KR100757962B1 - Soft seat apparatus for butterfly valve - Google Patents

Abstract

A soft seat apparatus for a butterfly valve is provided to stably prevent water leakage for a long time by preventing a rubber seat ring from being fused and stuck. A soft seat apparatus for a butterfly valve includes a valve body(100), a disc(200), and a shaft. The valve body is connected to a pipe passage to transfer a fluid. The disc is rotatably installed in the interior of the valve body to open and close the pipe passage. The shaft is fixed to both sides of the disc and is rotatably supported by the valve body. A seat pressing coating layer(500) is formed on the inner peripheral surface of the valve body. A rubber seat ring fixed to the outer peripheral surface of the disc is attached to the seat pressing coating layer.

Description

Soft seat device of butterfly valve {SOFT SEAT APPARATUS FOR BUTTERFLY VALVE}

1 to 8 is a view showing an embodiment of a soft seat device of the butterfly valve according to the present invention,

1 is a side view of a soft seat device of a butterfly valve.

2 is a front view of the soft seat device of the butterfly valve.

3 is a longitudinal sectional view of the soft seat device of the butterfly valve;

4 is a partially enlarged longitudinal sectional view of FIG. 3;

Figure 5 is a partially exploded perspective view showing a coupling structure of the disk and the rubber seat ring.

Fig. 6 is a partially enlarged longitudinal sectional view showing a contact portion of a main body boss portion and a rubber seat ring;

FIG. 7 is a cross-sectional view taken along the line AA of FIG. 6. FIG.

8 is a perspective view showing a contact surface of a main boss portion;

Fig. 9 is a longitudinal sectional view showing another form of the soft seat device of the butterfly valve.

10 is a partially enlarged longitudinal sectional view of FIG. 9;

Fig. 11 is a longitudinal sectional view showing still another embodiment of the soft seat device of the butterfly valve.

12 is a partially enlarged longitudinal sectional view of FIG. 11;

13 to 17 is a view showing another embodiment of the soft seat device of the butterfly valve according to the present invention,

It is a side view of the soft seat apparatus of a butterfly valve.

14 is a longitudinal sectional view of the soft seat device of the butterfly valve.

15 is a partially enlarged longitudinal sectional view showing the seating shaft coupling part fixing structure of FIG.

16 is a partially enlarged longitudinal sectional view showing the structure of the soft seat of FIG. 14;

Figure 17 is a partially exploded perspective view showing a coupling structure of the disk and the rubber seat ring.

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

100 valve body 101 seat portion

110; 111, 112: main boss portion 113: shaft hole

114414: Contact surface 200: Disk

210: shaft fixing portion 211: shaft fixing groove

212: seat ring shaft engaging portion fixing groove 213: seat ring fixing groove

214: pin groove 215: pin

220: shaft fixing portion 221: shaft fixing groove

223: seat ring fixing groove 230; 231,232: shaft

250: shaft fastening means 300: drive part

400: rubber seat ring 410,420: rubber seat ring

411,421: Ring body 412,422: Hanging protrusion

413,423: ring-shaped shaft coupling portion 424: keyway

430: ring-shaped fixing member 441,451,473: bolt

440,450: ring-shaped side fixing member 460: seat ring shaft coupling portion replacement fastening means

470: arc clamper 471: fastening portion

472: fixing hole 474: key groove

475: slope 480: block type key

500: sheet pressing coating layer

The present invention relates to a soft seat device of a butterfly valve, and in particular, a sheet press coating layer such as an epoxy powder coating layer, in which a rubber seat ring fixed to an outer circumferential surface of a disk is adhered to an inner circumferential surface of a valve body, so that even at high temperature and pressure conditions, The present invention relates to a soft seat device of a butterfly valve, which has excellent durability and corrosion resistance, and in particular, does not have deformation such as adhesion due to melting and crushing of the rubber seat ring.

Conventionally used valves are formed of gray cast iron, nodular cast iron, cast steel, etc., the valve body is cast to a certain shape to machine the surface, and then to apply a paint to prevent corrosion on the inner peripheral surface of the valve body It has been manufactured by the process of shipping.

