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JP-2026075039-A - Global valve valve body flow path

JP2026075039AJP 2026075039 AJP2026075039 AJP 2026075039AJP-2026075039-A

Abstract

[Problem] To provide a valve body flow path for a global valve with a low head loss coefficient ξ that meets ESG requirements. [Solution] A valve inlet and a valve outlet are installed on both sides of the valve body, and a valve plug and valve seat provided in the valve chamber open and close. The inlet flow path includes the valve inlet and an inlet center line S1 which is a smooth streamline, into which the fluid flows horizontally, then is turned upward at a turning angle A of 55° ≤ 2θ ≤ 105° and flows out from the central hole of the valve seat. The outlet flow path includes the valve outlet, an inner outlet, and an outlet center line S2 which is a smooth streamline that is angled downward. When the valve plug is opened, a radial flow path is formed between the bottom of the valve plug and the valve seat, the fluid flows out from the central hole, is turned at a turning angle B, enters the radial flow path, undergoes radial flow and diffuses C, and includes a jet S 121 and a slow flow S 122 , enters the inner outlet at a turning angle D and mixes in the outlet flow path, and flows out from the valve outlet at a turning angle E of 30° ≤ 2θ ≤ 90°. [Selection Diagram] Figure 6A

Inventors

  • 簡 煥然
  • 陳 柏文
  • 洪 煥喬

Assignees

  • 和正豐科技股▲分▼有限公司

Dates

Publication Date
20260507
Application Date
20250530
Priority Date
20241021

Claims (18)

  1. A valve body passage having a low head loss coefficient ξ that conforms to ESG requirements, wherein the structure of the valve body passage comprises a valve chamber, an annular groove, a valve seat, a valve plug, a sealing surface, a valve inlet, an inlet passage, a central hole, a valve outlet, an outlet passage, and an inner outlet, The valve chamber diameter is d3 , the valve plug outer diameter is d2 , the valve seat outer diameter is d1 , the valve inlet diameter, valve outlet diameter, and central hole diameter are all d0 , the sealing surface of the valve seat is located outside the central hole, the height of the center point P1 of the central hole is LH1 , the height of the center point P3 of the inner outlet is LH2 , the height of the sealing surface of the valve seat is LH3 , and a sealing convex ring is provided, the valve inlet has a center point P2 , and the valve outlet has a center point P4 . The horizontal line XL1 passes through the center point P1 of the central hole, and the horizontal line XL1 and the circumference of the central hole intersect at two points: the distal point E1 located on the valve inlet side and the proximal point E2 located on the valve outlet side. The pipe axis XL2 (X-axis) passes horizontally through center point P2 and center point P4 , and the height indicator is based on the pipe axis XL2 connecting the valve outlet and the valve inlet. When the zero point of the Y-axis coordinate indicates the position relative to the pipe axis XL2 , there are positive values (>0), zero values (=0), and negative values (<0). The vertical line YL 1 passes through the center point P 1 and intersects with the pipe axis XL 2 at intersection point P 11 . The vertical line YL2 passes through the center point P4 , and the vertical line YL2 and the circumference of the valve outlet intersect each other at two points: the distal point E5 and the proximal point E6, which is the lowest point of the outlet flow path. The vertical line YL 3 passes through the center point P 3 of the inner outlet and intersects with the pipe axis XL 2 at intersection point P 31 , and the vertical line YL 3 and the circumference of the inner outlet intersect at two points, the distal point E 3 and the proximal point E 4 , with the height of the distal point E 3 being LH 4 and the height of the proximal point E 4 being LH 5 . The vertical line YL 4 is established passing through the center point P 2 , and the vertical line YL 4 and the circumference of the valve inlet intersect each other at two points: the distal point E 7 and the proximal point E 8 , which is the lowest point of the inlet flow path. There is a horizontal distance L1 between center point P1 and center point P2 , satisfying the condition P11 P2 = L1 , there is a horizontal distance L2 from center point P4 to center point P1 , satisfying the condition P4 P11 = L2 , there is a horizontal distance L from center point P2 to center point P4 , satisfying the condition P4 P2 = L = L1 + L2 , there is a horizontal distance LL2 from center point P4 to center point