KR101857520B1 - butterfly valve and Valve shaft coupling methods to the disk of the butterfly valve - Google Patents

Abstract

The present invention improves the airtightness by improving the structure of the valve seat and improves the coupling structure between the disk and the valve shaft for controlling the flow rate to prevent damage or deformation of the disk or the valve shaft to improve durability and quality Butterfly valve and a method of coupling the disk and valve shaft of the butterfly valve.
The butterfly valve of the present invention comprises: a valve body (100) forming a fluid passage (101) through which fluid flows; A valve seat 200 installed inside the fluid passage of the valve body to maintain airtightness; A seat fixing ring 300 for fixing the valve seat; A valve shaft (400) rotatably mounted on the valve body by forming a flow preventing surface (401); A disk (500) having a fluidized-bed area (503) in close contact with the flow preventing surface and opening and closing the fluid passage by engaging with the valve shaft; And the disc sheet 600 installed on the rear surface of the disc and contacting the valve seat to maintain airtightness.
According to the present invention, it is possible to ensure smooth operation and excellent durability by preventing deformation or damage of the disk or the valve shaft, as well as improving the airtightness of the valve seat and the disk seat to prevent fluid leakage So that it is possible to improve the quality and operation reliability.

Description

[0001] The present invention relates to a butterfly valve and a method of coupling the same to a disk and a valve shaft of the butterfly valve.

The present invention relates to a butterfly valve and a method of coupling a disk and a valve shaft of the butterfly valve. More particularly, the present invention relates to a butterfly valve for improving airtightness by improving the structure of a valve seat, To improve the durability and quality of the disk or valve shaft by preventing damage or deformation of the disk or the valve shaft, and a method of coupling the disk and the valve shaft of the butterfly valve.

Generally, a valve is used to control the flow rate or pressure of a fluid by connecting to a pipe end or a pipe end, and has been used for controlling fluid flow for a long time.

Valves are the most common and important control element to control the flow of fluid in the final stages of each control step so that the flow of the pipe system is matched to the physical conditions and amount of fluid required in each process.

Conventional valves usually consist of valve bodies, lids, valve shafts, discs, valve seats and packing, and valve buttons. These valves are available in various forms depending on the structure, and are different in structure and material depending on the conditions of use .

These valves are widely used in all industrial fields using fluid flow. Especially, small valves used in thermal power plants, petrochemical product carriers and oil tankers are used various valves such as ball valves and gate valves .

However, because of the problem of the installation area and the weight of the large valve, the butterfly valve is widely used.

The butterfly valve is used for opening and closing the flow including the flow of the fluid by rotating the circular disk provided inside the valve body by the valve shaft, and the flow rate is adjusted according to the rotation angle of the disk by the valve shaft The structure is comparatively simple and can be made lighter than other valves, so that it is advantageous in that it is easy to downsize compared to the controllable flow rate because no additional support is required.

As a result, butterfly valves are widely used in apartment complexes, dams, drainage pumping stations, water pipelines, and other facilities related to water supply.

On the other hand, if the butterfly valve is used for a long period of time, various types of failures may occur due to the durability deterioration. The leakage of the water due to wear or damage between the disk and the valve seat rotating within the valve body, Failure due to joint damage is the most typical failure case.

Therefore, various techniques have been proposed to prevent the failure of the butterfly valve used for controlling the flow rate of the fluid to prolong the durability life of the butterfly valve. Exemplary prior arts are as follows.

Patent Document 10-1126412 discloses a valve body 10, a disk 20 for opening and closing the internal flow path 12 of the valve body 10, A triple side seat butterfly valve comprising a disc seat (30) to be fitted, a body sheet (40) fitted to an inner peripheral surface of the valve body (10) and contacting the disc seat (30) A first side sheet (50) is attached around the lower front end of the disk (20); The outer side surface 52 of the first side sheet 50 is exposed to the outside around the lower end of the disk 20 and the first side sheet 50 is formed around the outer surface 52 of the exposed first side sheet 50, And the first protruding frame 54 is configured to be inserted into the first insertion recess 42 formed in the circumference of the front surface of the body sheet 40; A second side sheet 60 is affixed to the rear upper periphery of the disc 20; The outer side surface 62 of the second side sheet 60 is exposed to the outside of the upper end of the disc 20 and the outer side surface 62 of the second side sheet 60 is exposed And the second protruded portion 64 is formed to be inserted into the second inserted groove 44 which is recessed around the rear surface of the body sheet 40. [ Side seat butterfly valves are available.

