JP3003068B2 - Rotary shut-off valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary stop valve,
More specifically, the present invention relates to a rotary type shut-off valve mainly suitable for high-pressure and high-temperature fluids and having an excellent sealing function.

[0002]

2. Description of the Related Art Generally, a butterfly valve of a rotary type is more compact, lighter, operable than a gate valve.
It is widely used because of its excellent flow characteristics and controllability. Usually, this type of butterfly valve is of a type using a rubber sheet on either the valve box side or the disc side, or a metal sheet separately from the rubber sheet to cope with the environment. Products with a structure that is similar to those in the market. These sheets have a structure in which, when the disc is in the closed position, the disc and the sheet are pressed against each other and the sheet is compressed, so that the sheet is compressed by an elastic repulsive force. In addition, when the pressure and temperature are exceeded, a high performance butterfly valve is used. This valve is a so-called soft
A valve with a sheet structure made of metal or metal, and by setting the axial center position of the disc to the double eccentric position, a higher contact surface pressure is generated to ensure reliable sealing performance. It is.

[0003] The various butterfly valves described above are:
In all cases, the fully closed position when the disc and the sheet surface are engaged with each other is set as the optimum interference. If the interference is further increased, the driving torque is increased and the sheet is destroyed. This results in a reduction in the sealing force on the contact surface. In particular, when the fluid is heated to a high temperature and a high pressure, the seal portion may be more deformed. Therefore, it is necessary to increase the drive torque applied to the disc to further increase the seal performance for the above-described reason. Is also impossible. Therefore, conventionally, the axial center position of the disc is provided at the double eccentric position, the seat surface in the valve box is formed as a conical surface, and the seat surface and the disc are separated according to the driving torque applied to the disc. A so-called torque sheet type shut-off valve for increasing the seal performance and a torque sheet type shut-off valve having a double eccentric structure in which a seal ring is mounted on the casing side have been proposed (for example, Japanese Patent Application Laid-Open No. H10-157572). JP-B-47-16895, JP-B1-47671, and JP-B3-110828). This type of shut-off valve has attracted attention as a valve having a structure that solves the drawbacks of a normal butterfly valve.

[0004]

However, this type of conventional shut-off valve also has various deficiencies. For example,
The butterfly valve described in Japanese Patent Publication No. 47-16895 is
The seat surface comprises a conical surface including a surface extending parallel to the casing wall surface and a surface having a wedge-shaped angle with respect to the casing wall surface, and further, the conical surface axis relative to the casing axis. Is inclined, so that the machining axis of the sheet surface must be complicatedly inclined with respect to the casing axis.
Workability is extremely poor, leading to increased costs. Also,
In the disk valve described in Japanese Patent Publication No. 1-47671, the seal ring is mounted on the frame (casing) side, so that the casing is increased and the disk is naturally increased. Not only does the entire system become large, making it difficult to replace sheets,
When the flange of the shing receives pipe stress, it has a problem that the sealing property is easily affected. Further, the butterfly type shut-off valve described in Japanese Patent Publication No. 3-10828 is
A sheet surface which is a part of a conical surface having an axis inclined with respect to the axis of the casing and which is perpendicular to the axis of the casing; Since it is made of a disc having a rotation axis perpendicular to the plane including the axis of the singing and the axis of the conical surface, the sealing performance is good, but in order to obtain the operation characteristics, the manufacturing process is necessarily complicated. In order to accurately process a conical sheet surface having an axis inclined with respect to the axis of the casing, for example, special jigs, tools, and machines are required. For a valve with a diameter, the cost of a jig or a tool occupies a large part of the entire manufacturing cost, which eventually leads to an increase in cost and a great problem in terms of economy. In addition, since the axis of the casing and the axis of the sheet surface are inclined, the size of the bore is limited in terms of processing.