P3 , satisfying the condition LL2 = L2 - d3 /2, The valve seat has the annular groove, the valve plug, the valve stem, and the sealing surface installed inside it, and the valve plug, the valve stem, and the sealing surface are concentric, and the valve seat is used to connect the inlet passage and the outlet passage, the inlet passage enters from the horizontal valve inlet and is bent upward, and its outlet end is the central hole of the valve seat, the inner outlet installed on the inner diameter surface of the valve seat is used to connect to the outlet passage, the valve inlet and the valve outlet are installed on both sides of the valve body, and when the outlet passage is a straight pipe or a curved pipe of a diagonal downward type, the inner outlet may be a non-standard ellipse, The annular groove is located within the valve chamber diameter and surrounds the outer diameter of the valve seat, the bottom of the annular groove is a slope with an angle β, the higher side of the slope is located on the side of the inlet passage, the lower side of the slope is located on the side of the outlet passage, and is connected to the proximal point E 4 of the inner outlet. The valve seat is installed at the outlet end of the inlet passage and has the sealing surface provided. The valve plug is cylindrical and has a flat surface at its bottom. When the global valve is closed, the valve plug is used to seal with the sealing surface. When the valve is fully open, a radial flow path with an opening of B 1 is formed between the bottom surface of the valve plug and the sealing surface, satisfying the condition 0.125 ≤ B 1 / d 0 ≤ 0.5. The inlet passage includes the valve inlet, the inlet center line S1 , the central hole, the upper edge line S1a , and the lower edge line S1b , and the inlet center line S1 connects the center point P1 , the center point PDP , and the center point P2 , and has an angle γ1 between the center point P1 and the vertical line YL1 , and when the angle γ1 ≠ 0°, the central hole is a non-standard elliptical hole, has a major axis ax in the X-axis direction, and satisfies the conditions ax ≥ d0 , ax = E1 E2 , and E1 P1 ≥ P1 E2 , and when the angle γ1 = 0°, the central hole is a circular hole with diameter d0 , has a minor axis bz in the Z-axis direction, and satisfies the condition bz = d0 , and the upper edge line S 1a connects the distal point E1 and the distal point E7 , and the lower edge line S1b connects the proximal point E2 and the proximal point E8 . The radial flow path includes a radial center line S12 and an opening B1 . When the valve is opened, the opening of the radial flow path, which consists of the bottom surface of the valve and the sealing surface, is set to B1 . The radial flow path surrounds the flow path radiating from the central hole, and the height of the radial flow path is set to LH6 , satisfying the condition LH6 = B1 + LH3 . The radial center line S12 connects center point P1 and center point P3 , and from center point P1 , fluid flows out in different directions in a radial manner and is finally connected to center point P3 . The outlet passage includes the inner outlet, the valve outlet, the outlet center line S2 , the upper edge line S2a , and the lower edge line S2b , and the outlet center line S2 connects center point P3 and center point P4 , and has an angle γ2 between center point P3 and the vertical line YL3 , satisfying the condition 0° ≤ γ2 < 90°, and when the inner outlet is a non-standard elliptical hole, it has a major axis ay in the Y-axis direction, satisfying the conditions ay ≥ d0 , ay = E3 E4 , E3 P3 ≥ P3 E4 , it has a minor axis bz in the Z-axis direction, satisfying the condition bz = d0 , and when the angle γ2 = 90°, the outlet passage is a horizontal straight pipe, satisfying the condition ay = d0 , and the upper edge line S 2a connects the distal point E3 and the distal point E5 , the lower edge line S2b connects the proximal point E4 and the proximal point E6 , the distal point E3 has a height difference H1 with respect to the sealing surface and satisfies the condition LH4 - LH3 = H1 , and when the distal point E3 is higher than the sealing surface, the condition H1 ≥ 0, and when it is lower than the sealing surface, the condition H1 ≤ 0 is satisfied, the center point P3 of the inner outlet has a height difference H3 with respect to the sealing surface and satisfies the condition LH2 - LH3 = H3 , and when the center point P3 is higher than the sealing surface, the condition H3 ≥ 0, and when it is lower than the sealing surface, the condition H3 ≤ 0 is satisfied, The radial gap B3 is