WO2020122233A1 - 仕切弁 - Google Patents
仕切弁 Download PDFInfo
- Publication number
- WO2020122233A1 WO2020122233A1 PCT/JP2019/048968 JP2019048968W WO2020122233A1 WO 2020122233 A1 WO2020122233 A1 WO 2020122233A1 JP 2019048968 W JP2019048968 W JP 2019048968W WO 2020122233 A1 WO2020122233 A1 WO 2020122233A1
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- WIPO (PCT)
- Prior art keywords
- valve
- branch
- valve box
- box
- flow path
- Prior art date
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/46—Mechanical actuating means for remote operation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
- F16K3/12—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with wedge-shaped arrangements of sealing faces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/04—Construction of housing; Use of materials therefor of sliding valves
- F16K27/044—Construction of housing; Use of materials therefor of sliding valves slide valves with flat obturating members
- F16K27/047—Construction of housing; Use of materials therefor of sliding valves slide valves with flat obturating members with wedge-shaped obturating members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
- F16K3/0254—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor being operated by particular means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/50—Mechanical actuating means with screw-spindle or internally threaded actuating means
Definitions
- the present invention relates to a sluice valve, and more particularly, to a wedge sluice valve that divides a flow in a flow path by a wedge-shaped valve element to stop or flow a fluid and a rib setting method for the valve box.
- a wedge-shaped valve seat is provided in a direction orthogonal to the flow path in the valve box, and a cylindrical branch portion branched from the valve box is provided for the wedge-shaped valve seat.
- a wedge-shaped valve element connected to the valve stem is reciprocated to open and close the flow path.
- the wedge-shaped valve disc is mounted so that it moves up and down with the rotation of the valve stem when it is not fixed to the valve stem, and when the valve is closed, the valve seat surface on the valve disc side becomes the valve seat on the valve box side. It comes into contact with them and enters the deadline. After the valve is closed, the valve body moves in the sealing direction with respect to the valve rod by the fluid pressure, and the valve body side valve seat surface is pressed against the valve box side valve seat to seal the fluid.
- valve box of the sluice valve When the valve box of the sluice valve is installed, it is designed to meet the standards such as JIS in order to secure the strength. At that time, for reasons such as weight reduction of valves, molding workability, and cost of materials, it is required to be manufactured with the minimum wall thickness so as not to add extra thickness as much as possible while satisfying the standard. ..
- a sluice valve valve box of Patent Document 1 As a valve box used for such a sluice valve, for example, a sluice valve valve box of Patent Document 1 is disclosed.
- This valve box is formed of a steel plate, and an arcuate rib is provided in the vicinity of the boundary with the branch portion on the outer peripheral side of the valve box body.
- the arcuate ribs are provided within a range of an angle of elevation of 45° from the center of the valve seat.
- ribs are provided at the corners where the outer peripheral surface of the body of the valve box body and the outer surface of the valve body housing intersect.
- the ribs are provided on the first rib body extending from the axial direction of the valve rod, which is the branch portion side, along the axial direction of the body, and on both sides of the first rib body on the outer peripheral surface of the body.
- a second rib body is provided, and the strength of the valve box is secured by these first and second rib bodies to disperse the stress.
- wedge-type sluice valves are provided with ribs and protrusions on the valve box, which is required to be thinned, and these prevent deformation and bending of the valve box to prevent valve body and valve closing. There is a case where the wedge action with the seat is secured and the sealing property is improved.
- the strength of the valve box may be insufficient and the pressure resistance may drop when the valve is closed under high pressure.
- the wedge-shaped valve seat surface of the valve box may be deformed to widen, and the wedge angle of the valve box side valve seat may not match the valve body side valve seat surface. ..
- the surface pressure applied to the seal surface of the valve body side valve seat surface and the valve box side seat surface becomes non-uniform, and there are places where the surface pressure is insufficient, the sealing performance deteriorates and valve seat leakage occurs. Easier to do.
- an arcuate rib is provided in the vicinity of the boundary with the branch portion on the outer peripheral side of the valve box main body, but the arcuate rib is at an angle of elevation of 45° from the center of the valve seat inside and outside. It is formed with a uniform thickness in a part of the range.
- the weight of the rib portion tends to increase more than in Patent Document 1.
- the first rib is formed upright from the valve rod side to the body portion, and the second rib is formed in a flat shape on the outer peripheral surface of the body portion, it also leads to deterioration of castability. ..
- the whole valve is often made of metal as a measure against ultra-low temperature, and the valve box side valve seat and the valve body side valve seat surface are sealed by metal touch.