When the valve body is formed of stainless steel cast steel, the physical and chemical properties such as corrosion resistance and durability are excellent in a wide temperature and pressure range, but the manufacturing cost is greatly increased when the entire valve is made of stainless steel, and the weight becomes heavy. There was a problem that the transportation and construction is difficult and the transportation and construction costs are increased.

Therefore, the normal valve is formed of cast iron, cast steel for general valves, and such a conventional valve has a problem that the internal circumferential surface of the valve body is damaged by corrosion, erosion, and the like, and the water leakage is reduced.

In addition, coating the paint on the inner circumferential surface of the valve body is to prevent rust from the process of manufacturing and transporting the valve until the construction, and when the valve is used, the coating layer is peeled off after a while, Corrosion and wear caused by fluids could not be prevented.

Therefore, the present applicant has proposed a domestic utility model registration application (application number 20-1999-0030257) by drawing a corrosion-resistant valve in order to solve such a conventional problem and has been pre-registered.

The corrosion resistant valve is coated with a corrosion resistant element formed of a corrosion resistant metal material such as stainless steel on one inner circumferential surface of the valve body based on a fixed part of the valve body, and the rubber sheet is crimped by corrosion preventing shaft fastening means formed of a corrosion resistant metal material such as stainless steel. It has a fixed configuration.

The anti-corrosion shaft fastening means has a retaining ring formed of a corrosion-resistant metal material on the inner circumferential surface of the valve body, and an outer ring formed of a corrosion-resistant metal material that compresses a rubber sheet between the retaining ring and the rubber sheet. The protrusion formed on the retaining ring has a structure in which a bolt formed of a plurality of corrosion resistant metal materials for adjusting the pressing force of the outer ring is fixed.

Corrosion-resistant valve of the present inventors of the present invention has the advantage that the shaft fastening means for fastening the rubber sheet and the inner peripheral surface of the valve body in contact with the transfer fluid is formed of a corrosion-resistant metal material can be used without corrosion for a long time, As a result, the performance of the valve is stably maintained for a long time, and the maintenance work is easy, and the weight is lighter and less expensive than the entire body is formed of stainless steel. Therefore, it has the effect of improving the service life, reliability and competitiveness of the product.

However, the corrosion resistant valve is coated on one side of the inner circumferential surface of the valve body with an anticorrosion element formed of a corrosion resistant metal material such as stainless steel, and the rubber sheet is pressed and fixed by an anticorrosion shaft fastening means formed of a corrosion resistant metal material such as stainless steel. The number of parts used, the configuration is complicated, the productivity is low, there was a problem that the manufacturing cost increases.

The present invention was devised to solve the above-mentioned problems and defects, and a sheet compression coating layer such as an epoxy powder coating layer is formed on the inner circumferential surface of the valve body to closely adhere a rubber seat ring fixed to the outer circumferential surface of the disk. An object of the present invention is to provide a soft seat device of a butterfly valve that has excellent durability and corrosion resistance even under high temperature and pressure conditions, and in particular, does not have deformation such as adhesion due to melted rubber seat ring, and thus leak leakage is maintained for a long time.

In order to achieve the above object, the soft seat device of the butterfly valve according to the present invention includes a valve body connected to a conduit for fluid transfer, and a disk rotatably installed to open and close the conduit in the valve body. In the seating device of a butterfly valve, a sheet press coating layer such as an epoxy powder coating layer is formed on the inner circumferential surface of the valve body in close contact with a rubber seat ring fixed to the outer circumferential surface of the disk.

For example, in a small butterfly valve, a seating shaft engaging portion fixing groove is formed at an outer end of the shaft fixing groove of both shaft fixing portions of the disk, and the rubber seat is formed in the sheeting shaft engaging portion fixing groove of both shaft fixing portions. The ring-shaped shaft coupling portion of the ring is inserted and fixed through a plurality of pins, and the ring body of the rubber seat ring is inserted and fixed in the seat ring fixing groove formed on the outer circumferential surface of the disk.

In the large butterfly valve, the ring-shaped shaft coupling portion of the rubber seat ring is disposed at the outer side of the shaft at both ends of the shaft fixing portions of the disk and fixed by the seating shaft coupling replacement replacement means so that it can be easily replaced as necessary. .