located between the outer diameter d2 of the valve plug and the inner diameter d3 of the valve, satisfying the conditions B3 = ( d3 - d2 )/2 and 0.2 ≤ B3 /d0 ≤ 0.4. The annular space B2 is between the outer diameter d1 of the valve seat and the inner diameter d3 of the valve chamber, satisfying the conditions B2 = ( d3 - d1 )/2 and 0.25 ≤ B2 /d0 ≤ 0.4, with an inner diameter ratio of d3 / d0 , and the ratio of the inner diameter d3 to the valve inlet diameter d0 satisfying the conditions 1.75 ≤ d3 /d0 ≤ 2.8. The three centerlines, the inlet centerline S1 , the radial centerline S12 , and the outlet centerline S2, are defined as streamlines, and their bending angles are limited to those based on predictable geometric shapes. Further descriptions are obtained using 3D-CFD calculations. The inlet center line S1 is a single line segment or a combination of several line segments, which include a circular arc, a vertical line segment, a diagonal line segment, and a horizontal line segment; the vertical line segment is coaxial with the vertical line YL1 ; the horizontal line segment is coaxial with the pipe axis XL2 ; and the deflection angle A is the bending angle of the inlet center line S1 from the valve inlet to the central hole. The radial center line S12 is a streamline after the fluid has flowed out of the central hole, flowing radially in different directions and entering the radial flow path, the turning angle B is the bending angle between the inlet center line S1 and the radial center line S12 , all streamlines flow via the horizontal radial direction, the diffusion C flows toward the inner outlet, the radial center line S12 is such that the fluid velocity of the diffusion C slows down after the turning angle B is applied due to the increase in the area of the radial flow path, but accelerates when flowing toward the inner outlet after bending, and also accelerates due to the reduction in area, the radial center line S12 is influenced by the relative position between the sealing surface and the inner outlet, and is either a straight line, an arc, or a multi-curved arc. The radial center line S12 is driven by the pressure difference between the valve inlet and the valve outlet, and the radial center line S12 of the diffusion C is divided into a jet S121 and a slow flow S122 , and the dense streamline receiving the high pressure difference gradient is the jet S121 with a high flow velocity, and the dense streamline receiving the low pressure difference gradient is the slow flow S122 with a lower flow velocity than the jet S121 , and the streamlines of the diffusion C flow are fanned out in the circumferential direction and are affected by the turning angle B, the jet S121 is fanned out toward the inner outlet, and the slow flow S122 is fanned out at a circumferential angle other than the fanned out angle of the jet S121 , and the radial center line S12 is subjected to a turning angle D before the jet S121 and the slow flow S122 flow into the inner outlet, and the jet S 121 is given a turning angle D1 and slow flow S 122 is given a turning angle D2 The outlet center line S2 is a single line segment or a combination of several line segments, which include a circular arc, a diagonal line segment, and a horizontal line segment, the horizontal line segment is coaxial with the pipe axis XL2 , the turning angle D of the outlet center line S2 is the bending angle between the radial center line S12 and the outlet center line S2 , and the fluid flows out from the valve outlet after being subjected to a turning angle E in the inner outlet and the outlet flow path. The cross-section of the inlet passage, starting from the circumference of the valve inlet and extending along the inlet centerline S1 to the circular central hole with diameter d0 , has an upper edge line S1a and a lower edge line S1b . The aforementioned entrance center line S1 has a straight line segment and a circular arc curve, and a point of tangency P12 is taken with the pipe axis XL2 , the circular arc curve has one endpoint as the center point P1 and the other endpoint as the point of tangency P12 , the point of tangency P12 is the point of tangency between the circular arc curve and the pipe axis XL2 , the circular arc curve has a horizontal distance L11 and satisfies the condition L11 = P11 P12 , the straight line segment has one endpoint as the point of tangency P12 and the other endpoint as the center point P2 , and satisfies the condition that the horizontal distance between P12 P2 = L1 - L11 , and passes through point P12 to draw a vertical line YL6 , and the center point P0 is taken on