the first sealing face surface of the gate member having at least one recess formed in the first sealing face surface, the recess disposed in a spaced relationship from a portion of the seat end face of the second end of the first seat as the gate member moves into the fluid transmitting relationship with the first and second flow passageways, the at least one recess being discontiguous with the opening of the gate member, wherein:

the recess is positioned entirely within the outer diameter of the annular interface between the seat end face and the gate member when the gate member is in the closed position, such that the at least one recess is in fluid communication with the first flow passageway and not the internal valve cavity when the gate is in the closed position.

10. The gate valve of claim 9 , including a second seat between the gate member and the second flow passageway, the second seat having first and second ends, the first end disposed adjacent the second flow passageway and the second end of the second seat disposed adjacent the second side of the gate member, the second end of the second seat having a seat end face; the gate member having a second sealing face surface on the second side of the gate member; the second sealing face surface of the gate member having at least one recess formed in the second sealing face surface, the recess disposed in a spaced relationship from a portion of the seat end face of the second end of the second seat as the gate member moves into the fluid transmitting relationship with the first and second flow passageways.

11. The gate valve of claim 10 , wherein the at least one recess formed in the first sealing face surface includes an arc-shaped portion.

12. A gate valve for a fluid comprising:

a valve body having an internal valve cavity;

first and second flow passageways extending through the valve body, each passageway having a longitudinal axis;

a gate member, having an upper end, a lower end, a first side and a second side, disposed within the valve body, the gate member having an opening, the opening having an upper end and a lower end, and the gate member is moveable between an open position in which the opening is positioned into a fluid transmitting relationship with the first and second flow passageways and a closed position in which the opening is out of alignment with the first and second flow passageways;

a first seat between the gate member and the first flow passageway, the first seat having first and second ends, the first end disposed adjacent the first flow passageway and the second end disposed adjacent the first side of the gate member, the second end of the first seat having a seat end face, the first seat being tubular, the interface between the seat end face and the gate member being annular and having an outer diameter;

the gate member having a first sealing face surface on the first side of the gate member; and

the first sealing face surface of the gate member having at least one recess formed in the first sealing face surface, the recess disposed in a spaced relationship from a portion of the seat end face of the second end of the first seat as the gate member moves into the fluid transmitting relationship with the first and second flow passageways, the at least one recess being discontiguous with the opening of the gate member, wherein:

the recess is positioned entirely outside the outer diameter of the annular interface between the seat end face and the gate member when the gate member is in the closed position, such that the at least one recess is in fluid communication with the internal valve cavity and not the first flow passageway when the gate is in the closed position.

13. The gate valve of claim 12 , wherein the first sealing face surface includes first and second rounded triangular-shaped portions, disposed in a spaced relationship from each other and aligned with the lower end of the opening in the gate member.

14. The gate valve of claim 12 , wherein the first sealing face surface includes first and second triangular-shaped portions disposed in a spaced relationship from each other and aligned with the upper end of the opening in the gate member.

15. The gate valve of claim 12 , wherein the first sealing face surface includes an arc-shaped portion disposed adjacent the lower end of the gate member.