KR101001136B1 - High Performance Metal Seat Butterfly Valve - Google Patents

Abstract

The present invention relates to a butterfly valve, the disk seating and the body seating provides a structure that is installed to form a space that can move a certain distance during the back pressure action of the fluid, thereby applying even in cryogenic and extremely high temperature improved air tightness This relates to a possible high performance metal seat butterfly valve.

According to the present invention, a body sheet formed therein; In the butterfly valve consisting of a disk installed in the interior of the body to be rotated, the disc seat ring is provided around the end edge contacting the body seat, the disc seat ring is the same as the upper surface A sheet protrusion is formed to protrude to the side, and an installation groove in which an elastic ring is installed is formed on an upper surface thereof; A disc sheeting installation groove is formed around an end edge of the disc; The disc seating groove is installed in the disc seating groove, and is fixed by a fastening ring fastened to the disc by a fastener; A cryogenic and cryogenic metal seat butterfly valve is provided at the upper portion of the seat protrusion, a moving space having a predetermined space with a disk is formed, and a lower moving space having a predetermined space with a fastening ring is formed.

Metal Seat, Butterfly Valve, Disc, Disc Seat

Description

High Performance Metal Seat Butterfly Valve {High performance butterfly valve}

The present invention relates to a butterfly valve, by providing a structure in which the disk seating and the body seating to form a space that can move a certain distance during the back pressure action of the fluid, the airtightness is improved and is applied even in cryogenic or extremely high temperature This relates to a possible high performance metal seat butterfly valve.

Both seat rings used for the body and the disc can be welded and grown using hard metal rings on the seat surface, allowing the seat surface to be used semi-permanently and crushing or cutting foreign substances in the fluid passing through the valve. It relates to a metal sheet butterfly valve was developed so that no absorption occurs.

A butterfly valve is a device that intercepts a fluid by rotating the disk 90 degrees about its axis.

Such valves cause bending of the shaft and the disk due to the assembly tolerance inevitably generated during the manufacturing process and the fluid pressure generated in the valve during use. Therefore, when the valve is closed, a great friction occurs between the body seat surface and the seat surface of the disk takes a lot of force during the opening and closing operation of the valve, this phenomenon is a common problem of the rotary valve that the disk is rotated 90 degrees.

The butterfly valve must have sufficient elasticity for either seat of the body seat or the disc seat to operate the valve. Therefore, one of the sheets of the body or disk is used elastic materials such as rubber, urethane, silicone, nylon, Teflon. However, these elastic materials are easily worn or have a disadvantage of high temperature or cryogenic temperature, a chemical-containing fluid or foreign matter in the fluid.

Metal seating has been developed to compensate for the above disadvantages. Metal seating is also used to process a thin metal so that the elasticity is required because the elasticity of the seating prerequisites of the butterfly valve, which is a 90-degree rotary valve.

In order to process thick metal thinly, processing cost was high. And because the metal thickness of the seat ring is vulnerable to foreign matter in the fluid, even if you try to use to weld hard materials such as stellite or inconel that can withstand the foreign matter there was a problem that the thickness of the seat ring can not be welded.

In addition, when the metal seat butterfly valve reaches a certain number of times, it loses its elasticity due to the fatigue phenomenon of the metal seat ring and loses the role of the seat ring. If the clamping ring is operated after fixing the seat with the body or the seat of the disk, the friction between the body and the disk seat surface becomes impossible.

As described above, the butterfly valve is developed and used in various configurations such as an axial center type as the seat of the elastic material and an eccentric type, a double eccentric type, and a triple eccentric type as the seating of the elastic material. The metal seat butterfly valve is used as a thin ring shape, and the shaft center type is not used because it is difficult to completely block the fluid, and it is manufactured and used in an eccentric type, a double eccentric type, and a triple eccentric type.

The metal seat butterfly valve has a partial shape of a sphere centering the disk seat surface, the body seat surface is inclined, and a thin seat ring is fixed to the body or the disk.

In addition, the dual eccentric type rather than the axial center type and the eccentric type, and the triple eccentric type than the dual eccentric type, the angle of rotation and friction between the body seat surface and the disk seat surface is small, so the valve opening and closing operation is easy.