In addition, Japanese Patent Application Laid-Open No. 10-1167897 discloses a valve body 10, which is rotatably installed in the valve body 10, and which opens and closes the internal flow path of the valve body 10, A fixing shaft 14 protruding from the front surface of the disk 12, a main shaft 16 fitted to the fixing body 14 and rotating the disk 12, And a locker pin (18) fastened to the nut (20) while passing through the main shaft (16) and fixing the main shaft (16) to the fixing body (14) A locker pin leakage and escape prevention cover 22 having a shape corresponding to the fixing body 14 and having an accommodation space 26 capable of accommodating the fixing body 14 is covered on the outside of the body 14, ; A flange 24 is extended around the locker pin leakage and separation prevention cover 22 and the flange 24 is fastened to the disk 12 in a state of being tightly attached to the disk 12, And the release preventing lid 22 is fixedly attached to the disk 12. The butterfly valve is provided with a locker pin leakage prevention cover.

Published Patent Application No. 10-2011-0080507 (Jul. 13, 2011) Patent Registration No. 10-1126412 (Mar. 22, 2012) Patent Registration No. 10-1124165 (Mar. 27, 2012) Patent Registration No. 10-1167897 (2012. 07. 30.)

In the conventional art as described above, when the disk is coupled to the main shaft connected to the driving means, a fixing hole is formed in the main shaft and the disk, respectively, and then fixed by fixing means comprising a combination of a fixing pin or a bolt nut.

Therefore, when the disc is worn and damaged, it is possible to provide ease of maintenance through disassembly and assembly. However, it is difficult to provide a fixing hole formed at a middle position of the main shaft, There is a possibility that a phenomenon that the main shaft is deformed or broken is generated in the end.

Also, in the related art, when the main shaft and the disk are disassembled and assembled, the lock pin (the fastening bolt) which penetrates the main shaft and the disk at the same time maintains a firm coupling by using the fastening force of the nut. And the main shaft is often bent or damaged frequently.

Therefore, when the main shaft is deformed or damaged as described above, it is difficult for the retainer formed on the disk and the valve body to maintain a normal close contact state, so that the fluid leaks even in the closed state of the valve, It becomes difficult to control them appropriately.

In addition, due to the nature of the butterfly valve, the valve body is formed in an eccentric form in which the center of the disk and the valve body coincides with the eccentricity from one position to as many as three positions. Normally, a valve seat is integrally formed in the valve body, So that the airtightness is maintained by fixing the valve seat formed by laminating a plurality of sheets of sheets.

Therefore, when high strength and high precision are required, it is inconvenient to separately process the valve seat integrally formed in the valve body while exchanging the entire valve body, and there is a disadvantage that excessive replacement cost is required.

Further, even in the case of a valve seat laminated on a disk, since the valve seat is positioned in the same direction as the direction in which the fluid moves in the state where the valve is opened, the fluid seeps between the valve sheets stacked by the speed and pressure of the fluid Such a phenomenon accumulates, and as a result, it becomes difficult for the valve seat to perform its function, so that it is difficult to maintain the airtightness in the state where the valve is closed.

Therefore, it is inevitable to develop a butterfly valve capable of improving durability and quality by preventing damages or deformation of a disc or a valve shaft by improving a coupling structure between a disc and a valve shaft, which is a drawback of the prior art.