- metal is hard and difficult to deform, so if the valve seat is deformed due to insufficient rigidity of the valve box, the valve body cannot follow it and contact surface pressure of the deformed part is insufficient. .. If there is a portion where the contact surface pressure is insufficient on the sealing surface, it tends to leak from that portion.
- the deformation of the valve seat on the valve box side has a much larger effect on the sealing performance than a valve used under temperature conditions such as room temperature, resulting in insufficient rigidity of the valve box. If it is present, the sealing property will be severely deteriorated and leakage will occur easily.
- sluice valves There are two types of sluice valves, one is a solid type with high rigidity and the other is a flexible type that has a cut in the opening/closing direction and can be deformed to some extent.
- a solid type with high rigidity there is a possibility of unexpected deformation of the valve box compared to normal temperature conditions, and it is preferable to use a flexible type valve element to improve the followability to the valve box side valve seat.
- a flexible type valve element to improve the followability to the valve box side valve seat.
- the metal is harder than at room temperature. Therefore, it is difficult to deform the valve body so that the valve body is deformed.
- the valve part may be deformed so that the notch in the lower part is widened.
- the valve part in order to obtain a uniform surface pressure over the entire circumference of the sealing surface, it is necessary to consider both the valve seat and the valve body and adjust the deformation, which is not easy at all.
- the present invention was developed in order to solve the conventional problems, and the purpose thereof is to reduce the excess meat to reduce the weight and improve the castability while ensuring the strength and the high rigidity.
- a wedge-type sluice valve that includes a valve box, prevents deformation of the valve seat surface of the valve box when the valve is closed, ensures surface pressure sealing with a valve element, and reliably prevents leakage.
- the invention according to claim 1 is such that a branch portion is formed in an opening in a direction orthogonal to an internal flow path of a valve box having joint portions on both sides, and the valve body is formed from this branch portion via a valve rod.
- Is a sluice valve that moves up and down to open and close the annular valve seat surface in the valve box, and has a substantially cylindrical shape at the boundary between the joint portion and the branch portion or a diameter that gradually decreases from the branch portion toward the joint portion.
- a conical or substantially frusto-conical reinforcing pad is provided, and this pad is eccentric to the branch side from the center line of the channel and is parallel or intersects with the center line of the channel.
- Is a sluice valve having a cylinder, a cone, or a truncated cone having a rotation axis as a contour.
- the invention according to claim 2 is a sluice valve in which the rotation axis is eccentric at a predetermined distance from the base point to the intersection of the bottom surface of the cone and the center line of the flow path, and to the branch portion side.
- the invention according to claim 3 is a sluice valve in which the rotary shaft is eccentric to the branch side so that the contact point between the rotary shaft and the valve seat surface is at a distance of 5 to 10 mm from the center line of the flow path.
- a branch portion is formed in an opening in a direction orthogonal to an internal flow path of a valve box having joint portions on both sides, and the valve body moves up and down through the valve rod from the branch portion to move the valve box.
- a sluice valve that opens and closes an annular valve seat surface inside, and has a substantially cylindrical shape at the boundary between the joint portion and the branch portion, or a substantially conical shape or a substantially frustoconical shape that gradually reduces in diameter from the branch portion toward the joint portion.
- the reinforcing portion having a substantially cylindrical shape at the boundary between the joint portion and the branch portion, or a substantially conical shape or a substantially truncated cone shape having a diameter gradually reduced from the branch portion toward the joint portion side.
- This flesh portion is a cylinder or a cone that is eccentric to the branch portion side from the center line of the valve seat surface in the flow path direction, and that has a rotation axis that is parallel to or intersects with the flow path center line.
- the truncated cone is formed as the outer shape, for example, the bottom surface side of the conical meat part is provided in a shape that is offset to the branch part side, and the wall thickness of the bottom part of the meat part is the valve box bottom side.
- a valve box can be constructed. Even if the high pressure fluid flows when the valve is closed and the internal pressure becomes high, the entire wall is reliably prevented from deforming, especially around the upper part of the valve seat surface, which is particularly liable to be deformed by the walled part, and the valve seat surface of the valve box and the valve It is possible to reliably prevent leakage by uniformly sealing the surface of the body with the valve seat portion.
- this ultra-low temperature fluid prevents the valve box from expanding and contracting and deforming the metal valve seat surface, and seals the metal seat between this valve seat surface and the valve seat seal surface.
- the sealing property is secured as well as the normal temperature fluid.
- the eccentric reinforcing pad portion as in the present invention is provided. Since the deformation of the valve box side can be suppressed as much as possible, it is not necessary to consider the deformation of the valve seat so much, and it becomes easy to obtain a uniform surface pressure seal even when a flexible type valve body is used. ..
