US 12,768,463 B2 · Flow channel for globe valve

Abstract

An improved flow channel for a globe valve featuring low head loss includes a valve chamber, a ring-shaped ditch, an inlet passage, a valve inlet, a valve seat, an outlet passage, and a valve outlet. The ring-shaped ditch is installed at the periphery of the valve seat and formed with a bevel at its bottom. When a valve plug of the globe valve departs from the valve seat, the valve plug and the valve seat jointly define a radial passage. A fluid flowing in from the valve inlet and the inlet passage enters the radial passage as smooth streamlines, and the streamlines spread in the radial passage to enter the outlet passage as a rushing stream and a tranquil stream that flow independently. Thereby, the improved flow channel prevents generation of any circumfluence zone and flow interference and eventually reduces head loss.

An improved flow channel for a globe valve, which features high eco-friendliness and low head loss, the improved flow channel comprising:

a valve chamber, a ring-shaped ditch, a valve seat, a valve plug, a seal surface, a valve inlet, an inlet passage, a center hole, a valve outlet, an outlet passage, and an internal outlet;
the improved flow channel defining a valve-chamber inner diameter, a valve-plug outer diameter, a valve-seat outer diameter, a valve-inlet diameter, a valve-outlet diameter, and a center-hole diameter;
the seal surface of the valve seat being located at an outer side of the center hole, the center hole having a center point (P1) that has a height (LH1), the internal outlet having a center point (P3) that has a height (LH2), the seal surface having a height (LH3), the valve inlet having a center point (P2), and the valve outlet having a center point (P4);
a horizontal line (XL1) passing through the center point (P1) of the center hole and intersecting a circumference of the center hole at a distal point (E1) and a proximal point (E2), wherein the distal point (E1) is located near the valve inlet, and the proximal point (E2) is located near the valve outlet;
a channel axis (XL2) (or an X axis) horizontally passing through the center point (P2) and the center point (P4), wherein the channel axis (XL2) defines a coordinates zero point of a Y axis that is perpendicular to the channel axis and forms a baseline that represents 0 in terms of height so that any point in the improved flow channel is located by a positive value, a zero value, or negative value depending on whether the point is above, on, or below the channel axis (XL2);
a vertical line (YL1) passing through the center point (P1) and intersecting the channel axis (XL2) at a point (P11);
a vertical line (YL2) passing through the center point (P4), and intersecting a circumference of the valve outlet at a distal point (E5) and a proximal point (E6), the proximal point (E6) being a nadir of the outlet passage;
a vertical line (YL3) passing through the center point (P3) of the internal outlet, intersecting the channel axis (XL2) at a point (P31), and intersecting a circumference of the internal outlet at a distal point (E3) and a proximal point (E4), the distal point (E3) having a height (LH4) and the proximal point (E4) having a height (LH5);
a vertical line (YL4) passing through the center point (P2) and intersecting a circumference of the valve inlet at a distal point (E7) and a proximal point (E8), the proximal point (E8) being a nadir of the inlet passage;
the center point (P1) and the center point (P2) being spaced apart from each other by a horizontal distance (L1);
the center point (P4) and the center point (P1) being spaced apart from each other by a horizontal distance (L2);
and the center point (P2) and the center point (P4) being spaced apart from each other by a horizontal distance (L), where L=L1+L2;
the center point (P4) and the center point (P3) being spaced apart from each other by a horizontal distance (LL2), where
LL
2
=
L
2
-
d
3
2
;
wherein d3 is the valve-chamber inner diameter;
the valve chamber being provided therein with the ring-shaped ditch and the valve seat, and being provided with the valve plug, a valve stem, and the seal surface, in which the valve plug, the valve stem, and the seal surface are concentric;
the valve chamber connecting the inlet passage and the outlet passage;
the inlet passage extending from the valve inlet horizontally and then turning upward and having an outlet end that is right on the center hole of the valve seat;
the internal outlet being installed on an inner periphery of the valve chamber and being used to connect the outlet passage;
the valve inlet and the valve outlet being installed at two sides of the valve body, respectively;