The butterfly valve of the present invention and the coupling method of the disk and the valve shaft of the butterfly valve have been developed in order to overcome the above-mentioned problems of the prior art, and the fluid passage (101) And an annular seat mounting portion 102 having an inner diameter smaller than the inner diameter of the fluid passage 101 is formed in the fluid passage 101. The fluid passage 101 is connected to both ends of the fluid passage 101, A valve body 100 having a flange portion 103 for making the valve body 100;

And has an outer diameter corresponding to the inner diameter of the fluid passage 101 and an inner diameter of which is reduced to be reduced from the front to the rear to closely contact the annular mounting surface 102a of the seat mounting portion 102 A valve seat 200 installed so as to maintain airtightness;

And is screwed to the seat mounting portion 102 by a fastening bolt passing through the valve seat 200 while being in an annular shape like the valve seat 200 and being in close contact with the rear surface of the valve seat 200, 200) for fixing the seat (200);

The upper surface of the upper surface of the valve body 100 and the upper surface of the upper surface of the valve body 100 are connected to each other by a coupling portion 505 provided on the front surface of the disk 500, A valve shaft 400 rotatably mounted to the boss 104 formed integrally with the boss 104;

And an engaging groove 501 corresponding to the outer surface shape of the valve shaft 400 is formed on one side surface in the longitudinal direction and an intestine 502 corresponding to the flow preventing surface 401 is formed inside the engaging groove 501 (503) having a fixed protruding portion (503a) which is formed in the elongated hole (502) and is in close contact with the flow preventing surface (401) to prevent the valve shaft (400) A disk (500) coupled to the other side and rotated by the valve shaft (400) to open and close the fluid passage (101);

The disc 500 is formed in a ring shape and is screwed to the rear surface of the disc 500 so as to fit into an annular coupling groove 504 formed at the rear edge of the disc 500. The outer diameter of the disc 500 is larger than the outer diameter of the disc 500, And a disk sheet 600 formed in an all-overhead shape in which the inner diameter is reduced from the front to the rear so as to be closely adhered to the inner diameter formed in an all-optical oblique shape of the disk 200.

The valve seat 200 is formed by a multilayer laminate structure in which the thin metal ring 201 and the graphite ring 202 are alternately stacked and integrated and the graphite ring 202 is positioned on the front and rear surfaces, respectively .

The valve shaft 400 is formed with a polygonal coupling surface 402 on the outer circumferential surface thereof and is coupled to the coupling surface 402 of the valve shaft 400, The valve shaft 400 and the disc 500 are coupled using a fixing bracket 506 having a fixing groove 506a corresponding to a sectional shape.

A valve body 100 forming a fluid passage 101 through which fluid flows; A valve seat (200) installed in the fluid passage (101) of the valve body (100) to maintain airtightness; A seat fixing ring 300 for fixing the valve seat 200; A valve shaft (400) rotatably mounted on the valve body (100); A disk 500 coupled to the valve shaft 400 to open and close the fluid passage 101; A disk sheet 600 installed on a rear surface of the disk 500 to maintain air-tightness in contact with the valve seat 200;

A valve stop shaft 401 having a predetermined length in the longitudinal direction is formed on one side surface of the valve shaft 400 so as to be engaged with the disk 500 by the engaging portion 505 provided on the front surface of the disk 500,

A coupling groove 501 corresponding to the outer surface shape of the valve shaft 400 is longitudinally formed on the front surface of the disk 500 and a corresponding one of the flow prevention surfaces 401 is formed inside the coupling groove 501 (502) is formed,

And a moving protruding portion 503 having a fixed protruding portion 503a which is in close contact with the flow preventive surface 401 and prevents the valve shaft 400 from flowing therethrough, And the valve shaft 400 is coupled with the rear surface of the valve shaft 400 so as to prevent the valve shaft 400 from flowing.

The butterfly valve of the present invention and the method of combining the disk and the valve shaft of the butterfly valve can improve the airtightness and prevent damage or deformation of the disk or the valve shaft and improve durability and quality It is possible to accomplish one purpose.

The butterfly valve of the present invention and the method of combining the disk and the valve shaft of the butterfly valve improve the coupling structure between the disk and the valve shaft to prevent deformation or damage of the disk or valve shaft by the fluid, And the airtightness is improved by improving the structure of the valve seat and the disc seat, thereby preventing leakage of the fluid and enabling precise control, thereby improving the quality and operation reliability.