The present invention has been developed as a result of intensive studies to solve the conventional problems. When the driving torque applied to the disc is increased, the seat surface and the seat ring mounted on the disc are reduced. It is possible to easily process by improving the sealing performance of the product and making the machining axis of the casing axis and the sheet surface the same. The purpose is to provide.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a ring formed in a cylindrical valve box having a long face to face.
Parallel or coaxial to the axis of the valve box.
This sheet surface is provided on a part of the conical surface having
Cut at two planes inclined with respect to the axis of the valve box flow direction
Disposed on the cone body of the truncated cone, while the rotation axis of the disc for closing the seat surface is eccentric from the central surface separating the seat surface to the opposite side of the apex of the conical surface by a certain distance,
And disposed at a position by a predetermined distance eccentric to the center line orthogonal to the center position of the center plane of the seat surface, further, on the outer peripheral portion of the disuccinimidyl, mounting the seat ring in pressure contact with the seat surface to elastically deform The configuration was adopted.

The incident angle of the sheet ring which comes into contact with the sheet surface is substantially constant around the outer periphery of the sheet ring, and the cone angle of the conical surface is in the range of 30 to 40 degrees. -The tring preferably has a structure in which a ring-shaped metal plate and a ring-shaped gasket are laminated in a laminating shape.

[0008]

According to the present invention, as described above, the sheet surface is disposed on a part of the conical surface and on the truncated conical body of the truncated cone cut along two planes inclined with respect to the axis in the flow direction of the valve box. Since the angle between the axis of the valve box and the axis of the conical surface is parallel or coaxial, it is easy to work on the sheet surface provided in the valve box and welding work such as ferrules, It can be designed and manufactured in a large size, and the seat ring can be easily replaced. Even if the flange of the valve box receives piping stress, the sealability is not affected.

Further, since the angle between the axis of the valve box and the axis of the conical surface is provided in parallel or coaxially, the processing axis of the processing machine or jig is made the same with the axis of the valve box, and the number of steps is reduced. The sheet surface of the valve box can be easily machined by minimizing it. The disk rotation axis for closing the sheet surface is
At a position eccentric to the opposite side of the apex of the conical surface from the center surface that separates the conical surface by a fixed distance, and at a fixed distance from a center line perpendicular to the center position of the center surface of the sheet surface, and at the outer periphery of the disc Since a seat ring that is elastically deformed by pressing against the sheet surface is attached to the part, it is possible to improve the sealing performance between the sheet surface and the sheet ring of the disk according to the driving torque applied to the disk. it can.

Furthermore, the angle of incidence of the seat ring in contact with the sheet surface is substantially constant around the outer periphery of the seat ring, and does not require a particularly large driving torque at any operation position. Due to the heavy eccentric structure, the sheet surface and the seat ring are immediately separated from each other, so that the operability is good and the sealing performance is extremely effectively exhibited.

Further, since the angle between the axis of the valve box and the axis of the conical surface is provided in parallel or coaxially, a large diameter can be obtained even if the distance between the surfaces is long, and the seat ring is made of a ring-shaped metal plate. And a ring-shaped gasket plate are laminated in a laminating shape, so that it has heat resistance, not only withstands high temperature and pressure, but also has an appropriate elastic effect, so the outer peripheral surface of the sheet ring is closed when the disc is closed. Since the sheet is uniformly pressed against the sheet surface and compressed in the centripetal direction in a uniform state, the sealability is significantly improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the rotary closing valve according to the present invention will be described below in detail. FIG. 1 is a cross-sectional view showing a fully closed state of the rotary closing valve, and FIG. 2 is a cross-sectional view showing a fully opened state of the rotary close valve. Reference numeral 1 denotes a cylindrical valve box. At both ends of the valve box 1, an inlet (or outlet) 2 and an outlet (or inlet) are provided.
3 and a bolt hole 5 is provided in the mounting flange 4. 6
Is a sheet surface formed inside the valve box 1. The sheet surface 6 is usually provided with a ferrule 7 to maintain the sealing performance. When stainless steel is used, it is not usually necessary to apply an embossing. The sheet surface 6 is a part of a conical surface 8 formed at an angle of the inclined surface of the sheet surface 6, and is approximately 15 degrees in the present embodiment in a direction perpendicular to the axis 9 of the valve box 1. Provided on the cone body at an inclined position. Also,
The angle between the axis 9 of the valve box 1 and the axis 10 of the conical surface 8 is provided in parallel or coaxially.

