KR20020008354A - Butterfly valve - Google Patents

Abstract

PURPOSE: A butterfly valve is provided to prevent the friction of a metal seat ring when opening or closing a valve disc for extending the lifespan of the metal seat ring and achieve the close compression between the metal seat ring and a retainer ring by allowing the metal seat ring to move to contact the retainer ring when opening or closing the valve disc. CONSTITUTION: A butterfly valve includes a valve body having a flow channel, valve shafts sealingly and rotatably mounted to the valve body, and a valve disc mounted to the valve body via the valve shafts for opening and closing the flow channel, wherein the valve disc includes polygonal shaft parts(16a) formed at facing ends of the valve shafts, upper and lower connection blocks(20) integrally formed at a surface of the valve disc for connecting the valve shafts and formed with polygonal grooves(20a) having a fine space for minute movement of the valve disc with respect to the polygonal shaft parts, elastic elements(22) via which the polygonal shaft parts are mounted perpendicularly to the polygonal grooves with repulsive force for blocking the vibrations and noise of the valve disc due to a fluid pressure, a metal seat ring(26) movable mounted to an inclination sealing surface of the valve disc with a clearance via a first stepped portion of the flow channel, and a retainer ring(28) fixed by a coupling element to a second stepped portion of the flow channel for retaining the metal seat ring sealingly.

Description

Butterfly Valve {BUTTERFLY VALVE}

TECHNICAL FIELD The present invention relates to a butterfly valve, and more particularly to a butterfly valve used for high temperature and high pressure, which enables the valve disk to be finely moved, thereby preventing a complete sealing and abrasion of the metal seat ring in close contact with the valve disk. It is about a valve.

In general, a butterfly valve is installed on a passage through which a fluid, for example, water, oil, or gas, flows to open or close the flow of a fluid, and has a feature of using less installation space than other valves.

In addition, butterfly valves made for high temperature and pressure use metal seats instead of rubber or teflon.

In the case of such a metal seat ring, it is difficult to completely seal it, thereby allowing a constant leakage.

1 and 2 illustrate a conventional high temperature and high pressure butterfly valve.

As shown in the figure, the butterfly valve includes a valve body 52 having a fluid passage 54 therethrough so that fluid flows from one side to the other, and the fluid passage 54 of the valve body 52. A valve disk 56 that opens or closes, and is fixed to the valve disk 56 with a key 58 and a taper pin 60 to allow the valve disk 56 to flow through the fluid passage 54 of the valve body 52. The valve shaft 62 for opening and closing the inside and the thrust bearing device 64 and the packing 66 are assembled through the valve body 52 and the valve shaft 62 to maintain the rotation and airtight of the valve shaft 62. ) Consists of the main components.

In addition, the sealing structure of the valve disk 56, the gasket 70 is installed in the groove formed around the valve disk 56, a plurality of metal seat ring 72 is located thereon and the retainer 74 is bolted ( 76) is fastened.

On the other hand, the valve shaft 62 can be manually or automatically rotated to open or close the valve disc 56, so that a conventional handle (lever) or an operation unit (drive means), not shown, at the upper end of the valve shaft 62. This is installed.

The conventional butterfly valve 50 configured as described above is a state in which the flow of the fluid is completely opened when the valve disc 56 is rotated 90 degrees with respect to the radial direction of the fluid passage 54 in the valve body 52. Becomes

That is, when the valve disk 56 is in the fully open state of the fluid passage 54, the passage flow rate of the fluid is maximum.

When the valve shaft 62 is rotated 90 degrees by the operation unit (not shown) in the above state, the valve disk 56 completely closes the fluid passage 54 of the valve body 52, thereby making the butterfly valve ( The flow of fluid that flowed through 50) is interrupted.

In the conventional butterfly valve 50 configured as described above, when the valve disc 56 shuts off the fluid passage 54, the metal seat ring 72 provided on the valve disc 56 seals the fluid passage 54. Since the sealing surface 54a and the metal seat ring 72 are made of metal to metal, it is difficult to completely seal the metal sheet to allow some liquidity. When the ring 72 is in close contact with the sealing surface 54a, the metal seat ring 72 is pressed while pushing a predetermined distance, thereby causing abrasion due to the friction of the metal seat ring 72.