It also minimizes the physical impact on the disc or valve shaft during disassembly and assembly, thereby providing ease of disassembly and assembly for maintenance without affecting durability, thereby reducing maintenance costs and time. have.

1 is an external perspective view of a butterfly valve according to an embodiment of the present invention;
2 is a cross-sectional perspective view of a butterfly valve in accordance with an embodiment of the present invention.
3 is a fragmentary exploded perspective view of a disk and valve shaft portion of a butterfly valve in accordance with an embodiment of the present invention.
4 is a perspective view of a valve seat of a butterfly valve according to an embodiment of the present invention.
5 is a plan sectional view of a butterfly valve in accordance with an embodiment of the present invention.
6 is an enlarged cross-sectional view of a valve seat and a disc close portion of a butterfly valve according to an embodiment of the present invention.
7 is an exploded perspective view of a disk and valve shaft coupling portion of a butterfly valve according to another embodiment of the present invention.
Figs. 8 and 9 are diagrams showing an example of a butterfly valve of the prior art; Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a butterfly valve according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The butterfly valve of the present invention comprises: a valve body (100) forming a fluid passage (101) through which fluid flows; A valve seat (200) installed in the fluid passage (101) of the valve body (100) to maintain airtightness; A seat fixing ring 300 for fixing the valve seat 200; A valve shaft (400) rotatably mounted on the valve body (100) by forming a flow preventive surface (401); A disk 500 having a fluidized-bed surface 503 which is in close contact with the flow prevention surface 401 and opens and closes the fluid passage 101 by being engaged with the valve shaft 400; And the disc sheet 600 installed on the rear surface of the disc 500 to maintain air-tightness in contact with the valve seat 200.

The valve body 100 has a fluid passage 101 through which a fluid flows so as to allow a fluid to flow therethrough in the center of the fluid passage 101. Inside the fluid passage 101, 101 formed at both ends of the fluid passage (101) and having an inner diameter smaller than the inner diameter of the fluid passage (101) Thereby forming a flange portion 103 for installation.

The valve seat 200 is provided inside the fluid passage 101 of the valve body 100 and has a multi-layer structure for maintaining airtightness. The outer diameter of the valve seat 200 corresponds to the inner diameter of the fluid passage 101, And is formed so as to be smaller than the inner diameter of the seat mounting portion 102 so as to be in close contact with the annular mounting surface 102a of the seat mounting portion 102. [

The valve seat 200 has a multilayer laminate structure in which the thin metal ring 201 and the graphite ring 202 are alternately stacked to improve the air-tightness and durability, so that the valve seat 200 has an elastic effect by the overlapping of different materials, To maintain a stable air-tightness in correspondence with the thermal expansion according to the fluid of the fluid, and at the same time to ensure excellent durability and abrasion resistance.

Particularly, in the process of forming the multilayer laminate structure by alternately stacking the thin metal ring 201 and the graphite ring 202, the graphite ring 202 is positioned on the front and rear surfaces of the valve seat 200, Thereby preventing the valve seat 200 from being fixed to the mounting surface 102a of the seat mounting portion 102 made of a metallic material in use.

In forming the metal ring 201 and the graphite ring 202 in a laminated structure, the metal ring 201 and the graphite ring 202 may be formed by a known laminating method such as a pressing method using a high- It is needless to say that a multilayer laminate structure can be formed by applying any one of them.

The seat fixing ring 300 is annular like the valve seat 200 to engage the valve seat 200 so that the valve seat 200 can be disassembled and assembled to the seat mounting portion 102 of the valve body 100, The fastening bolt that passes through the valve seat 200 and the seat fastening ring 300 at the same time is screwed to the female threaded portion formed radially in the seat fastening portion 102, The valve seat 200 in which the annular seat fixing ring 300 is formed in an annular shape while acting on the stationary ring 300 is tightly fixed to the mounting surface 102a formed on the seat mounting portion 102 of the valve body 100 Tightly.

Therefore, the valve seat 200 and the seat fixing ring 300 are formed in a radial shape so as to communicate with each other through the fastening bolt, and the number of the passages is larger than the number of the valve seat 200 and the seat fixing It is preferable to increase or decrease in proportion to the diameter of the ring 300.