Reference numeral 11 denotes a disk-shaped disc. The disc 11 is formed by fitting a projecting portion 12 at the center and a groove 14 of the seat retainer 13 and fixing the bolt with a bolt 15 to form an outer peripheral portion of the seat retainer 13. A seat ring 17 is mounted on the stepped portion 16 and held by bolts 15. The seat ring 17 is provided with a gasket 18 for hermetically sealing. In this case, a positioning hole 19 is provided in a part of the disc 11, and this hole is aligned with a hole provided in the seat ring 17 to position the seat ring 17.

The seat ring 17 is made of a thin metal plate 20.
And a gasket plate 21 made of expanded graphite or the like. The outer peripheral edge of the seat ring 17 has the same shape as the inclined surface of the seat surface 6, is mounted so as to protrude slightly from the outer peripheral surface of the disc 11, and when the seat ring 17 comes into contact with the seat surface 6, the seat ring 17 moves in the centripetal direction. The inner peripheral surface of the seat ring 17 and the step 1 of the seat retainer 13 are pressed against each other.
6 and is compressed and sealed in a wedge shape. Further, the disc 11 is provided with a mounting hole 24 for mounting the rotating shaft 23, and when the rotating shaft 23 is inserted into the valve box 1, the disc 11 is stored in the valve box 1. The rotating shaft 23 inserted from the bottom of the valve box 1 is inserted into the mounting hole 24 of the disc 11 , fixed to the disc 11 via the key 25, and covered with the end plate 26.

The rotating shaft 23 is eccentric by a fixed distance Δx from a central surface 27 partitioning the sheet surface 6 in FIG. 4 to a side opposite to the vertex 28 of the conical surface 8.
7 is provided at a position eccentric by a fixed distance Δy from a center line orthogonal to the center position of the center 7. In addition, the incident angles θ1 and θ2 of the seat ring 17 that abuts on the seat surface 6 and compresses and seals
More, without requiring particularly large driving torque at any operating position, by a double eccentric structure of the above disuccinimidyl,
The seat ring 17 and the seat surface 6 can be immediately separated from each other, so that the abrasion is small and the sealing property is good. In this example, the incident angles θ1 and θ2 are provided in a substantially constant range, and the incident angles θ1 and θ2 include an arbitrary point at which the seat ring 17 contacts the seat surface 6 and a conical axis of the seat surface. An angle formed by a line perpendicular to a straight line connected to the axis of the rotation axis at that point on the plane and the sheet surface on the plane. Further, by setting the cone angle a of the conical surface 8 in the range of 30 degrees to 40 degrees, the machining axis is kept constant to enhance the workability. In the drawing, reference numeral 29 denotes a packing and 30 grounds.

Next, the operation of the above embodiment will be described. See
The gutter surface 6 is a part of the conical surface 8, and is provided in the valve box 1 because it is arranged on a truncated cone of a truncated cone cut in two planes inclined with respect to the axis in the flow direction of the valve box 1. It is possible to extremely easily perform processing of the sheet surface 6 and welding work such as embossing, replacement of the seat ring 17 is easy, and the valve box 1
Even if the flange 4 receives pipe stress, it does not affect the sealability and can withstand long-term use.

Since the angle between the axis 9 of the valve box 1 and the axis 10 of the conical surface 8 is provided coaxially, the processing axis of the processing machine or jig is made the same as the axis 9 of the valve box 1 and the process is performed. By reducing the number as much as possible, the sheet surface 6 of the valve box 1 can be easily processed, and even if the distance between the surfaces of the valve box 1 is long, a large diameter can be manufactured. Further, the rotating shaft 23 of the disk 11 for closing the sheet surface 6 is provided with a central surface 27 that separates the sheet surface 6.
At a position away from the vertex 28 of the conical surface 8 by a fixed distance Δx, and further by a fixed distance Δy from a center line orthogonal to the center position of the central surface 27 of the sheet surface 6,
In addition, since a sheet ring 17 that is elastically deformed by being pressed against the sheet surface 6 is attached to the outer peripheral portion of the disc 11,
When the driving torque is increased, that is, when the driving torque is increased, the seat ring 17 enters the sheet surface 6 to increase the interference, thereby exhibiting a closing function such as a gate valve.
When drive torque is applied to the opposite side, the interference is reduced and the seam is reduced.
The seat ring 17 is immediately detached from the contact surface 6, and there is no wear phenomenon or the like.

