Ball valve seat seal
View Patent ↗In an embodiment of the present invention, a valve seal for a ball valve includes a ball configured to mate with a tail piece, an annular seat ring to facilitate the mating of the ball with the tail piece, the seat ring having an angled wall having a first groove for accommodating a first seal and a second groove for accommodating a second seal, the first seal having a different Young's modulus from the second seal.
1. A valve seal for a ball valve, comprising:
a ball configured to mate with a tail piece;
an annular single piece seat ring having an interior portion and an exterior portion to facilitate the mating of the ball with the tail piece,
a single seal component group comprising a first seal and a second seal, the first seal being an annular band and being frusto-conical in geometry and the first seal having a cross-sectional shape that is a parallelogram,
the seat ring having an angled wall having a first groove for accommodating the first seal and a second groove for accommodating the second seal, the first seal having a different Young's modulus from the second seal, wherein said first seal and said second seal are each retained in said respective first and second grooves by press fit;
the second groove having a plurality of indentations configured to grip the second seal and the second seal being initially circular in cross-section and configured to conform to and be gripped by the plurality of indentations; and
a hole formed on said seat ring wherein said hole allows for the flow of lubricant there through around said ball.
2. The valve seal of claim 1 , wherein the first seal is formed of an elastomeric material.
3. The valve seal of claim 1 , wherein the first seal has a Young's modulus of about 0.01 GPa to about 1 GPa.
4. The valve seal of claim 1 , wherein the second seal is formed of a polymer material.
5. The valve seal of claim 1 , wherein the second seal is formed of Nylon.
6. The valve seal of claim 1 , wherein the second seal has a Young's modulus of about 1.5 GPa to about 5 GPa.
7. A valve seal for a ball valve, comprising:
a ball;
an annular single piece seat ring having an interior portion and an exterior portion and a first groove and a second groove, configured to contact the ball, wherein the first groove has a first groove wall angled at an angle θ 1 of less than 90° relative to a longitudinal axis disposed at a radial center of the seat;
a single seal component group comprising a first seal that is conical in geometry and a second seal, wherein said first seal and said second seal are each retained in said respective first and second grooves by press fit;
the first seal comprising a frusto-conical annular band having a cross-sectional shape that is a parallelogram, wherein a first interior wall of the band is disposed at an angle θ 2 of less than 90° relative to a longitudinal axis disposed at a radial center of the band;
the second groove having a plurality of indentations configured to grip the second seal and the second seal being initially circular in cross-section and configured to conform to and be gripped by the plurality of indentations; and
a hole formed on said seat ring wherein said hole allows for the flow of lubricant there through around said ball.
8. The valve seal of claim 7 , wherein angle θ 1 and angle θ 2 have a ratio of about 0.5:1 to about 1:1.
9. The valve seal of claim 7 , wherein angle θ 1 and angle θ 2 have a ratio of about 1:1.
10. The valve seal of claim 7 , wherein the band is formed of an elastomeric material.
11. The valve seal of claim 7 , wherein the band has a Young's modulus of about 0.01 GPa to about 1 GPa.
12. The valve seal of claim 7 , wherein the second groove is configured to receive a second seal.
13. The valve seal of claim 7 , wherein the second seal is formed of a polymer material.
14. The valve seal of claim 7 , wherein the second seal is formed of Nylon.
15. The valve seal of claim 7 , wherein the second seal has a Young's modulus of about 1.5 GPa to about 5 GPa.