The valve shaft 400 is formed in a longitudinal direction on one side of the disk 500 so as to be rotatable in the valve body 100 while preventing the valve shaft 400 from flowing after coupling with the disk 500, The upper and lower end portions of the valve body 100 are rotatably mounted on the boss portion 104 integrally formed on the upper and lower portions of the valve body 100.

The flow prevention surface 401 is formed by cutting one side of the valve shaft 400 having a circular cross section in the longitudinal direction by a flat cutting process and may be formed by the entire length of the valve shaft 400, Is formed in the center portion of the valve shaft 400 with a predetermined length.

The coupling part 505 is integrally formed with the disk 500 on the front and the bottom of the disk 500 at predetermined intervals so that the valve shaft 400 is inserted through the shaft holding part The valve shaft 400 is fixed by the use of the fluid chamber 503 coupled to the disk 500 so that the valve shaft 400 and the disk 500 are firmly coupled to each other. Will be described in more detail in the description of the structure and operation of the disk 500 below.

The valve shaft 400 is rotatably supported at one side of a boss 104 formed in the valve body 100 so as to be rotatable about the axis of the valve shaft 400 by a manual operation such as a handle capable of rotating the valve shaft 400 in the forward / , Or a motor. The driving means is well known in the technical field of the present invention, and a detailed illustration and a detailed illustration thereof will be omitted.

The disk 500 includes a fluidized-bed chamber 503 which is in close contact with the flow preventive surface 401 of the valve shaft 400 and is coupled with the valve shaft 400 to open and close the fluid passage 101 And an engaging groove 501 corresponding to the outer surface shape of the valve shaft 400 is formed on one side surface in the longitudinal direction and an intestine 502 corresponding to the flow preventing surface 401 is formed inside the engaging groove 501 (503) having a fixed protruding portion (503a) which is formed in the elongated hole (502) and is in close contact with the flow preventing surface (401) to prevent the valve shaft (400) It can be disassembled and assembled on the other side.

The coupling groove 501 is formed in the longitudinal direction on the front surface of the disk 500. The coupling groove 501 is formed on the flow prevention surface 401 of the valve shaft 400 when viewed from above in consideration of the thickness for durability of the disk 500. [ Of the outer surface of the valve shaft 400 including the outer circumferential surface of the valve shaft 400 and the outer circumferential surface of the outer circumferential surface of the valve shaft 400.

A slot 502 corresponding to the flow preventing surface 401 formed in the valve shaft 400 is formed in the coupling groove 501 so as to penetrate the disk 500 before and after the slot 500, And a fixed protrusion 503a closely contacting the entire flow preventing surface 401 in correspondence to the width and the height of the flow preventing surface 401 is provided on the front surface of the valve shaft 400, The fastening bolts are fastened to the female threaded portion formed on the disk 500 so as to be disassembled and assembled on the other side of the disk 500. [

The movable diaphragm 503 coupled to the rear surface of the disk 500 to be disassembled and assembled is formed in a disk shape having an outer diameter larger than the entire length of the elongated body 502 and the fixed protrusion 503a, It is preferable that the outer diameter of the disk-shaped diaphragm 503 is formed so as not to interfere with the disk sheet 600 installed on the rear surface of the disk 500.

The disc sheet 600 is installed on the rear surface of the disc 500 and is annularly formed in contact with the valve seat 200 so as to maintain airtightness. The disc sheet 600 has an annular coupling groove 504 formed at the rear edge of the disc 500 And the outer diameter of the disc 500 is larger than the outer diameter of the disc 500. The outer diameter of the inner diameter of the disc 500 is increased from the front side to the rear side so as to closely adhere to the inner diameter of the valve seat 200, So that the airtightness of the valve seat 200 can be maintained.

The disc seat 600 is preferably made of metal but is not limited thereto and a sealing member 601 may be further provided between the coupling recess 504 and the disc seat 600 to increase airtightness. Of course.