- the reinforcing wall portion increases the strength of the upper (branch portion) side where deformation easily occurs, and forms a highly rigid valve box as a whole. can do.
- FIG. 1 shows an embodiment of a sluice valve of the present invention
- FIG. 2 is a longitudinal sectional view of a valve box of the sluice valve of FIG. 1
- FIG. 3 shows a main portion of the valve box.
- a sluice valve of the present invention (hereinafter, referred to as a valve body 1) is composed of a wedge sluice valve, and is used, for example, in the production of LNG (liquefied natural gas), an ethylene plant, an industrial low temperature gas passage. It is suitable for opening and closing, and especially for ultra-low temperature fluids of about -50°C to -196°C.
- the valve body 1 has a valve box 2, a valve rod 3, and a valve body 4, which are made of a material having excellent low temperature characteristics, and are made of stainless steel or a stainless alloy such as stainless steel in this embodiment. ..
- the valve box 2 is formed, for example, by casting, and has an internal flow path 10, joint parts 11 on both sides, and a branch part 12.
- the joint portion 11 is formed in a substantially cylindrical shape, and in this example, a flange portion 13 is formed on the end side, and an external pipe (not shown) can be connected to the flange portion 13.
- the branch part 12 is formed so as to open to the upper side of the valve box 2 between the joint parts 11, 11 and the inside of the branch part 12 and the flow path 10 are in communication with each other.
- a valve body accommodating portion 14 is formed in a lower central portion of the valve box 2 so as to project downward, and the valve body accommodating portion 14 is provided so as to be able to accommodate the bottom side of the valve body 4 when the valve is closed. In the vicinity of the boundary between the joint portion 11 and the branch portion 12, a reinforcing pad portion 20 described later is provided.
- Annular valve seat surfaces 21, 21 are formed at seal positions on the primary side and the secondary side of the valve body 4 of the valve box 2, and these valve seat surfaces 21 flow in the cross-sectional direction of FIGS. 2 and 3. It is inclined toward the branch portion 12 side at an angle of about 6 to 10° from the center line P1 of the passage 10 and is provided in an inverted V shape by both valve seat surfaces 21 and 21.
- Each valve seat surface 21 is made of a metal sheet integrally formed in the valve box 2, and its front surface side is subjected to highly accurate seat surface finishing. Thereby, a stable sheet sealing property is exhibited at the time of metal contact with the valve body 4.
- a male screw 22 is formed on the outer periphery of the valve rod 3, and the valve rod 3 is attached to the valve box 3 by screwing the male screw 22 and a female screw 24 formed on a lid 23 described later. Mounted so that it can be moved up and down.
- a valve body 4 is mounted on the tip side of the valve rod 3, and the valve body 4 moves up and down together with the valve rod 3.
- the valve body 4 may be moved up and down by other operations.
- a male screw is formed on the outer periphery of the valve rod 3 near the drive unit 31, and a sleeve provided with an internal screw thread to be engaged with the male screw of the valve rod 3 on the inner peripheral side is disposed inside the drive unit 31 and a handle is provided.
- the sleeve may rotate with the rotation of 32.
- the sleeve is rotated by the rotation of the handle 32, and the valve rod 3 screwed into this sleeve can be moved up and down in a non-rotating state.
- Both sides of the valve body 4 are formed in a wedge shape capable of abutting and sealing the valve box valve seat surface 21, and are attached to the valve rod 3 via the uneven mounting portions.
- the valve body 4 and the valve rod 3 are not completely fixed, but play is provided in the uneven mounting portion such that the valve body 4 slightly moves with respect to the valve rod 3. Due to the mounting structure in the non-fixed state, the valve body 4 is movable in the sealing direction with respect to the valve rod 3.
- This valve body 4 is provided so that it can be moved up and down from the branch portion 12 via the valve rod 3 to open and close the valve seat surface 21 in the valve box 2.
- the annular valve seat portions 25 formed on both sides of the valve body 4 are pressed against the valve seat surface 21 by the fluid pressure, and the annular surface surfaces of the valve seat surface 21 and the valve seat portion 25 are pressed. The seal ensures that the fluid is sealed.
- the aforementioned flesh portion 20 of the valve box 2 is provided in a substantially conical shape in which the diameter gradually decreases from the vicinity of the boundary between the joint portion 11 and the branch portion 12 toward both sides of the joint portion 11 from the branch portion 12.
- the flesh portion 20 has a cone shape with the axis P2 as the rotation axis. Is formed as its outer shape.