Therefore, the present invention was devised to solve the problems of the prior art as described above, when the valve disc closes the fluid passage, the seat ring and the valve disc closes the fluid passage when the valve disc moves on the valve shaft and is installed on the valve body. It is an object of the present invention to provide a butterfly valve that closely adheres to the metal seat ring to shut off the fluid and at the same time eliminate the metal friction between the valve disc and the metal seat ring in the fluid blocking operation of the valve disc to greatly extend the life of the valve. .

In order to achieve the above object, the present invention,

A valve disc for opening and closing the fluid passage by being installed through a valve shaft that is airtightly and rotatably installed in a valve body having a fluid passage therethrough so that fluid flows from one side to the other,

Separating the valve shaft up and down and forming a square shaft portion at each end,

The upper and lower connecting blocks are integrally formed on one surface of the valve disk to connect the valve shaft in a vertical direction, and the square shaft portion is inserted into the upper and lower connecting blocks so that the valve disk can be moved finely with respect to the square shaft portion. To form a square groove having a microspace,

A groove is formed in a direction perpendicular to the rectangular groove, and an elastic member is installed to block the vibration of the valve disc caused by fluid pressure by allowing the rectangular shaft portion to be installed with a repulsive force in the rectangular groove,

The metal seat ring in close contact with the inclined sealing surface of the valve disk is installed to be movable with a gap (gap) with the valve disk through a first step formed in the fluid passage,

It is characterized in that it comprises a retainer ring which is fixed to the fastening means through the second step formed in the fluid passage to hold the metal seat ring and at the same time hermetic.

The elastic member is characterized in that the spring.

It characterized in that the seat ring is further provided with a non-return seat ring to prevent back pressure of the fluid flowing through the step of the valve body.

1 is a cross-sectional view of a conventional butterfly valve.

Figure 2 is a perspective view of the metal sheet ?? shown in FIG.

3 is a partially exploded perspective view of a butterfly valve of the present invention.

4 is a perspective view of a butterfly valve of the present invention.

FIG. 5 is a rear perspective view of the valve disc shown in FIG. 3. FIG.

Figure 6a, Figure 6b is a state diagram of the butterfly valve of the present invention.

Figure 7 is a modified example of the seat ring of the present invention.

<Explanation of symbols for the main parts of the drawings>

10 butterfly valve 12 valve body

14 fluid passage 14a first step

14b: second step 16: valve shaft

16a: square shaft portion 18: valve disc

20: connecting block 22: spring

26: metal seat ring 28: retainer ring

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in Figures 3 to 6b, reference numeral 10 shows the entire high temperature and high pressure butterfly valve of the present invention.

Reference numeral 12 denotes a valve body, and the valve body 12 is formed with a fluid passage 14 in the form of a through hole so that fluid can flow from one side to the other.

In the valve body 12, the valve shaft 16 is installed to be separated up and down with the center of the fluid passage 14 vertically, and the valve shaft 16 is installed to be airtight and rotatable in the valve body 12. The square shaft portion 16a is formed by processing the portion exposed by the fluid passage 14 of the valve shaft 16.

Reference numeral 18 is a valve disk, the upper and lower connecting block 20 for connecting the valve shaft 16 in the vertical direction on one surface of the valve disk 18 is integrally formed, the upper and lower connecting blocks The square shaft portion 16a is inserted into the square groove 20a having the microcavity S so that the valve disk 18 can be moved finely with respect to the square shaft portion 16a.

In addition, a groove 20b is formed in the rectangular groove 20a in a right angle direction, and the square shaft portion 16a is installed in the groove 20b with a repulsive force in the square groove 20a so that the valve disk may be caused by fluid pressure or the like. A spring 22 is provided as an elastic member to block the vibration and noise of the 18.

Reference numeral 26 denotes a metal seat ring, wherein the metal seat ring 26 is formed with an inclined sealing surface 26a corresponding to the inclined sealing surface 18a formed around the valve disc 18 to form the valve body. The second step 14b formed in the fluid passage 14 is installed to be movable with a gap (gap) with the valve disc 18 through the first step 14a formed in the fluid passage 14 of (12). Is retained by retainer rings 28 installed through.

A bolt hole 28a is drilled in the retainer ring 28 at regular intervals, and correspondingly, a screw hole 14c is formed in the second step 14b to be installed and fixed by the fastening means of the bolt 30.