Looking at the more specific prior art, Korean Patent Registration No. 0770545 (2007.10.20) and 0749389 (2007.08.08), the elastic packing is installed on both the bottom and side of the seat ring for the elastic movement of the seat seat ring Structure. In the above case, when the disc sheet is subjected to the back pressure, there is a problem that the close contact is not maintained by the deformation of the disc or the shaft. That is, one side of the body seating and the disc seating is fixed, so that if one deformation occurs, the other must move along the deformation to maintain the airtight, there is a structural problem that can not maintain the airtight because it is a fixed structure .

SUMMARY OF THE INVENTION An object of the present invention is to provide a butterfly valve that can withstand the corrosiveness of a fluid containing cryogenic and cryogenic temperatures and chemicals, is not damaged by foreign substances contained in the fluid, and also resists back pressure. In other words, it is a metal seat butterfly valve, the metal seat ring must be elastic and elastic, both the body and the disk seat surface should be a hard metal such as stellite or inconel, the operation of the valve should be smooth and long life, The specific purpose is to lower the manufacturing cost of the valve to make it economical.

In order to achieve the above object, a clasped sheeting and body sheeting is installed in the disk or the seat of the body, the disk sheeting and the body sheeting is moved at regular intervals by the static pressure or the back pressure of the fluid It is installed with a space, and the contact portion between the disk sheeting and the body sheeting is provided with a structure in which hard metals such as stellite or inconel are welded.

As described above, the present invention increases the airtightness and durability by providing elastic force even when the body seating and the disc seating are made by using a tub, and hard metals such as stellite or inconel can be grown by welding by using the tub. As well as protecting the valve from the back, its operation is smooth.

The present invention is characterized in that the disk seat ring (1) or the body seat ring (2) can be moved at regular intervals during the positive or reverse pressure of the fluid, so that even if the disk (3) is deformed by the fluid pressure to maintain the airtight In particular, airtightness at the time of back pressure becomes the main purpose.

First, Figure 1 is a general structure of a butterfly valve, the characteristic structural part of the present invention being the "A" part shown by the dashed-dotted line, the details of which are shown in Figures 2 and 3. 2, 3, and 4 to 12, the portion “A” of FIG. 1 is the portion “A” of FIG. 1 according to each embodiment. Therefore, FIGS. 4-12 do not represent the "A" part of FIG. 1 correctly.

Such a structure may be various embodiments depending on whether the disk seating (1) is installed and whether the body seating (2) is installed. The present invention according to each embodiment is as follows.

First, an embodiment in which the disc seating 1 is provided on the disc 3 is provided. It includes a body 5 formed therein the body sheet 4; Of the butterfly valve consisting of a disk (3) rotatably installed inside the body (5), and a disk seat ring (1) provided around the end edge of the body (5) to be in contact with the body seat (4). In this case, the disk seat ring (1) is formed so that the seat protrusion 6 protrudes laterally the same as the upper surface, the installation groove 8 is provided with one or more elastic rings (7) is installed on the upper surface ; A disc seating groove 9 is formed around an end edge of the disc 3; The disc seating groove (9) is provided with the disc seat ring (1) is fixed to the fastening ring (11) fastened to the disk (3) by the fastener (10); A moving space 12a having a predetermined space with the disk 3 is formed at an upper portion of the seat protrusion 6, and a moving space 12b having a predetermined space with the fastening ring 11 is formed at a lower portion thereof; It is a constitution.

And, it is an embodiment when the body seat ring 2 is installed on the body (5). In this case, the body seating body 2 is installed to protrude therein; A butterfly valve, which is installed to be rotated inside the body 5 and whose end edge is in contact with the body seating ring 2, comprising: a butterfly valve comprising: a lower side body 5 of the body seating ring 2 An installation groove 8 in which one or more elastic rings 7 are installed is formed on the upper surface of the upper side body 5, and a snap ring 13 is installed on the upper body 5; A moving space 12a is formed between the upper surface of the body seat ring 2 and the lower surface of the snap ring 13, and the upper surface of the installation groove 8 and the lower surface of the body seat ring 2 are formed. The moving space 12b is formed between the configuration.