The seat ring shaft engaging portion replacement fastening means is a bolt of the ring-shaped shaft coupling portion of the rubber seat ring is disposed on the outer side of the shaft at the end of the shaft fixing portion of the disk, the arc-shaped clamper is disposed on both sides and inserted into the fixing hole of the fastening portion of both ends It is configured to be fastened to the disk through the ring-shaped side fixing member and the ring body.

A plurality of key grooves having a rectangular cross section is formed on an outer circumferential surface of the ring-shaped shaft engaging portion of the rubber seat ring and an inner circumferential surface of an arc-shaped clamper, and each key groove is formed by inserting and fixing a block-type key.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail as follows.

1 to 8 is a view showing an embodiment of a soft seat device of the butterfly valve according to the present invention, Figure 1 is a side view of the soft seat device of the butterfly valve, Figure 2 is a soft seat of the butterfly valve A front view of the seat device is shown, FIG. 3 is a longitudinal sectional view of the soft seat device of the butterfly valve, FIG. 4 is a partially enlarged longitudinal sectional view of FIG. 3, and FIG. 5 is a coupling structure of the disk and the rubber seat ring. A partially exploded perspective view is shown.

6 is a partially enlarged longitudinal sectional view showing the contact portion of the main body boss portion and the rubber seat ring, FIG. 7 is a cross-sectional view taken along the line A-A of FIG. 6, and FIG. 8 is a perspective view showing the contact surface of the main boss portion. Is shown.

As shown in the drawing, a disk 200 for opening and closing the pipeline is rotatably installed in the valve body 100.

The disk 200 is rotatably coupled to the body boss parts 110; 111 and 112 of the valve body 100 by the shafts 230; 231 and 232 fixed to both shaft fixing parts 210, and the one side shaft 231 is One main body boss 111 protrudes outward and is connected to the driving unit 300.

A rubber seat ring 400 is fixed to an outer circumferential surface of the disk 200, and a seat crimp coating layer 500 is pressed to an inner circumferential surface of the valve body 100 so that the rubber seat ring 400 can block leakage in the long term. Formed.

Shaft fixing grooves 211 are formed in both shaft fixing portions 210 of the disk 200, and end portions of the shafts 230; 231 and 231 are respectively inserted into the shaft fixing means 250.

The sheet compression coating layer 500 is preferably formed of an epoxy powder coating layer.

This epoxy powder coating layer has strong chemical resistance such as acid resistance and corrosion resistance, and can be slipperily coated on the inner circumferential surface of the valve body 100, and repeatedly with the seat ring 400 due to the repeated opening and closing action of the disk 200. Since the coating layer is stably maintained even after phosphorus compression, the leakage blocking force is stably maintained for a long time.

The seat crimp coating layer 500 may be formed using another material as long as it is a material that can compensate for the thermal resistance such as corrosion and abrasion according to the material of the valve body 100 in addition to the epoxy powder coating layer.

The rubber seat ring 410 illustrated in FIGS. 1 to 5 is formed in a plug-shaped cross section provided with a locking protrusion 412 at the inner end of the ring body 411, and the disk 200 as shown in FIGS. 1 and 2. ) Is coupled to the center line of the shafts 230; 231 and 232, and ring-shaped shaft coupling portions 413 are formed at both sides of the ring body 411.

As shown in FIGS. 4 and 5, the seating fixing groove 213 of the disk 200 is formed in the same cross-sectional shape as the rubber seating ring 400, and the rubber is formed in the sheeting fixing groove 213 of the disk 200. The seat ring 400 is inserted and the ring-shaped fixing member 430 is inserted so that the rubber seat ring 410 is stably fixed.

The ring-shaped fixing member 430 is separated into three divided bodies to be inserted into the seat ring fixing groove 213.

A seating shaft coupling part fixing groove 212 is formed at an outer end of the shaft fixing groove 211 of both shaft fixing parts 210 of the disk 200, and the sheeting shaft of the both shaft fixing parts 210 is formed. The ring-shaped shaft coupling portion 413 of the rubber seat ring 400 is inserted and fixed to the coupling portion fixing groove 212 via the plurality of pins 215.

A plurality of pins 215 are fitted into the seat ring shaft coupling part fixing groove 212 of the shaft fixing part 210 and the ring type shaft coupling part 413 of the rubber seat ring 400 (for example, each of four Pin grooves 214 and 415 are formed to correspond to each other.