the vertical line YL6 , so the line segment P0 P12 and the line segment P0 P The goal is to make 1 equal in length, and the angle 2θ1 between line segment P0 P12 and line segment P0 P1 is equal to the turning angle A, the mounting angle θ1 is equal to the horizontal angle between line segment P1 P12 , and the angle γ1 between the circular arc curve and the vertical line YL1 is obtained at the center point P1 of the central hole, satisfying the condition γ1 = 90° - 2θ1 . When the included angle γ1 ≠ 0°, the central hole is modified to be reduced from a non-standard elliptical hole to a circular hole with diameter d0 , the original major axis is ax , and the length of ax = E1 E2 is reduced to d0 , the reduction method is to take a distal point E1 * on the major axis instead of a distal point E1 , and a proximal point E2 * on the major axis instead of a proximal point E2, satisfying the condition E1 * P1 = P1 E2 * = d0 /2, the reduction ratio of the length of the major axis ax is d0 / ax , satisfying the condition d0 / ax = d0 / E1 E2 , and the reduction ratio of the length of the major axis ax is d0 / ax , satisfying the condition 0.7 ≤ d0 / ax ≤ 1.0, The distal point E3 has a height LH4 , and the height difference between the distal point E3 and the sealing surface is H1 , the proximal point E4 has a height LH5 , the line segment E3 E4 is the major axis ay in the Y-axis direction of the inner outlet, and the condition ay = E3 E4 is satisfied, The aforementioned exit center line S2 has a straight line segment and a circular arc curve, and a point of tangency P34 is taken with the pipe axis XL2 , the circular arc curve has one endpoint as the center point P3 and the other endpoint as the point of tangency P34 , the point of tangency P34 is the point of tangency between the circular arc curve and the pipe axis XL2 , the circular arc curve has a horizontal distance LL21 and satisfies the condition LL21 = P31 P34 , the aforementioned straight line segment has one endpoint as the point of tangency P34 and the other endpoint as the center point P4 , and satisfies the condition horizontal distance P34 P4 = LL2 - LL21 , and draws a vertical line YL5 passing through point P34 , and the center point P5 is taken on the vertical line YL5 , so the line segment P5 P34 and the line segment P5 P The following conditions must be met: 3 can be made equal in length, the angle 2θ2 between line segment P5 P34 and line segment P5 P3 is equal to the turning angle E, the mounting angle θ2 is equal to the horizontal angle 3 of line segment P3 P34 , and the angle γ2 between the circular arc curve and the vertical line YL3 is obtained at the center point P3, satisfying the condition γ2 = 90° - 2θ2 ; and when the outlet center line S2 consists of a straight line segment and a circular arc curve, the outlet flow path is maintained with a cross-sectional area of equal diameter, its upper edge line S2a , lower edge line S2b and the outlet center line S2 are all parallel to each other, the three circular arc curves have a common center point P5 , and the inner outlet is a non-standard elongated ellipse, the major axis ay of the non-standard elongated ellipse is E3 E4 , and E3 The condition P3 > P3E4 is satisfied, and the minor axis bz = d0 of the non-standard elongated ellipse, The upper edge line S2a and the vertical line YL5 intersect at the point of junction E35 , with the height of the point of junction E35 being d0/2, the angle between line segment P5E35 and line segment P5E3 being 2θ21 , and the angle γ21 between the circular arc curve and the vertical line YL3 is obtained at the distal point E3 , satisfying the condition γ21 = 90° - 2θ21 , and the height value LH4 of the distal point E3 can be obtained via the upper edge line S2a , The lower edge line S2b and the vertical line YL5 intersect at the point of junction E46 , with the height of the point of junction E46 being -d0/2, the angle between line segment P5E46 and line segment P5E4 being 2θ22 , and the angle γ22 between the lower edge line S2b and the vertical line YL3 is obtained at the proximal point E4 , satisfying the condition γ22 = 90° - 2θ22 , and the height value LH5 of the proximal point E4 can be obtained via the lower edge line S2b . The valve body flow path of a global valve is characterized in that the jet S121 and slow flow S122 enable layered flow in the annular groove, reduce flow interference within the valve chamber and flow interference at the inner outlet, and satisfy the condition that the angle of the deflection angle E of the upper edge line S2a of the outlet flow path is 2θ21 and 30° ≤ 2θ21 ≤ 90°.