- a substantially conical meat portion 20 whose bottom surface 26 side is eccentric upward with respect to the joint portion 11 is configured, and in FIG. 2 and FIG. 3, the upper side (branch portion 12 side) of the meat portion 20 is a lower portion. It is thicker than the side (the valve body storage portion 14 side).
- the intersection of the bottom surface 26 of the cone forming the thickened portion 20 and the center line P1 of the flow path is set as a base point S, and the rotation axis P2 is set so as to be eccentric from the base point S to the branching portion 12 side by a predetermined distance.
- FIG. 4 a schematic cross-sectional view of the bottom surface 26 side of the flesh portion 20 (cone) is shown.
- the joint portion 11 The thickness gradually increases in the circumferential direction, and the wall thickness becomes maximum at the intersection with the branch portion 12.
- the wall thickness portion 20 gradually becomes thinner as it approaches the valve body housing portion 14 side opposite to the branch portion 12, and the wall thickness becomes minimum at the intersection with the valve body housing portion 14.
- the flesh portion 20 On the upper surface 27 side of the flesh portion 20 (cone), the flesh portion 20 has the smallest wall thickness. Also in this portion, the upper side (branch portion 12 side) of the thickened portion 20 is thicker than the lower side (valve body storage portion 14 side).
- the flesh portion 20 on the branch portion 12 side has the maximum wall thickness in the cross-sectional direction of FIG.
- the wall thickness gradually decreases from the branch portion 12 side toward the valve body storage portion 14 side along the circumferential direction.
- the wall thickness portion 20 maintains a shape in which the wall thickness on the branch portion 12 side is larger in the cross-sectional direction, and the wall thickness is constant from the bottom surface 26 side to the top surface 27 side along the peripheral surface. It becomes thinner gradually.
- the rotation axis P2 is branched so that the contact point U between the rotation axis P2 and the valve seat surface 21 is located at a distance H of, for example, 5 to 10 mm from the center line P1 of the flow path. It is eccentric to the portion 12 side.
- the thickened portion 20 extends from the bottom surface 26 side to the upper surface 27 side. Secured all around.
- a long lid 23 is fixed to the upper portion of the valve box 2 by a bolt nut 30 in a sealed state, and a long operation portion 31 is connected to the upper portion of the lid 23.
- the operating portion 31 is provided with a rotary handle 32.
- the rotary handle 32 is rotated to rotate the valve rod 3, and the male rod 22 and the female screw 24 are screwed together to move the valve rod 3 to the valve box 2.
- the flow path 10 is opened and closed by the valve body 4 on the lower side of the valve rod 3.
- the valve body 1 has a metal touch seal structure and is provided as a valve suitable for ultra-low temperature fluid, but a separate seat member may be mounted in the valve box to have a soft seat structure ( (Not shown), it may be provided as a valve other than for the cryogenic fluid.
- valve box structure has the flange portion 13 provided on the end side of the joint portion 11, the end portion side of the joint portion 11 can be provided on any connection structure, and the conical thickening portion 20 is formed.
- the valve box has the joint portion 11 having a possible cross-sectional shape, the cross-sectional shape and the connection shape on the end side can be arbitrarily set.
- the thickened portion 20 having a substantially conical shape is taken as an example, but the shape of the thickened portion 20 is not limited to this, and may be, for example, a substantially cylindrical shape or a substantially frustoconical shape in which the diameter is gradually reduced from the branched portion. Alternatively, it may be a stepwise structure in which the bottom surface is cylindrical and has a conical shape from the middle. It has a cross-sectional structure consisting of a polygon that is line-symmetric with respect to a predetermined center line, and in the meat part with a shape rotated around the center line, this center line is from the center of the flow path to the branch part side. If it has an eccentric shape, it is possible to enhance the rigidity of the valve box that is preferable for the sluice valve. However, in consideration of castability and the like, a conical shape tends to be preferable.
- the flesh portion has an axis parallel to or intersecting with the center line P1 of the flow path in a state of being eccentric from the center line P1 of the flow path to the branch portion side. May be provided as.
- the outer periphery of the joint portion 11 is used as a reference position, and the flesh portion 20 is designed to have a predetermined size from this reference position.
- the cone has the same shape as the case where the intersection point between the bottom surface 26 and the center line P1 of the flow path is the base point S.
- the shape of the valve box 2 when setting the shape of the valve box 2, it is performed by the following first to sixth procedures.
- the cross-sectional shape of the thickened portion 20 at the bottom of the valve box 2 is specified as the first procedure.
- a line segment larger than the wall thickness of the bottom surface of the joint portion 11 and the wall thickness of the side surface of the valve body housing portion 14 in which the bottom side is housed is provided.