7 shows another example of coupling between the valve shaft 400 and the disk 500. As shown in the figure, the valve shaft 400 has a polygonal coupling surface 402 formed on its outer circumferential surface A coupling groove 501 corresponding to a coupling surface 402 of a polygonal shape of the valve shaft 400 is longitudinally formed on a front surface of the disk 500, The valve shaft 400 and the disk 500 are fixed by using a fixing bracket 506 having a fixing groove 506a corresponding to a cross sectional shape of the coupling surface 402 of the valve shaft 400, Lt; / RTI >

It is preferable that the polygonal coupling surface 402 is formed in a square shape in a plan view, but the present invention is not limited thereto. The coupling bracket 506 may be formed by combining the valve shaft 400 and the disk 500 It is preferable that at least two or more of the fixing brackets 506 are installed at a predetermined interval in the vertical direction.

Hereinafter, the use of the butterfly valve according to the present invention will be described.

The butterfly valve of the present invention is provided by installing the valve body 100 in the middle of the fluid conveyance pipe

The rotation angle of the valve shaft 400 is controlled by using the driving means for rotating the valve shaft 400 combined with the disk 500 for opening and closing the fluid passage 101 to control the rotation angle of the disk 500 installed in the fluid passage 101, The flow rate of the fluid passing through the fluid passage 101 of the valve body 100 is regulated.

That is, when the disk 500 is completely closed by the driving means, the inner diameter portion of the valve seat 200 fixed to the seat mounting portion 102 of the valve body 100, The outer diameter portion of the disc sheet 600 installed in the outer casing 500 is connected and kept air-tight so that the flow of the fluid is completely cut off.

When the disk 500 opens the fluid passage 101 of the valve body 100 slightly, the valve seat 200 installed on the seat mounting portion 102 of the valve body 100, The flow rate of the fluid is determined by the interval (opening amount)

On the other hand, the valve seat 200 of the present invention has elasticity effect by overlapping different kinds of materials by forming the metal ring 201 having a small thickness and the graphite ring 202 alternately so as to have a multilayer laminate structure, It is possible to maintain stable airtightness in correspondence with the thermal expansion according to the present invention, and at the same time to ensure excellent durability and abrasion resistance.

The valve seat 200, which is a main component for maintaining the airtightness in the course of controlling the flow rate of the fluid, is installed to disassemble and mount the valve seat 200 on the seat mounting portion 102 of the valve body 100, The disc sheet 600 which is held in close contact with the disc 500 is disassembled and assembled in the coupling groove 504 of the disc 500 so that when the airtightness is deteriorated in the process of controlling the flow rate of the fluid due to long- Since the valve seat 200 and the disc seat 600 can be replaced only by replacing the entire fly valve, the durability can be restored. Therefore, the durability life is greatly extended as compared with the conventional method of replacing the entire valve, The maintenance cost and the time for maintenance can be greatly reduced.

A flow preventing surface 401 is formed on one side of the valve shaft 400 when the disk 500 is coupled to the valve shaft 400 that opens and closes the disk 500 installed in the valve body 100 for controlling the flow rate. The valve shaft 400 and the disk 500 can be tightly coupled to each other by using the fluid chamber 503 coupled to the disk 500 with the fixing protrusion 503a that is in close contact with the flow prevention surface 401, It is possible to prevent the valve shaft 400 or the disk 500 from rotating independently after the valve shaft 400 and the disk 500 are coupled to each other to ensure stable valve opening and closing performance.

In addition, since the coupling between the valve shaft 400 and the disk 500 is made without forming a hole penetrating the valve shaft 400, the strength due to the reduction in the cross-sectional area of the valve shaft 400, It is possible to prevent the deformation or breakage of the valve shaft 400 due to the pressure of the fluid. Thus, the durability of the butterfly valve can be improved while ensuring smooth operation.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the invention as defined by the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

100: valve body 101: fluid passage
102: sheet mounting portion 103: flange portion
104: boss portion 200: valve seat
201: metal ring 202: graphite ring
300: seat fixing ring 400: valve shaft
401: flow prevention surface 402: coupling surface
500: Disk 501: Coupling groove
502: Chapter 503: Yu Dongbang District
503a: Fixed protrusion 504: Coupling groove
505: engaging portion 506: fixed bracket
506a: Fixing groove 600: Disk sheet
601: Sealing member