  2. The valve body flow path of the global valve according to claim 1, characterized in that the center point of the central hole has a height LH 1 with respect to the pipe axis XL 2 , and the angle 2θ 1 of its deflection angle A satisfies the condition 55° ≤ 2θ 1 ≤ 105°.
  3. The valve body flow path of a global valve according to claim 1, characterized in that the jet S 121 is subjected to a first deflection angle D1 when the diffusion C flows to the annular groove, and a second deflection angle D1 when it passes through the distal point E 3 , and the angle γ 21 satisfies the condition 0° ≤ γ 21 ≤ 60°.
  4. The valve body flow path of the global valve according to claim 1, characterized in that the proximal point E 4 has a height of LH 5 and is connected to the bottom of the slope of the annular groove, and satisfies the condition -0.4 ≤ LH 5 / d 0 ≤ 0.4.
  5. The valve body flow path of a global valve according to claim 1, characterized in that the angle 2θ 22 of the deflection angle E of the lower edge line S 2b of the outlet flow path satisfies the condition 14° ≤ 2θ 22 ≤ 54°.
  6. The valve body flow path of the global valve according to claim 1, characterized in that when the height difference ratio H 1 / d 0 satisfies the condition H 1 / d 0 ≤ 0.5, the condition LH 6 ≈ LH 3 + B 1 is satisfied, the height difference between the reflection point E 3 * and the valve seat is H 1 * , the condition H 1 * ≈ B 1 is satisfied, the jet S 121 flows into the inner outlet between the reflection point E 3 * and the center point P 3 , the mounting angle θ 21 * of the reflection point E 3 * is equal to the horizontal angle of the line segment E 3 * E 35 , and the condition 2θ 21 * ≤ 2θ 21 is satisfied.
  7. The valve body flow path of a global valve according to claim 1, characterized in that the angle β of the inclined surface of the annular groove approximates the included angle θ 22 and satisfies the condition 8° ≤ β ≤ 20°.
  8. The valve body flow path of the global valve according to claim 1, characterized in that the radial flow path includes the inner concave surface of the bottom of the valve plug and the sealing surface of the valve seat.
  9. In the aforementioned outlet channel, the inner outlet is maintained in a non-standard ellipse shape, and the outlet center line S2 , the upper edge line S2a , and the lower edge line S2b of the outlet channel are changed to a combination of straight line segments, with line segment P3 P34 connecting the center point P3 and the phase contact point P34 , line segment E3 E35 connecting the distal point E3 and the phase contact point E35 , and line segment E4 E46 connecting the proximal point E4 and the phase contact point E46 , and the cross-section of the inner diameter curved surface of the outlet channel from the circumference of the non-standard ellipse of the inner outlet along the outlet center line S2 to the circular valve outlet has an upper edge line S2a and a lower edge line S2b , and passes through point P34 to draw a vertical line YL5 , and by taking point P5 on the vertical line YL5 , line segment P5 P The valve body flow path of a global valve according to claim 1 , characterized in that 34 and line segment P5P3 can be made equal in length, and the angle 2θ2 between line segment P5P34 and line segment P5P3 is equal to the turning angle E of line segment P3P34 , and the mounting angle θ2 is equal to the horizontal angle of line segment P3P34 .