- the wall thickness of the outer peripheral bottom surface of the joint portion 11 is set to a thickness, for example, twice as large as the minimum wall thickness t required by the standard.
- An intersection point C2 is set as an intersection point of a line segment having twice the thickness t of the bottom surface of the part and a line segment having twice the thickness of the side surface of the valve body housing portion 14 in which the bottom side of the valve body 4 is housed.
- a suitable value as the assumed wall thickness of the outer peripheral bottom surface of the joint portion 11 changes depending on the size of the valve.
- the thickened portion 20 is thin because the valve box is thin. Also, it is preferable to make it correspondingly thick.
- a rib surface R0 having a predetermined angle is set, which passes through the intersection C0 and connects the valve body housing portion 14 side and the joint portion 11 side at a gentle angle.
- the rib surface R0 is an inclined surface having an intersection angle ⁇ of about 15 to 40°, for example, about 30° with the center line P1 of the flow path.
- the crossing angle ⁇ is shown using the outer circumference of the joint portion 11 parallel to the center line P1 of the flow path.
- a line parallel to the valve seat surface 21 is drawn upward from the intersection r0 between the rib surface R0 and the outer periphery of the joint portion 11 to the intersection C1 with the center line P1 of the flow path. Set the minute L1.
- a line perpendicular to the valve seat surface 21 is drawn from the intersection C1, and an intersection C2 between this line and a line drawn through the upper side of the valve body accommodating portion 14 and parallel to the valve seat surface 21 is obtained.
- a line segment L3 from the intersection point C2 to the intersection point C2 is set.
- a line parallel to the valve seat surface 21 is drawn from the intersection C2 toward the rib surface R0 to obtain the intersection C3, and a line segment L2 parallel to the valve seat surface 21 from the intersection C2 to the intersection C3 is set. ..
- the rib surface R0 and the line segments L1, L3, and L2 are set through the above first to fifth procedures, respectively. Further, in the sixth procedure, a half trapezoid surrounded by the rib surface R0 and the line segments L1, L3, and L2 is set, and the half trapezoid is rotated about the line segment L3 as an axis by 360°, and the outer circumference of the joint portion 11 is rotated.
- the protruding portion is set as the outer shape of the thickened portion 20 that reinforces the valve box 2.
- a trapezoid that is line-symmetric with respect to the line segment L3 is set, and a cone obtained by rotating this trapezoid about the rotation axis P2 that includes the line segment L3 is the thickened portion 20.
- the intersection point C2 which is the center of the lower base of the trapezoid, becomes the center of the bottom surface 26 of the flesh portion 20 (cone), and this center is the base point S (bottom surface of the cone.
- the eccentricity (offset) is made upward (to the side of the branching portion 12) from the intersection of 26 and the center line P1 of the flow path.
- This eccentricity is set such that the distance between the contact point U between the rotary shaft P2 and the valve seat surface 21, the contact point between the center line P1 of the flow path and the valve seat surface 21 is in the range of 1 to 10% with respect to the flow path diameter.
- the thickness of the fillet portion 20 can be made smaller as the valve becomes larger. Therefore, the eccentricity amount is generally preferably in the range of 1 to 10 mm, more preferably about 5 mm.
- the method for designing the fillet portion 20 is not limited to this example, and is not particularly limited as long as it is a method capable of forming a similar eccentric shape.
- the center line P1 that is eccentric from the base point S may be defined from the beginning, and the flesh portion 20 may be designed based on the center line P1.
- the method of this example in which the necessary wall thickness t of the bottom surface of the joint portion is first set may be preferable.
- Reinforcement by the flesh portion 20 is effective for valves of any size, but especially for valves of medium and large diameter (for example, about 4 to 24 inches), the reinforcement effect and the attachment of the valve box 2 itself.
- the eccentricity of the flesh portion 20 tends to easily provide a reinforcing effect particularly on the upper portion of the valve box.
- an axis eccentric to the branch portion 12 side from the center line P1 of the flow path at the base point S at a predetermined distance and orthogonal to the valve seat surface 21 is a rotation axis P2, and this rotation is performed. Since the outer shape is a cone obtained by the axis P2, the substantially conical reinforcing wall portion 20 that is gradually reduced in diameter from the vicinity of the boundary between the joint portion 11 and the branch portion 12 is formed integrally with the valve box 2, so that the joint is formed.
- the valve seat surface 21 is reinforced by the walled portion 20 without forming a rib-shaped reinforcing portion between the portion 11 and the branch portion 12.