In this case, the body seat ring 2 and the disk seat ring 1 are installed together. In this case, the body seating body 2 is installed to protrude therein; As a butterfly valve consisting of a disk (3) rotatably installed inside the body (5), a disk seat ring (1) is installed around the end edge in contact with the body seat ring (2); The disc seat ring 1 is formed such that the seat protrusion 6 protrudes laterally in the same manner as the upper surface thereof, and an installation groove 8 in which one or more elastic rings 7 are installed on the upper surface thereof is formed; A disc seating groove 9 is formed around an end edge of the disc 3; The disc seating groove (9) is provided with the disc seat ring (1) is fixed to the fastening ring (11) fastened to the disk (3) by the fastener (10); A moving space 12a having a predetermined space with the disk 3 is formed at an upper portion of the seat protrusion 6, and a moving space 12b having a predetermined space with the fastening ring 11 is formed at a lower portion thereof; It is a structure.

In the present invention, a hard metal, such as stellite or inconel, is welded to the end portion of the disc seat ring 1 or the disc 3 or the contact portion of the body seat ring 2 or the body seat 4 by welding. It is also possible to increase the structure.

In addition, by forming any one of the body sheet (4), the disk seat portion, the body seat ring (2), the disk seat ring (1) to be pointed, so that the parts in contact with the line contact to remove foreign matters, etc. It can also be configured. That is, according to the present invention, the seat surface of the body seat 4 or the body seat ring 2 is welded and grown by a hard material such as stellite or inconel, and the seat surface is inclined or sharply processed to close the valve. It is a structure for pulverizing the fine powder layer or tar layer adhered to the foreign matter and the sheet surface.

As described above, the present invention has a structure different from that of the prior art. In the prior art, Korean Patent Registration No. 0770545 (2007.10.20) and 0749389 (2007.08.08) provide elastic motion of the clamp seating. For this purpose, elastic packing is installed on both the bottom and side of the seat ring. In contrast, the present invention removes the side packing and constitutes only one bottom surface, and after the assembly of the valve, the space is also formed in the upper surface of the body seat ring (2) or the disc seat ring (1), so that the disc (3) is used to prevent the back pressure of the fluid in the pipeline. When receiving, even if the position of the disk seat due to the deformation of the disk 3 or the deformation of the shaft occurs, the close contact between the disk seat ring 1 and the body seat ring 2 is maintained to prevent leakage due to back pressure. That is positive pressure metal seat butterfly valve.

The elastic ring 7 is a packing for the seat seating used in the butterfly valve for high temperature or low temperature, and chemical resistance, the material and shape, such as metal pipe ring, synthetic resin ring may vary. The pipe shape may be any shape such as a pentagon or a polygon, but may have a cross-sectional shape such as ⊂, c without one wall of the pipe, or a flange formed outside the shape. In addition, the coil spring 14 may be inserted into the elastic ring 7 to increase elasticity. Of course, in the case of a small or low pressure valve, the coil spring 14 can be omitted in view of economical efficiency. If the valve is not a high temperature, cryogenic or chemical resistant valve, the expensive elastic ring (7) is not rubber, nylon, silicone, or urethane. Alternatively, teflon packing may be used.

And the installation groove 8 in which the elastic ring 7 is installed will be described based on the one formed in the disc seat ring 1, the installation groove 8 is in contact with the disc seat ring (1), not the disc seat ring (1) It may be formed in the disk 3 to be. In addition, the installation groove 8 formed in the body 5 may also be formed in the body seat ring 2 in contact with the body 5 instead of the body 5, and the installation ring 16a installed in the body 5 ( It may be formed in 16b).

The structure in which the disc seat ring 1 is installed in the disc 3 shown in FIGS. 2 to 4 and 9 to 12 will be described in detail as follows.

At the end of the disc 3 is formed a disc seating groove 9, in which the disc seating 1 can be installed. First, the elastic ring 7 into which the coil spring 14 is inserted is inserted into the installation groove 8 of the disc seat ring 1. Then, after inserting the disk seat ring (1) into the disk seating installation groove (9), the fastening ring (11) is fixed to the disk (3), but the sheet protrusion (6) protruding to the side of the disk seat ring (1) Install in the form of fixing). Therefore, in the case of FIG. 3 in which the disk 3 is in contact with the body, moving spaces 12a and 12b are formed above and below the disk seating 1.