  10. The shape of the inner outlet is modified from the non-standard ellipse to a rectangle, the non-standard ellipse being inscribed within the rectangle, both having the same major axis a/ y and the same minor axis b /z , and having the same distal point E3 and the same proximal point E4 , the four right angles of the rectangle being modified to small rounded angles, the outlet center line S2 , the upper edge line S2a , and the lower edge line S2b of the outlet flow path being changed to a combination of straight line segments, line segment P3 P34 connecting the center point P3 and the phase contact point P34 , line segment E3 E35 connecting the distal point E3 and the phase contact point E35 , line segment E4 E46 connecting the proximal point E4 and the phase contact point E46 , and starting from the inner outlet, the outlet center line S The cross-section of the inner diameter curved surface of the outlet passage along 2 up to the circular valve outlet has an upper edge line S 2a and a lower edge line S 2b , passes through point P 34 to draw a vertical line YL 5 , and by taking point P 5 on the vertical line YL 5 , the line segments P 5 P 34 and P 5 P 3 can be made equal in length, and the angle 2θ 2 between the line segments P 5 P 34 and P 5 P 3 is equal to the turning angle E of the line segment P 3 P 34 , and the mounting angle θ 2 is equal to the horizontal angle of the line segment P 3 P 34 , characterized in that, the valve body passage of the global valve according to claim 1.
  11. The mounting angle of the line segment P3 P34 is θ2 , and the turning angle D of the center point P3 is θ2 , satisfying the condition θ2 = Atan( LH2 / LL21 ). The mounting angle of the line segment E3 E35 is θ21 , and the turning angle D of the distal point E3 is θ21 , satisfying the condition θ21 = Atan(( LH4 - d0 /2)/ LL21 ). The mounting angle of the line segment E4 E46 is θ22 , and the turning angle D of the proximal point E4 is θ22 , satisfying the condition θ22 = Atan(( LH5 + d0 /2)/ LL21 ). The exit center line S2 is the phase contact point P The first bend at point 34 is given by a turning angle E, so the turning angle E = θ² , and the upper edge line S2a is given by a turning angle E at point 35 , so the turning angle E = θ² , and the lower edge line S2b is given by a turning angle E at point 46 , so the turning angle D = θ², and the turning angle D of the distal point E3 is θ² , satisfying the condition 14 ° ≤ θ²¹ ≤ 45°, the turning angle E of point 35 is θ² , and satisfying the condition 14° ≤ θ²¹ ≤ 45°, the turning angle D of the proximal point E4 is θ² , and satisfying the condition 7° ≤ θ²² ≤ 20°, and the turning angle E of point 46 is θ² , and 7° ≤ θ²² The valve body flow path of the global valve according to claim 9 or claim 10, characterized in that it satisfies the condition of ≤20°.
  12. When it is necessary to adjust the height H1 of the distal point E3 of the ellipse, a portion of the circular arc S3 is provided on the upper edge line S2a of the outlet flow path, and the vertical line YL3 and the new distal point E3 ** intersect with each other, and the angle γ21 ** of the circular arc S3 at the distal point E3 ** satisfies the condition 30° ≤ γ21 ** ≤ 90°, and a tangent curved surface SS is created between the inner diameter upper edge curved surface of the outlet flow path created along the circular arc S3 , so that when a portion of the jet S121 enters the inner outlet directly, it can flow along the tangent curved surface SS, and the angle θ21 ** of its deflection angle D1 is reduced, satisfying the condition 0° ≤ θ21 ** ≤ 60°, the valve body flow path of the global valve according to claim 1.
  13. The valve body flow path of the global valve according to claim 12, characterized in that there is a height difference H 1 ** between the distal point E 3 ** and the valve seat, satisfying the conditions H 1 ** ≥ B 1 and 0.5 ≥ H 1 ** / d 0 ≥ 0.25, and the new major axis of the ellipse is a y ** , satisfying the condition 2d 0 ≥ a y ** ≥ 1.3d 0 .