Further, due to the incident angles .theta.1 and .theta.2 of the seat ring 17 abutting on the seat surface 6, a particularly large driving torque is not required at any operation position, the operability is good, and the sealing performance is extremely effective. Be demonstrated. Further, since the angle between the axis of the valve box 1 and the axis of the conical surface 8 is provided in parallel or coaxially, a large diameter can be obtained even if the surface of the valve box 1 is long, and the seat ring 17 has a ring shape. Since the metal plate 20 and the ring-shaped gasket plate 21 are laminated in a laminated shape, they have heat resistance, not only withstand high temperature and high pressure, but also have an appropriate elastic effect. Since the outer peripheral surface is uniformly pressed against the sheet surface 6 and compressed in a uniform state in the centripetal direction, the sealing performance is significantly improved.

[0019]

As apparent from the above, the present invention has the following effects. That is, according to the increase of the driving torque applied to the disc, the sheet between the sheet surface and the disc is changed.
Because it is possible to increase the sealing performance, it is possible to maintain the same sealing performance as the gate valve, even though it is a rotary stop valve, and to minimize the separation angle between the sheet surface and the seat ring. Therefore, the operability and the durability are excellent, and it is possible to contribute to the improvement of the operation characteristics. Moreover,
Since the machining axis is the same as the valve box axis, the machining process can be minimized, and machining can be easily performed with a simple device. Therefore, the machining performance is extremely excellent, and the cost is reduced compared to conventional products. Thus, it is possible to provide a product which is extremely economical.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a fully closed state of a rotary stop valve according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the fully opened state of FIG.

FIG. 3 is a longitudinal sectional view of FIG.

FIG. 4 is an analysis diagram of a shutoff valve according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve case 6 Sheet surface 8 Conical surface 9 Axis 10 Axis 11 Disc 17 Sheet ring 23 Rotation axis 27 Center plane 28 Apex θ1 ・ θ2 Incident angle

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takeshi Ken Iino 2040 Nagasaka Kamijo, Nagasaka-cho, Kita-Koma-gun, Yamanashi Prefecture Inside the Kitz Nagasaka Plant (72) Inventor Chikoshi Gomi 2040 Nagasaka-Kamijo, Nagasaka-cho, Nagakaka-gun, Yamanashi Prefecture Co., Ltd. Kitz Nagasaka Plant (56) References Real Opening Sho-56-70254 (JP, U) JP-B Hei 1-47671 (JP, B2) JP-B Hei 3-10828 (JP, B2) (58) Fields surveyed (Int) .Cl. ⁷ , DB name) F16K 1/22

Claims (3)

(57) [Claims] 1. An annular shape formed in a cylindrical valve box having a long space between surfaces.
The seat surface has an axis parallel or coaxial with the axis of the valve box.
Is provided on a portion of the conical surface of this sheet surface is inclined relative to the axis of the flow direction of the valve box
It is disposed in the truncated cone of the conical body portion taken along two planes, while the axis of rotation of disuccinimidyl for closing the sheet surface is constant from the central plane dividing the sheet surface on the opposite side of the apex of the conical surface distance eccentrically and distribution at a position from the center line by a predetermined distance eccentricity perpendicular to the center position of the center plane of the seat surface
And setting, further, on the outer peripheral portion of the disuccinimidyl, rotary closure valve in pressure contact with the seat surface, characterized in that mounting the seat ring to be elastically deformed. 2. The conical angle of the above-mentioned conical surface from 30 degrees to 4 degrees
2. The rotary shutoff valve according to claim 1, wherein the range is 0 degrees. 3. The rotary shutoff valve according to claim 1, wherein the seat ring is formed by laminating a ring-shaped metal plate and a ring-shaped gasket plate in a laminating shape.