Plug valve with flow area equal to or greater than the flow area of the connected piping
View Patent ↗A plug valve having an entry region, a chamber, and an outlet region, each with a flow area that is equal to or greater than the flow area of, for example, a standard wall ANSI B 36.10 (M) pipe connected to the inlet and outlet flanges of the valve. The valve's plug has a cylindrical front sealing face and a planar rear face. The axis of the sealing face is parallel to, but off-set from the axis of the plug. When the valve is fully open the planar rear face allows unimpeded flow through the chamber and substantially reduces friction to the flow. The valve's seat is cylindrical for mating with the cylindrical front sealing face of the plug. The seat has a rectangular outline shape.
1. A valve apparatus for use in high-solids applications, the valve apparatus comprising:
(a) a valve body containing:
(i) an interior space,
(ii) a horizontal inlet port defining a cylindrical plug seat, the horizontal inlet port comprising an entry region having a change in outline shape but no reduction in total area,
(iii) a horizontal outlet port substantially aligned with the inlet port, the outlet port constructed such that the maximum vertical dimension of the outlet port is greater than the maximum vertical dimension of the inlet port, and
(iv) a bottom transition zone from the interior space to the outlet port, the transition zone having a substantially flush surface with the outlet port; and
(b) a plug rotatably mounted in the valve body such that the plug rotates around a substantially horizontal axis, the plug comprising:
(i) a cylindrically curved sealing face, and
(ii) a substantially planar second face opposite to the cylindrically curved sealing face;
wherein the plug is configured such that the planar second face is arranged in a substantially horizontal orientation when the valve is open, and the planar second face is arranged in a substantially vertical orientation when the valve is closed.
2. The valve apparatus of claim 1 , wherein the cylindrically curved face of the plug is substantial equal to the surface area of the inlet port.
3. The valve apparatus according to claim 1 , wherein the valve body has a height, and a cross section taken at an intermediate portion of the height perpendicular to the axis of rotation of the plug has one tapered sidewall and one straight sidewall.
4. The valve apparatus of claim 1 , wherein the inlet port is comprised of (i) a circular opening in an outlet flange, (ii) a straight sidewall intersecting the circular opening and terminating in a rear edge, and (iii) a tapered sidewall intersecting the circular opening and terminating in an inlet edge, whereby the straight sidewall increases the flow area of the entry region in comparison to a tapered sidewall.
5. The plug valve of claim 1 , wherein the plug rotates through an arc that is greater than or equal to 95° during closure.
6. A valve apparatus for use in high-solids applications, the valve apparatus comprising:
(a) a valve body comprising:
(i) an interior space,
(ii) a horizontal inlet port defining a seat opening, the horizontal inlet port comprising an entry region having a change in outline shape but no reduction in total area,
(iii) a bottom transition zone between within the interior space adjacent to the outlet port, the bottom transition zone having a surface substantially flush with the outlet port; and
(b) an eccentrically mounted plug rotatably mounted in the valve body such that the plug rotates around a substantially horizontal axis, the plug comprising:
(i) a cylindrically curved sealing face, and
(ii) a substantially planar second face opposite to the cylindrically curved sealing face,
the plug arranged such that the planar second face is located in a substantially horizontal orientation when the valve is open, and the planar second face is arranged in a substantially vertical orientation when the valve is closed.
7. The valve apparatus of claim 6 , wherein the cylindrically curved face of the plug is substantial equal to the surface area of the inlet port.
8. The valve apparatus according to claim 6 , wherein the valve body has a height, and a cross section taken at an intermediate portion of the height perpendicular to the axis of rotation of the plug has one tapered sidewall and one straight sidewall.
9. The plug valve of claim 7 , wherein the plug rotates through an arc that is greater than or equal to 95° during closure.
10. A valve apparatus for use in high-solids applications, the valve apparatus comprising:
(a) a valve body comprising:
(i) an interior space,
(ii) a horizontal inlet port defining a seat opening, the horizontal inlet port comprising an entry region having a change in outline shape but no reduction in total area,
(iii) a horizontal outlet port aligned with the inlet port, and
(iv) a bottom transition zone between within the interior space adjacent to the outlet port, the bottom transition zone having a surface substantially flush with the horizontal outlet port;
(b) a plug rotatably mounted in the valve body such that the plug rotates around a substantially horizontal axis, the plug comprising:
(i) a cylindrically curved sealing face, and
(ii) a substantially planar second face opposite to the cylindrically curved sealing face,
the plug arranged such that the planar second face is located in a substantially horizontal orientation when the valve is open, and the planar second face is arranged in a substantially vertical orientation when the valve is closed.
11. The valve apparatus of claim 10 , wherein the cylindrically curved face of the plug is substantial equal to the surface area of the inlet port.
12. The valve apparatus according to claim 10 , wherein the valve body has a height, and a cross section taken at an intermediate portion of the height perpendicular to the axis of rotation of the plug has one tapered sidewall and one straight sidewall.
13. The valve apparatus of claim 10 , wherein the inlet port is comprised of (i) a circular opening in an inlet flange, (ii) a straight sidewall intersecting the circular opening and terminating in a rear edge, and (iii) a tapered sidewall intersecting the circular opening and terminating in an inlet edge, whereby the straight sidewall increases the flow area of the entry region in comparison to a tapered sidewall.
14. The valve apparatus of claim 10 , wherein the plug rotates through an arc that is greater than or equal to 95° during closure.