  14. In the inlet and outlet passages, the inner outlet is maintained in a non-standard elliptical shape, and the valve chamber diameter d3 and the valve seat outer diameter d1 are designed to be eccentric, thereby creating a hollow circular eccentric structure for the valve chamber. The valve chamber is divided into a valve plug chamber with a diameter of 1.8d0 and an annular chamber with a diameter of 2.2d0 , with a concentricity deviation between the valve plug chamber and the annular chamber of 0.2d0 , and the height of the top of the interior of the annular chamber being LH7 . The valve plug chamber and the valve seat are concentrically arranged so that a vertical line YL1 passes through them, and the valve plug chamber is used to receive the valve plug. The horizontal distance between the center point P1 of the valve seat on the valve inlet side and the inner diameter of the annular chamber is 0.9d0 , and the horizontal distance between the center point P1 of the valve seat and the inner diameter of the annular chamber on the inner outlet side is 1.3d The valve body flow path for a global valve according to claim 1 , characterized in that the annular chamber receives the annular space and the annular groove, the width of the annular groove changes according to the eccentric design so that it has the maximum width on the inner outlet side, there is a height difference H 5 between the top of the inside of the annular chamber and the sealing surface of the valve seat, and the conditions H 5 = LH 7 - LH 3 and 0.6 ≥ H 5 / d 0 ≥ 0.25 are satisfied.
  15. When the height LH 4 of distal point E3 is higher than the height LH 7 , the condition LH 4 > LH 7 is satisfied. In this case, it is necessary to find a new distal point E3 ** on the major axis a y , and a portion of the circular arc S 3 is drawn from distal point E3** to be tangent to the upper edge line S 2a , and the height difference between distal point E3 ** and the sealing surface of the valve seat is ensured to satisfy the condition 0.25d 0 ≤ H 1 ** ≤ 0.5d 0 , and the major axis formed by the line segment E3 ** E4 is defined as a y ** , and a tangent curved surface SS is created between the inner diameter surface of the outlet flow path created along the circular arc S 3 , and the angle γ 21 ** between the circular arc S 3 and the vertical line YL 3 at distal point E3 ** is 30° ≤ γ 21 ** The valve body flow path of the global valve according to claim 14, characterized in that it satisfies the condition ≤ 90°, the angle of the deflection angle D of the distal point E 3 ** is θ 21 ** , the condition 0° ≤ θ 21 ** ≤ 60° is satisfied, the new major axis of the ellipse is a y ** , and the condition 2.0d 0 ≥ a y ** ≥ 1.3d 0 is satisfied.
  16. The valve body flow path of a global valve according to claim 1, wherein the sealing surface of the valve seat is located outside the central hole, a conical tube coaxial with the vertical line YL 1 is installed on the central hole, the conical tube has a center point P DP , the height of the sealing surface of the valve seat is LH 3 , the height of the central hole is LH 1 , the height h of the conical tube has a conical angle φ, and satisfies the condition LH 3 = LH 1 + h, the function of the conical tube is to provide a diffusion effect for the fluid and its inlet center line S 1 , the deflection angle B can be further smoothed to allow entry into the radial flow path, the head loss can be further reduced, and the conical tube increases the structural strength of the valve seat and enhances the reliability of the seal.
  17. The valve body flow path for a global valve according to claim 16, characterized in that the height h of the conical tube satisfies the condition 0.06 ≤ h/d 0 ≤ 0.2, and the conical angle φ of the conical tube satisfies the condition 15° ≤ φ ≤ 60°.
  18. The valve body flow path of a global valve according to claim 1, characterized in that vertical rib plates are added to the outer diameter surface of the valve seat to reinforce the strength of the valve seat, the vertical rib plates are located on the side of the inner outlet, their lower portions are connected to the bottom of the annular groove, both sides of the vertical rib plates are vertical arcuate surfaces, one side of each arcuate surface on both sides is in contact with the outer diameter surface of the valve seat to form a wide bottom side, the other sides of each arcuate surface on both sides intersect to form an end with a small arcuate angle, and the vertical rib plates act as guides for streamlines that branch out from the annular groove and flow toward the inner outlet.