- the substantially conical wall portion 20 suppresses an increase in wall thickness due to the wall thickness to a necessary minimum and also suppresses an increase in weight.
- the rib surface R0 passing through the intersection point C0 smoothly connects the valve body accommodating portion 14 side and the joint portion 11 side, and the rib surface R0 is used as the outer peripheral surface of the thickened portion 20, so that the castability is improved.
- the thickened portion 20 is thicker on the upper side (branch portion 12 side) in the valve box cross-sectional direction than on the lower side (valve body storage portion 14 side).
- the thickness of the branch portion 12 side is maximum in the range from the bottom surface 26 side of the cone) to the top surface 27 side, and along the circumference of the branch portion 12 from the branch portion 12 side to the valve body storage portion 14 side. And the thickness gradually decreases. In this way, by setting the flesh portion 20 so that the strength on the side of the branch portion 12 becomes larger, it is inversely proportional to the shape of the valve box 2 in which the strength decreases in the wedge shape toward the upper side. Increasingly thickened portions 20 can be provided, and the thickened portions 20 reinforce the valve box 2.
- the upper part of the valve box is to be reinforced, it is possible to provide a fleshed part only on the upper side of the valve box, but in that case, the difference in strength may increase at the boundary where the fleshed part is provided. is there. Particularly in the case of ultra-low temperature application, material shrinkage of the valve box is likely to occur, and such a difference in strength may cause uneven deformation.
- the flesh portions are provided not only on the upper side but also on the lower side and are eccentric to the upper side as a whole, there is no portion that causes a large difference in strength, As a result, it becomes possible to reinforce necessary parts as necessary.
- the outer peripheral bottom surface portion of the joint portion 11 is set as a reference position as described above, and the intersection points C0, r0, C1, C2, C3, line segments L1, L2, L3, rib surface from this reference position.
- a semi-trapezoid is set through R0 and the center line P1 of the flow path, and the semi-trapezoid is rotated by 360° about the line segment L3 to form the outer shape of the meat part 20. Therefore, it is possible to configure the thickened portion 20 having the same shape as the case where the thickened portion 20 is provided around the rotation axis P2.
- the sluice valve of the present invention configured as described above, but the sluice valve of the present invention is not limited to this specific example.
- the assumed wall thickness of the outer peripheral bottom surface of the joint portion 11 in the first procedure is set to twice the minimum wall thickness of the valve box, and the flow path of the rib surface R0 is set.
- the fillet portion 20 was designed by the first to sixth procedures with the intersection angle ⁇ with the center line P1 set to 30°.
- the thickness of the flesh portion 20 is The result is that the upper side is 23% thicker than the lower side.