the ring-shaped ditch being located on an inner wall of the valve chamber and encircling an outer periphery of the valve seat, the ring-shaped ditch having a bottom that is formed with a bevel at an oblique angle (β), the bevel having a higher side located near the inlet passage and having a lower side located near the outlet passage to be connected to the proximal point (E4) of the internal outlet;
the valve seat being installed at the outlet end of the inlet passage and provided with the seal surface;
the valve plug being cylindrical in shape and having a bottom formed with a plane, when the globe valve is closed, the valve plug being engaged with and sealing the seal surface;
when the valve is fully open, a bottom surface of the valve plug and the seal surface jointly forming a radial passage that has an opening having a diameter (B1), where
0.125
≤
B
1
d
0
≤
0.5
;
the inlet passage having the valve inlet, an inlet center line (S1), the center hole, an upper-edge line (S1a), and a lower-edge line (S1b);
the inlet center line (S1) connecting the center point (P1), a center point (PDP), and the center point (P2), and forming an included angle (γ1) with the vertical line (YL1) at the center point (P1);
wherein, when the included angle γ1≠0°, the center hole being a non-standard elliptical hole that has a major axis having a length of ax in an X-axis direction, wherein the length ax exceeds or is equal to d0;
wherein the included angle γ1=0°, wherein the do is a diameter of the center hole, wherein the length ax corresponds to a distance between the distal point (E1) and the proximal point (E2), wherein the distance between the distal point (E1) and the center point (P1) is more or equal to a distance between the center point (P1) and proximal point (E2), and wherein a minor axis having a length (bz) extends in a Z-axis direction that is a direction of a Z axis perpendicular to both of the X axis and the Y axis, where the minor axis length (bz) equals the center hole diameter (d0);
the upper-edge line (S1a) connecting the distal point (E1) and the distal point (E7), the lower-edge line (S1b) connecting the proximal point (E2) and the proximal point (E8);
the radial passage having a radial center line (S12) and the opening having a diameter (B1), when the valve plug is open, the bottom surface of the valve plug and the seal surface jointly forming the radial passage that has the opening diameter (B1), the radial passage being a channel encircling the center hole, the radial passage having a height (LH6), where the radial passage height (LH6) is equal to the sum of the opening diameter (B1) and the seal surface height (LH3);
the radial center line (S12) connecting the center point (P1) and the center point (P3), and the radial passage extending radially from the center point (P1) toward the center point (P3) in various directions;
the outlet passage having the internal outlet, the valve outlet, an outlet center line (S2) an upper-edge line (S2a), and a lower-edge line (S2b);
the outlet center line (S2) connecting the center point (P3) and the center point (P4), and forming an included angle (γ2) with the vertical line (YL3) at the center point (P3), where 0°≤γ2<90°, when the internal outlet is a non-standard elliptical hole, the internal outlet having a major axis having a length (ay) in the Y-axis direction, where the length (ay) exceeds or is equal to the diameter of the do of the center hole, wherein the length ay corresponds to the distance between the distal point (E3) and proximal point (E4), wherein the distance between the distal point (E3) and the center point (P3) exceeds or equal to the distance between the center point (P3) and the proximal point (E4), and where the internal outlet includes a minor axis having the length (bz) in the Z-axis direction, where the minor axis length (bz) equals the center hole diameter (d0);
wherein, when the included angle dimension γ2=90°, the outlet passage is a horizontal, straight pipe, and the length ay=d0;
the upper-edge line (S2a) connecting the distal point (E3) and the distal point (E5), the lower-edge line (S2b) connecting the proximal point (E4) and the proximal point (E6);
the distal point (E3) having a height difference H1 with respect to the seal surface, when the distal point (E3) is located higher than the seal surface, then the height difference H1≥0;
otherwise, H1≤0;
the internal outlet center point (P3) having a height difference H3 with respect to the seal surface, when the center point (P3) is located higher than the seal surface, then the height difference H3≥0;
otherwise, H3≤0;
a radial gap (B3) being defined between the valve-plug outer diameter d2 and the valve-chamber inner diameter d3, where the radial gap
(
B
3
)
⁢
is
⁢
equal
⁢
to
⁢
(
d
3
-
d
2
)
/
2
,
0.2
≤
B
3
d
0
≤
0.4
;
an annular space (B2) being defined between the valve-seat outer diameter (d1) and valve-chamber inner diameter (d3), where a dimension
(
B
2
)
⁢
of
⁢
the
⁢
annular
⁢
space
⁢
is
⁢
equal
⁢
to
⁢
(
d
3
-
d
1
)
/
2
,
0.25
≤
B
2
d
0
≤
0.4
;
an inner diameter ratio
d
3
d
0