Description

Global Valve offers control valves commonly used in pipeline systems, featuring high sealing reliability, ease of flow adjustment, and cleanliness/residue-free operation, making them widely popular. Diaphragm valves, in particular, are especially well-suited for high-cleanliness applications and can be used to limit flow or pressure in pipeline systems. However, their drawback is that achieving the same flow rate requires a relatively high pressure difference. Commonly seen valves can be distinguished using obturators. The first type seals using an elastic member, such as a pinch valve or wear valve. The second type seals using a swivel member, such as a butterfly valve or ball valve. The third type seals using a sliding member, such as a gate valve. The fourth type seals using a cover/shielding member, such as a global valve or needle valve. The fifth type seals by deformation using an elastic piece, such as a wear valve. The flow performance of the five types of valves described above may be described using dimensional flow coefficients CV and KV , or using the dimensionless pressure loss coefficient ξ. For related definitions, please refer to Reference 2 (Chapter 1, General Information, 1-1 General Guidelines, Term 8 and Term 9, P. 2). Among these, the larger the CV value, the greater the flow rate and the smaller the resistance, while the larger the ξ value, the greater the resistance and the smaller the flow rate. The following CV value refers to the situation where the valve body flow path has the maximum flow rate when the 2-inch bore is 47 mm to 57 mm and the obturator is fully open. The range of flow coefficient CV values for the first type of valve, a pinch valve, is 170 to 280, and the range of flow coefficient CV values for a weir valve is 50 to 120. The second type of valve: The flow coefficient CV value range for butterfly valves is 90 to 220, and the flow coefficient CV value range for ball valves is 210 to 500. The obturator of a ball valve is the central hole of the occluding spherical material. If the diameter of the central hole and the diameter of the valve inlet and outlet are the same, it is called a full-port valve and has the characteristics of a high flow coefficient CV value. Because the flow path of the valve body is in the shape of a straight pipe, the streamlines are straight during fluid flow and are hardly obstructed, so its CV value can reach up to 500. If the central hole is small, the CV value will also be small, and it may be as low as 210 . The range of the flow coefficient CV value for the third type of valve, a gate valve, is 100 to 300. Fourth type of valve: The range of the flow coefficient CV value for a vertical-axis global valve is 30 to 65. When the inlet and outlet are aligned in a straight line, referring to Figure 1, p. 2 of Reference 3, the range of the CV value is 40 to 60. Taking an example of a valve with an inner diameter of 52.5 mm, the range of the head loss coefficient ξ is 4.5 to 10.13. When the inlet and outlet are at a right angle, the range of the CV value is 60 to 100. The CV values of each type of valve described above are still affected by the actual pipe diameter, requiring the actual pipe diameter when comparison is necessary. Furthermore, differences in CV values for the same pipe diameter indicate the presence or absence of obstruction to the streamlines depending on the change in the flow path cross-sectional area of the valve body, and in particular, the larger the radius of curvature of the streamlines, the higher the CV value. In addition, the range of CV values caused by structural differences in application needs varies from factory to factory, but Y-shaped global valves are not included here. The fifth type of valve, a weir valve, has a flow coefficient CV value ranging from 50 to 116. References 5 and 6 show that while the sealing of a weir valve is relatively difficult to achieve in terms of high-reliability sealing needs because it completes the sealing using a single sealing curve, both its outlet and inlet passages can form smooth curved lines, and many CV values can reach 60 to 80. The patents in Reference 5 and Reference Case 9 are designed so that the CV value can reach the level of 110 to 116, with a pipe diameter of 57 mm and a head loss coefficient ξ of 1.7, while Reference 6 has a pipe diameter of 47.8 mm and a head loss coefficient ξ of 4.47. The goal of this innovation in valve body flow path is to improve the internal flow path of a vertical-axis global valve. Instead of the well-known and conventional CV value, a dimensionless head loss coefficient ξ is used as the improvement indicator. The inlet and outlet are set to a straight line of 2 inches (52.5 mm), and the content of the innovation is explained using the global valve as the target. The goal of the innovation is an improvement over the conventional valve body flow path. For example, if the inner diameter of the 2-inch valve is 52.5 mm and the inner diameter rati