Accordingly, the metal seat ring 26 is installed to be movable at intervals of about 0.2 mm or less with the retainer ?? 28 fixed to the second step 14b by the bolt 30.

In the drawings, reference numeral 36 shows a conventional control guide plate for adjusting the valve shaft 16, and 38 shows a bolt.

Referring to the effects of the present invention configured as described above are as follows.

The valve disc 18 is opened by rotating the valve shaft 16 manually or automatically, and the valve disc 18 is opened at 90 degrees with respect to the radial direction of the fluid passage 14 in the valve body 12. The rotated state completely opens the flow of the fluid so that the flow rate of the fluid is maximized.

In the open state of the valve disk 18 as described above, the valve disk 18 is supported by the repulsive force of the spring 22, and the valve disk by friction with the square shaft portion 16a, which may be generated in the microcavity S, Blocking the vibration of 18) to prevent noise.

When the valve shaft 16 is rotated 90 degrees as shown in FIG. 6A in the above state, the valve disk 18 closes the fluid passage 14 of the valve body 12 so that the fluid in the valve disk 18 can be closed. High pressure fluid pressure is applied in the flow direction.

As the fluid pressure acts on the valve disc 18 as described above, the spring 24 is compressed by the force, and the valve disc 18 moves as much as the microcavity S as shown in FIG. 6B, which is a connection block 20. Square groove (20a) formed in the) is guided on both sides of the rectangular shaft portion (16a) to move straight.

As a result, the valve disk 18 horizontally moved has the inclined sealing surface 18a closely attached to the inclined sealing surface 26a of the metal seat ring 26 while the sealing surface 26b of the metal seat ring 26 is retained. The sealing surface 28a of the 28 is in close contact with the valve disk 18 and the high pressure of the fluid pressure is maintained as the valve disk 18, the metal seat ring 26 and the retainer The rings 28 are brought into close contact with each other to provide near complete airtightness (see FIG. 6B).

As described above, when the valve disc 18 is switched from the open state to the closed state by the rotation of the valve shaft 16, the inclined sealing surface 18a of the valve disk 18 and the inclined sealing surface of the metal seat ring 26 ( 26a) is in a state of being slightly spaced apart from each other without friction with each other to prevent abrasion due to the friction of the metal seat ring 26 during the opening and closing operation of the valve disc 18.

Figure 7 shows a modified example of the seat ring of the present invention, which is formed on the one side of the seat ring 26, the backflow prevention seat ring 40 integrally formed by means of welding or the like of the valve body 12 This prevents back pressure of the fluid flowing through the step.

As described above, according to the butterfly valve of the present invention, the friction of the metal seat ring is prevented when the valve disc is opened and closed, thereby greatly extending the life due to the wear of the metal seat ring, and at the same time, the metal valve is moved to open and close the valve disc. By having a structure in close contact with the seat ??, the valve disk is in close contact with each other of the metal seat ring and the retainer ?? has an effect that the airtightness is higher.

Claims (3)

A valve disc for opening and closing the fluid passage by being installed through a valve shaft that is airtightly and rotatably installed in a valve body having a fluid passage therethrough so that fluid flows from one side to the other, Separating the valve shaft up and down and forming a square shaft portion at each end, The upper and lower connecting blocks are integrally formed on one surface of the valve disk to connect the valve shaft in a vertical direction, and the square shaft portion is inserted into the upper and lower connecting blocks so that the valve disk can be moved finely with respect to the square shaft portion. To form a square groove having a microspace, A groove is formed in a direction perpendicular to the rectangular groove, and an elastic member is installed to block the vibration of the valve disc caused by fluid pressure by allowing the rectangular shaft portion to be installed with a repulsive force in the rectangular groove, The metal seat ring in close contact with the inclined sealing surface of the valve disk is installed to be movable with a gap (gap) with the valve disk through a first step formed in the fluid passage, Butterfly valve, characterized in that it comprises a retainer ring which is fixed to the fastening means through the second step formed in the fluid passage to hold and seal the metal seat ring at the same time. 2. The butterfly valve according to claim 1, wherein the elastic member is a spring. 2. The butterfly valve according to claim 1, wherein the seat ring further includes a non-return seat ring for preventing back pressure of the fluid flowing out through the step of the valve body.