- the contact pressure on the secondary side seat surface has a variation, leakage easily occurs from a place where the contact pressure is low. Therefore, it is preferable that the variation value is small. Then, the result of this specific example is a significantly improved result as compared with the simulation result when the flesh portion is provided without eccentricity.
- Valve Body 1 Valve Main Body 2 Valve Box 3 Valve Rod 4 Valve Body 10 Flow Path 11 Joint Section 12 Branch Section 14 Valve Body Storage Section 20 Meat Section (Cone) 21 valve seat surface 26 bottom surface of cone C0, C1, C2, C3, r0 intersection point H distance L1, L2, L3 line segment P1 flow path center line P2 axis (rotation axis) R0 rib surface S base point U contact t wall thickness
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- Mechanical Engineering (AREA)
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- Valve Housings (AREA)
Abstract
Description
さらに、超低温流体が流れる場合にも、この超低温流体により弁箱が伸縮して金属製弁座面が変形することを防ぎ、この弁座面と弁体の弁座シール面とのメタルタッチのシール性を確保し、常温流体と同様にシール性を確保する。
そして、上述のように、フレキシブルタイプの弁体を適用して弁箱側弁座の変形に対応しやすくする場合であっても、本発明のような偏心させた補強用付肉部を設けることで、弁箱側の変形をなるべく抑えることができるので、弁座の変形をそれほど考慮する必要がなく、フレキシブルタイプの弁体を用いる場合にも、均一な面圧シールを得ることが容易となる。
図4においては、付肉部20(円錐)の底面26側の模式断面図を示しており、このように、底面26側では、付肉部20が分岐部12方向に近づくにつれて継手部11の円周方向に徐々に厚くなり、分岐部12との交差位置でその肉厚が最大となる。一方、分岐部12と反対側の弁体収納部14側に近づくにつれて付肉部20は徐々に薄くなり、弁体収納部14との交差位置でその肉厚が最小となる。
このようにして、付肉部20は、断面方向において分岐部12側の肉厚がより大きい形状を維持しつつ、底面26側から上面27側に周面に沿って向かうに従って肉厚が一定の割合で徐々に薄くなる。
本例の仕切弁の製造方法においては、継手部11の外周を基準位置とし、この基準位置から付肉部20を所定の大きさに設定する手法により設計を行うことで、付肉部20(円錐)を、底面26と流路の中心線P1の交差位置を基点Sとした場合と同じ形状となるようにした。
付肉部20を設ける際には、十分な強度が得られる厚さの付肉を設けるために、第1の手順として、弁箱2最下部の付肉部20の断面形状を特定する。この場合、継手部11の外周底面部14を基準位置とし、継手部11の底面の肉厚よりも大きい線分と弁体4の底部側が収容される弁体収容部14の側面の肉厚よりも大きい線分との交点C0を設ける。
付肉部20による補強は、どのようなサイズのバルブに対しても有効であるが、特に、中及び大口径(例えば4~24インチ程度)のバルブにおいて、弁箱2自体の補強効果及び付肉部20の偏心による特に弁箱上部の補強効果が得られやすい傾向にある。
図1~図3に示すように、基点Sにおいて流路の中心線P1から分岐部12側に所定距離で偏心し、かつ弁座面21と直交する方向の軸を回転軸P2とし、この回転軸P2により得られる円錐を外形として、継手部11と分岐部12との境界近傍から漸次縮径する略円錐状の補強用付肉部20を弁箱2と一体に形成しているので、継手部11と分岐部12との間にリブ状の補強部を形成することなく付肉部20により弁座面21を補強している。この略円錐状付肉部20により、付肉による肉厚の増加を必要最小限に抑えて重量の増加も抑えている。交点C0を通るリブ面R0により弁体収容部14側と継手部11側とをなだらかにつなげ、このリブ面R0を付肉部20の外周面としているので鋳造性が向上する。
本具体例では、サイズ18Bの仕切弁において、第1の手順における継手部11の外周底面の仮定の肉厚を、弁箱の最小肉厚の2倍に設定し、リブ面R0の流路の中心線P1との交差角θを30°にして、第1~第6の手順により付肉部20の設計を行った。その結果、継手部11と分岐部12との境界部分において、付肉部20の厚み(継手部11の外周面に対して付肉部20を設けることで増した厚み)は、付肉部20の下部側に対して上部側が23%厚くなる結果となった。
2 弁箱
3 弁棒
4 弁体
10 流路
11 継手部
12 分岐部
14 弁体収容部
20 付肉部(円錐)
21 弁座面
26 円錐の底面
C0、C1、C2、C3、r0 交点
H 距離
L1、L2、L3 線分
P1 流路の中心線
P2 軸(回転軸)
R0 リブ面
S 基点
U 接点
t 肉厚
Claims (4)
- 両側に継手部を有する弁箱の内部流路との直交方向に分岐部が開口形成され、この分岐部から弁棒を介して弁体が昇降動して弁箱内の環状弁座面を開閉する仕切弁であって、前記継手部と前記分岐部との境界に略円筒状或いはこの分岐部より前記継手部側に向けて漸次縮径する略円錐状又は略円錐台状の補強用付肉部が設けられ、この付肉部は、前記流路の中心線から前記分岐部側に偏心し、かつ、前記流路の中心線と平行の又は交差する軸を回転軸とする円筒、円錐又は円錐台を外形として形成されていることを特徴とする仕切弁。
- 前記回転軸は、前記円錐の底面と前記流路の中心線との交差位置を基点とし、この基点から前記分岐部側に所定距離で偏心されている請求項1に記載の仕切弁。
- 前記回転軸と前記弁座面との接点が、前記流路の中心線から5~10mmの距離になるように前記回転軸が前記分岐部側に偏心されている請求項2に記載の仕切弁。
- 両側に継手部を有する弁箱の内部流路との直交方向に分岐部が開口形成され、この分岐部から弁棒を介して弁体が昇降動して弁箱内の環状弁座面を開閉する仕切弁であって、前記継手部と前記分岐部との境界に略円筒状或いはこの分岐部より前記継手部側に向けて漸次縮径する略円錐状又は略円錐台状の補強用付肉部が設けられ、この付肉部は、断面方向において分岐部側がその反対側の弁体収容部よりも肉厚がより大きい形状を維持しつつ、円錐の底面側から上面側に周面に沿って向かうにしたがって肉厚が一定の割合で徐々に薄く形成されていることを特徴とする仕切弁。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19896412.4A EP3879153A4 (en) | 2018-12-14 | 2019-12-13 | GATE VALVE |
AU2019399160A AU2019399160A1 (en) | 2018-12-14 | 2019-12-13 | Gate valve |
JP2020559340A JP7361719B2 (ja) | 2018-12-14 | 2019-12-13 | 仕切弁 |
US17/312,118 US11486499B2 (en) | 2018-12-14 | 2019-12-13 | Gate valve |