Claims (4)

An annular sheet installation part (102) having an inner diameter smaller than the inner diameter of the fluid passage (101) is formed in the fluid passage (101) in a transverse direction at the center in the fluid passage , A valve body (100) having flanges (103) at both side ends of the fluid passage (101) for connection to pipes;
And has an outer diameter corresponding to the inner diameter of the fluid passage 101 and an inner diameter of which is reduced to be reduced from the front to the rear to closely contact the annular mounting surface 102a of the seat mounting portion 102 A valve seat 200 installed so as to maintain airtightness;
And is screwed to the seat mounting portion 102 by a fastening bolt passing through the valve seat 200 while being in an annular shape like the valve seat 200 and being in close contact with the rear surface of the valve seat 200, 200) for fixing the seat (200);
The upper and lower end portions of the valve body 100 are connected to the upper and lower ends of the valve body 100 by a coupling portion 505 provided on the front surface of the disk 500, A valve shaft (400) rotatably installed on the integrally formed boss portion (104) in the longitudinal direction;
A disk 500 coupled to the valve shaft 400 and rotated by the valve shaft 400 to open and close the fluid passage 101;
The disc 500 is formed in a ring shape and is screwed to the rear surface of the disc 500 so as to fit into an annular coupling groove 504 formed at the rear edge of the disc 500. The outer diameter of the disc 500 is larger than the outer diameter of the disc 500, And a disk sheet (600) which is formed in an all-optical oblique shape in which an inner diameter is reduced from the front surface to the rear surface so as to closely adhere to an inner diameter formed in an all-optical oblique shape of the butterfly valve (200). The method of claim 1, further comprising:
The valve seat 200 is formed by a multilayer laminate structure in which the thin metal ring 201 and the graphite ring 202 are alternately stacked and integrated and the graphite ring 202 is positioned on the front surface and the rear surface, respectively Butterfly valve. The method of claim 1, further comprising:
The coupling between the valve shaft 400 and the disk 500 includes an engagement groove 501 formed in the longitudinal direction of the disk 500 corresponding to the outer surface shape of the valve shaft 400; A slot 502 formed in the coupling groove 501 in correspondence with the flow preventing surface 401 of the valve shaft 400; A movable diaphragm 503 having a fixed protruding portion 503a which is in close contact with the flow preventing surface 401 to prevent the valve shaft 400 from flowing through the elongated hole 502;
The valve shaft (400) has a coupling surface (402) formed in a polygonal shape on an outer peripheral surface; A coupling groove 501 formed on the front surface of the disk 500 in a longitudinal direction of the disk 500 corresponding to the coupling surface 402; And a fixing bracket 506 having a fixing groove 506a corresponding to a cross sectional shape of the coupling surface 402 of the valve shaft 400. The valve shaft 400 and the disk 500 are coupled to each other Butterfly valve. A valve body (100) forming a fluid passage (101) through which fluid flows; A valve seat (200) installed in the fluid passage (101) of the valve body (100) to maintain airtightness; A seat fixing ring 300 for fixing the valve seat 200; A valve shaft (400) rotatably mounted on the valve body (100); A disk 500 coupled to the valve shaft 400 to open and close the fluid passage 101; And a disc sheet 600 installed on the rear surface of the disc 500 to maintain air-tightness in contact with the valve seat 200,
A valve stop shaft 401 having a predetermined length in the longitudinal direction is formed on one side surface of the valve shaft 400 so as to be engaged with the disk 500 by the engaging portion 505 provided on the front surface of the disk 500,
A coupling groove 501 corresponding to the outer surface shape of the valve shaft 400 is longitudinally formed on the front surface of the disk 500 and a corresponding one of the flow prevention surfaces 401 is formed inside the coupling groove 501 (502) is formed,
And a moving protruding portion 503 having a fixed protruding portion 503a which is in close contact with the flow preventive surface 401 and prevents the valve shaft 400 from flowing therethrough, And the valve shaft (400) can be prevented from flowing due to the disassembly and assembly of the valve shaft (400).

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