being a ratio between the valve-chamber inner diameter (d3) and the valve-inlet diameter (d0), where
1.75
≤
d
3
d
0
≤
2.8
;
through the inlet center line (S1), the radial center line (S12) and outlet center line (S2), a fluid flowing in the improved flow channel as streamlines, wherein:
the inlet center line (S1) being a single line segment or a combination of different line segments, including:
any one or more of curved lines, vertical line segments, oblique line segments, and horizontal line segments, the vertical line segment being coaxial with the vertical line (YL1), the horizontal line segment being coaxial with the channel axis (XL2), a corner (A) being a corner along which the inlet center line (S1) turns from the valve inlet to the center hole;
all of the streamlines of the fluid coming out the center hole flowing radially in the various directions in the radial passage, a corner (B) being a corner along which the fluid turns from the inlet center line (S1) to the radial center line (S12), all of the streamlines horizontally, radially passing through a spread (C) with turns while flowing toward the internal outlet;
the fluid in the spread (C) having a flowing rate that decreases after the corner (B) due to increase in an area of the radial passage and increases as the area decreases while the fluid makes the turns and flows toward the internal outlet;
the radial center line (S12) being a straight line or a curved line or a multi-curve line depending on relative positions of the seal surface and the internal outlet;
driven by a pressure difference formed between the valve inlet and the valve outlet, the streamlines of fluid at the spread (C) in the radial center line (S12) splitting up into a rushing stream (S121) and a tranquil stream (S122), wherein the rushing stream (S121) is formed by some of the streamlines that are affected by a relatively high pressure-difference gradient to have a relatively high streamline density and has a relatively high flow rate, and the tranquil stream is formed by some of the streamlines that are affected by a relatively low pressure-difference gradient to have a relatively low streamline density and has a relatively low flow rate;
the streamlines fanning out across of the spread (C), and, due to the corner (B), the rushing stream (S121) fanning out at a circumferential angle toward the internal outlet, and the tranquil stream (S122) fanning out at circumferential angles other than the circumferential angle at which the rushing stream fans out;
the rushing stream (S121) and the tranquil stream (S122) making turns at a corner (D), respectively, before flowing into the internal outlet, where the rushing stream (S121) turns at a corner (D1), and the tranquil stream (S122) turns at a corner (D2);
the outlet center line (S2) being a single line segment or a combination of different line segments, including:
any one or more of curved lines, vertical line segments, oblique line segments, and horizontal line segments, the horizontal line segment being coaxial with channel axis (XL2);
the corner (D) being a bend connecting the radial center line (S12) and the outlet center line (S2), the fluid passing through the internal outlet and the outlet passage and then turning at a corner (E) to flow out the valve outlet;
the improved flow channel being characterized in that:
in a 3D surface plot of an inner wall of the inlet passage covering a range that starts from the circumference of the valve inlet and ends at the round center hole having the diameter do through the inlet center line (S1), there are an upper-edge line (S1a) and a lower-edge line (S1b);
the inlet center line (S1) including a straight line segment and a curved line;
the curved line having one end point that is at the center point (P1) and an opposite end point that is at the tangent point (P12), wherein the tangent point (P12) is a tangent point between the curved line and the channel axis (XL2), so that the curved line extends for a horizontal distance (L11), wherein the horizontal distance (L11) is equal to a distance between the center point (P2) and the tangent point (P12), the straight line segment having one end at the tangent point (P12) and an opposite end at the center point (P1), wherein (P12) and (P2) are spaced apart from each other by a horizontal distance which equals to a difference between the horizontal distance (L1) and the horizontal distance (L11);
a center of circle point (P0) being located on a vertical line (YL6) passing through the point (P12) so that a line segment (P0P12) extending between the point (P0) and the point (P12) and a line segment (P0P1) extending between the point (P0) and the point (P1) are isometric in length, and an included angle (2θ1) between the line segment (P0P12) and the line segment (P0P1) has a dimension equal to a dimension of the corner (A), wherein a dimension of a placement angle (θ1) is equal to a dimension of an angle of a line segment (P1P12) with respect to the horizon;