In addition, the moving spaces 12a and 12b may also be formed on the body 5 side, in this case as shown in FIGS. 5 to 12.

5, the installation groove 8 is formed in the body 5, and the elastic ring 7 is inserted into the installation groove 8. And the body seat ring (2) is installed on top of the elastic ring (7), and the snap ring 13 is installed on the upper side of the body seat ring (2), leaving a space in which the moving space (12a) is to be formed Install. Therefore, the moving spaces 12a and 12b are formed in the upper and lower portions of the body seating ring 2 while the disk 3 is in contact with the body seating ring 2.

In the case of FIG. 6, the body protrusion 15 is formed in place of the snap ring 13 of FIG. 5, and when the body seat ring 2 is damaged, a separate installation ring 16a is installed to facilitate replacement. Of course, the installation ring 16a is fixed by the fixing ring 17 in which the fastener 10 is installed, and the fixing ring 17 is fixed by the engaging piece 18 such as a snap ring.

7 is the same as FIG. 5, but the end of the body seat ring 2 is sharply formed, and FIG. 8 is the same as FIG. 6.

9 to 12 are embodiments in which moving spaces 12a and 12b are formed on both the disk 3 side and the body 5 side.

As described above, the present invention may have various embodiments, which will be described below with reference to FIG. 9.

First, in the present invention, the upper and lower parts are referred to based on the direction shown in the drawings. The direction of the fluid flow from the top to the bottom and the pressure direction of the fluid is defined as the forward direction, and the direction of the fluid pressure from the bottom to the top is defined as the reverse direction.

When the fluid flows in the forward direction, the disk 3 is pressurized, and the inclination of the end of the disk 3 or the disk seat ring 1 is upward as shown in FIG. 9. Accordingly, when the fluid pressure in the forward direction is applied, the disc 3 or the disc seat ring 1 is pushed, and the fluid pressure acts to maintain the airtightness by the inclined direction of the end.

However, when a back pressure of the fluid is applied, a force is applied from bottom to top, and this back pressure deforms the disk 3. In the conventional case, there is a problem that airtightness cannot be maintained in such a reverse pressure state, but the present invention maintains airtight even if there is a deformation of the disk 3 at the time of back pressure.

In other words, the disc 3 is pushed and deformed at the time of the back pressure. In this case, since there is a moving space 12b formed under the seat protrusion 6 of the disc seating 1, the disc seating 1 is in position. Only the disk 3 while being present can accommodate the displacement. Therefore, the end of the fastening ring 11 is moved to the moving space 12b while moving with the disk 3.

And even if the disk seating (1) is moved, the fluid is applied to the moving space (12b) formed on the body 5 side to push the body seating (2). Since the body seat ring 2 has a wide width at the lower side, the direction in which the body seat ring 2 is moved upward by the back pressure becomes a direction for enhancing airtightness. Of course, the moving space 12a is formed on the upper portion of the body seat ring 2 so that the body seat ring 2 can move.

In addition, as shown in FIGS. 3 and 4, hard metals such as stellite and inconel are grown on the sheet portion of the body 5 by welding, and as shown in FIGS. 5 to 8, the disk ( Hard metal is welded on the end sheet portion of 3), and hard metal is welded on the end of the disc seat ring 1 in FIGS. 2 to 4 and 9 to 12, and FIGS. Hard metal is welded on the contact portion of the body seat ring 2 at 12 to prevent wear due to frequent contact and damage by foreign matter.

6, 8, 10, 12, and 13, the packing 19 is inserted and installed in a space between the mounting ring 16a or the mounting ring 16b and the body 5 in contact with each other. The packing 19 is selected and used to match the characteristics of the fluid passing through the valve, such as graphite, hippa, rubber Teflon. The role of the packing 19 is to prevent the fluid from leaking into the space between the mounting ring 16a and the body 5 during the back pressure action.