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JP2018233949 | 2018-12-14 | ||
JP2018-233949 | 2018-12-14 |
Publications (1)
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WO2020122233A1 true WO2020122233A1 (ja) | 2020-06-18 |
Family
ID=71075668
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2019/048968 WO2020122233A1 (ja) | 2018-12-14 | 2019-12-13 | 仕切弁 |
Country Status (5)
Country | Link |
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US (1) | US11486499B2 (ja) |
EP (1) | EP3879153A4 (ja) |
JP (1) | JP7361719B2 (ja) |
AU (1) | AU2019399160A1 (ja) |
WO (1) | WO2020122233A1 (ja) |
Citations (4)
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US3871615A (en) * | 1974-02-19 | 1975-03-18 | Deltrol Corp | Solenoid operated wedge gate valve |
JPS5798381U (ja) | 1980-12-09 | 1982-06-17 | ||
JPS61182464U (ja) * | 1985-05-02 | 1986-11-14 | ||
JP5094753B2 (ja) | 2009-01-23 | 2012-12-12 | 株式会社クボタ | 弁 |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
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US880463A (en) * | 1898-05-19 | 1908-02-25 | Pakin Company | Gate-valve. |
US1882227A (en) * | 1930-12-05 | 1932-10-11 | Edward Valve And Mfg Company | Gate valve |
FR772599A (fr) * | 1933-05-29 | 1934-11-02 | Commanditaire Vennootschap J B | Vanne d'arrêt |
US2194261A (en) * | 1937-05-07 | 1940-03-19 | Cameron Iron Works Inc | Gate valve, seat, and packing |
US2626775A (en) * | 1948-08-21 | 1953-01-27 | Temple | Valve |
US3837617A (en) * | 1973-04-19 | 1974-09-24 | Westinghouse Electric Corp | Gate valve |
US4389037A (en) * | 1975-08-18 | 1983-06-21 | Rockwell International Corporation | Double disc gate vale with replaceable spacer ring |
US4044997A (en) * | 1976-09-10 | 1977-08-30 | Rockwell International Corporation | Seat ring notch for gate valve guide rail |
FR2484044B1 (fr) * | 1980-06-10 | 1985-06-21 | Pont A Mousson | Robinet-vanne a opercule |
JPS5798381A (en) | 1980-11-17 | 1982-06-18 | Fujitsu Ltd | Control system for printing position |
JPS61182464A (ja) | 1985-02-08 | 1986-08-15 | Mitsubishi Motors Corp | 火花点火機関の点火時期制御装置 |
US6068018A (en) * | 1998-03-02 | 2000-05-30 | T & R Solutions, Inc. | Valve stem and method of manufacture |
CN103775666B (zh) * | 2013-12-30 | 2016-03-16 | 宁波市天基隆智控技术有限公司 | 闸阀 |
US10794495B2 (en) * | 2015-05-23 | 2020-10-06 | Gabriel Telles Villanueva | Power-driven gate valve |
-
2019
- 2019-12-13 US US17/312,118 patent/US11486499B2/en active Active
- 2019-12-13 EP EP19896412.4A patent/EP3879153A4/en active Pending
- 2019-12-13 AU AU2019399160A patent/AU2019399160A1/en active Pending
- 2019-12-13 JP JP2020559340A patent/JP7361719B2/ja active Active
- 2019-12-13 WO PCT/JP2019/048968 patent/WO2020122233A1/ja unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3871615A (en) * | 1974-02-19 | 1975-03-18 | Deltrol Corp | Solenoid operated wedge gate valve |
JPS5798381U (ja) | 1980-12-09 | 1982-06-17 | ||
JPS61182464U (ja) * | 1985-05-02 | 1986-11-14 | ||
JP5094753B2 (ja) | 2009-01-23 | 2012-12-12 | 株式会社クボタ | 弁 |
Also Published As
Publication number | Publication date |
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JP7361719B2 (ja) | 2023-10-16 |
US20220034408A1 (en) | 2022-02-03 |
AU2019399160A1 (en) | 2021-06-17 |
EP3879153A1 (en) | 2021-09-15 |
US11486499B2 (en) | 2022-11-01 |
EP3879153A4 (en) | 2022-08-24 |
JPWO2020122233A1 (ja) | 2021-11-04 |
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