and the curved line and vertical line (YL1) including an included angle having a dimension (γ1) at the center point (P1) of the center hole, where γ1=90°−2θ1;
when the dimension of the included angle γ1≠0°, the center hole is a round hole having the diameter (d0) by reduction of the major axis (ax), wherein the reduction of the major axis (ax) is achieved by replacing the distal point (E1) with a distal point
E
1
*
on the major axis and replacing the proximal point (E2) with a proximal point
E
2
*
on the major axis;
the distal point (E3) having the height (LH4), the distal point (E3) having the height difference (H1) with respect to the the seal surface, the proximal point (E4) having the height (LH5);
(LH5);
a line segment (E3E4) extending between the distal point (E3) and the proximal point (E4) being the major axis (ay) of the internal outlet in the Y-axis direction, where (ay) equals a distance between the distal point (E3) and the proximal point (E4);
the outlet center line (S2) including a straight line segment and a curved line;
the curved line having one end point that is at the center point (P3) and an opposite end point that is a tangent point (P34), wherein the tangent point (P34) is a tangent point between the curved line and channel axis (XL2), so that the curved line extends for a horizontal distance (LL21) which is equal to a distance between the center point (P3) and the tangent point (P34), the straight line segment (P34P4) having one end at the tangent point (P34) and an opposite end point at the center point (P4), with a horizontal distance between the tangent point (P34) and the center point (P4) equal to LL2−LL21;
a center of circle point (P5) being located on a vertical line (YL5) that passes through the point (P34) so that a line segment (P5P34) extending between the point (P5) and the point (P34) and a line segment (P5P3) extending between the point (P5) and the point (P3) are isometric in length, and an included angle dimension (2θ1) between the line segment (P5P34) and a line segment (P5P3) is equal to a dimension of the corner (E), wherein a dimension of a placement angle (θ2) is equal to an angle of a line segment (P3P34) with respect to the horizon, and wherein the curved line and vertical line (YL3) include an included angle having a dimension (γ2) at the center point (P3) of the center hole, where γ2=90°−2θ2;
wherein the outlet center line (S2) includes a straight line segment and a curved line, wherein the outlet passage has a constant diameter and a constant cross-sectional area throughout a length thereof, where in the upper-edge line (S2a), the lower-edge line (S2b), and the outlet center line (S2) are parallel to each other and the three curved lines share the same center of the circle point (P5), the internal outlet being an oval hole having the major axis length (ay) equal to a distance (E3E4) between the between the distal point (E3) and the proximal point (E4), where the distance between the point (E3) and the point (Ps) exceeds the distance between the point (P3) and the point (E4), and has the minor axis length (bz), where bz=d0;
the upper-edge line (S2a) intersecting the vertical line (YL5) at a tangent point (E35), which has a height of d0/2, a line segment (P5P35) extending between the point (P5) and the point (E35) and a line segment (P5E3) extending between the point (P5) and the point (E3) forming therebetween an included angle having a dimension (2θ21), and wherein the curved line and vertical line (YL3) including form therebetween an included angle having a dimension (γ21) at the distal point (E3), where γ21=90°−2θ21, a value of the height (LH4) of the distal point (E3) being obtainable using the upper-edge line (S2a);
the lower-edge line (S2b) intersecting the vertical line (YL5) at a tangent point (E46) which has a height of
-
d
0
2
,
a line segment (P5E46) extending between the point (P5) and the point (E46) and a line segment (P5E4) extending between the point (P5) and the point (E4) including therebetween an included angle having a dimension of (2θ22), and the lower-edge line (S2b) and the vertical line (YL3) including therebetween an included angle having a dimension of (γ22) at the proximal point (E4), where γ22=90°−2θ22;
a value of the height (LH5) of the proximal point (E4) being obtainable using the passage and lower-edge line (S2b);
whereby the rushing stream (S121) and the tranquil stream (S122) separate and flow at the ring-shaped ditch to minimize flow interference in the valve chamber and flow interference at the internal outlet, and the corner (E) of the upper-edge line (S2a) of the outlet passage has a dimension angle of (2θ21), where 30°≤2θ21≤90°.

183 more elements

Flow channel for globe valve

Life of this patent

Flow channel for globe valve

Life of this patent

Abstract

Claims19