Although the above description has been described based on the shape of the flange type butterfly valve, the following describes the structure of the present invention for a butterfly valve of a wafer type or a lug type having a short interplanar distance of the valve shown in FIG. As follows.

In this embodiment of the wafer type or lug type butterfly valve, the snap ring 13 shown in Figs. 5, 7, 9, and 11 is not required, and furthermore, in Figs. 6, 8, 10, 12, The illustrated retaining ring 17 is not necessary.

Accordingly, in the case of FIG. 13, the body protrusion 15 is formed in place of the snap ring 13, and the mounting ring 16b is installed in the body 5 to replace the body seat ring 2. The mounting ring 16b is fixed to the body 5 by the fastener 10. In addition, an installation ring 8 in which an elastic ring 7 or an elastic ring 7 into which the coil spring 14 is inserted is formed is formed at the bottom of the body seat ring 2, and the elastic ring 7 is installed in the installation ring 16b. ) Is in contact with the structure. Of course, the mounting groove 8 may be formed in the mounting ring 16b instead of the body seat ring 2, in which case the elastic ring 7 is in contact with the bottom surface of the body seat ring 2.

Since the operation of each component in the above embodiment is the same as in the case of a general butterfly valve, a detailed description thereof will be omitted.

1 is a cross-sectional view of a butterfly valve

2 to 12 are detailed views of the portion “A” of FIG. 1, according to various embodiments.

13 shows an embodiment in a wafer type or lug type butterfly valve.

[Description of Drawings]

1: Disc seating 2: Body seating

3: disk 4: body seat

5: body 6: sheet stone

7: elastic ring 8: mounting groove

9: disc seating groove 10: fastener

11: fastening ring 12a, 12b: moving space

13: snap ring 14: coil spring

15: body protrusion 16a, 16b: mounting ring

17: retaining ring 18: locking piece

19: Packing

Claims (8)

A body 5 having a body sheet 4 formed therein; In the butterfly valve consisting of a disk (3) rotatably installed inside the body (5), a disk seat ring (1) is installed around the edge of the end, contacting the body seat (4); In the disc seat ring (1) is formed so that the seat protrusion (6) protrudes laterally the same as the upper surface, the installation groove 8 is provided with one or more elastic ring (7) is installed on the upper surface; A disc seating groove 9 is formed around an end edge of the disc 3; The disc seating groove (9) is provided with the disc seat ring (1) is fixed to the fastening ring (11) fastened to the disk (3) by the fastener (10); A moving space 12a having a predetermined space with the disk 3 is formed at an upper portion of the seat protrusion 6, and a moving space 12b having a predetermined space with the fastening ring 11 is formed at a lower portion thereof; High performance metal seat butterfly valve. delete A body 5 installed to protrude the body sheeting 2 therein; In the butterfly valve consisting of; a disk (3) rotatably installed inside the body (5), a disk seat ring (1) is installed around the end edge and in contact with the body seat ring (2); In the disc seat ring (1) is formed so that the seat protrusion (6) protrudes laterally the same as the upper surface, the installation groove 8 is provided with one or more elastic ring (7) is installed on the upper surface; A disc seating groove 9 is formed around an end edge of the disc 3; The disc seating groove (9) is provided with the disc seat ring (1) is fixed to the fastening ring (11) fastened to the disk (3) by the fastener (10); A moving space 12a having a predetermined space with the disk 3 is formed at an upper portion of the seat protrusion 6, and a moving space 12b having a predetermined space with the fastening ring 11 is formed at a lower portion thereof; High performance metal seat butterfly valve. 2. The high performance metal seat butterfly valve according to claim 1, wherein hard metal is welded to the contact portions of the body seat (4) and the disc seat ring (1). delete 4. The high performance metal seat butterfly valve according to claim 3, wherein hard metal is welded to the contact portions of the body seat ring (2) and the disc seat ring (1). 2. The high performance metal seat butterfly valve according to claim 1, wherein the body seat (4) is sharply formed and in line contact with the disc seat ring (1). 4. The high performance metal seat butterfly valve according to claim 3, wherein the body seat ring (2) is sharply formed and is in line contact with the end of the disc (3) or the disc seat ring (1).

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