In addition, as shown in FIGS. 1 and 6 to 8, a contact surface 414 for contacting the ring-shaped shaft coupling portion 413 of the rubber seat ring 410 and the main boss portions 110; 111 and 112 of the valve body 100 is in contact with each other. 114 is formed in the inclined surface is coupled to be in close contact with each other.

The main bosses 110, 111, and 112 of the valve body 100 form shaft holes 113 to insert the shafts 230, 231, and 232, and then the inner circumferential surface of the valve body 100 and the main bosses 110, 111, and 112. The contact portion 114 is formed as an inclined surface by tapering the corner portion of the inner end of the contact.

When the contact surface 114 of the main body bosses 110; 111 and 112 is formed, for example, the shaft holes 113 of the main body bosses 110; 111 and 112 of the valve body 100 are bored to form a valve. An edge portion where the inner circumferential surface of the main body 100 and the inner end portions of the main bosses 110; 111 and 112 are tapered into a bite orthogonally coupled to the end of the boring bar to form a contact surface 114 as an inclined surface.

Herein, the contact surfaces 114 of the main bosses 110; 111 and 112 are inner diameter parts of the valve body 100 at the center of the shaft hole 113 of the main bosses 110; 111 and 112, as illustrated in FIGS. 6 to 8. It is formed to gradually increase the width of the inclined contact surface 114 while going in both longitudinal directions along the.

The seat ring fixing groove 213 of the disk 200 is formed in the same section as the rubber seat ring 400 so that the rubber seat ring 410 is tightly fitted into the seat ring fixing groove 213 to separate the fixing member. It can also be fixed without the (430).

The soft seat device of the butterfly valve according to the present invention is installed in the pipeline, and when the leakage is blocked, the disk 200 to the seat pressing coating layer 500 such as an epoxy powder coating layer formed on the inner peripheral surface of the valve body 100 The rubber seat ring 410 is crimped to block the leakage, and the protruding portion of the rubber seat ring 410 is not formed on the cylindrical inner circumferential surface of the valve body 100, and the longitudinal cross-sectional shape of the surface is generally flat. Even if it is formed in the form, it completely blocks the leak.

In addition, the seat pressing coating layer 500, such as the epoxy powder coating layer formed on the inner circumferential surface of the valve body 100, has excellent durability and corrosion resistance even under high temperature and pressure conditions, and in particular, adhesion of the rubber seat ring 410 to melt and entangle. As there is no deformation, leakage blocking force is maintained for a long time.

FIG. 9 is a longitudinal sectional view showing another form of the soft seat device of the butterfly valve, FIG. 10 is a partially enlarged longitudinal sectional view of FIG. 9, and FIG. 11 is another form of the soft seat device of the butterfly valve. A longitudinal cross-sectional view is shown, and FIG. 12 shows a partially enlarged longitudinal cross-sectional view of FIG.

As shown in the figure, in the case where the disk 200 is a butterfly valve of the type coupled to the shaft wire of the shaft 230, the ring-shaped shaft coupling portion 413 for coupling the shaft to the rubber seat ring 410 Since the rubber seat ring 410 is formed in an annular shape having the same cross-section as a whole, the rubber seat ring 410 of a simple form is inserted into the seat ring fixing groove 213 of the disk 200. It is composed.

In addition, the inner peripheral surface of the valve body 100 has a configuration in which the seat portion 101 is protruded so that the rubber seat ring 410 of the disk 200 is pressed, and the seat pressing coating layer 500 is coated on the inner peripheral surface.

The soft seat device of the butterfly valve according to another embodiment of the present invention is a simple rubber seat ring 410 without the ring-shaped ring shaft coupling portion 413 (FIGS. 1 and 5) in the disk 200. Since it is to combine the assembly can be easily facilitated, since the seat portion 101 is formed on the inner peripheral surface of the valve body 100, the rubber seat ring 410 of the disk 200 is more stably pressed.

In addition, in FIGS. 9 and 10, the rubber seat ring 410 is coupled to the disk 200, and the rubber seat ring 410 of a simple form is closely inserted into the seat ring fixing groove 213 of the disk 200. It has a simple structure combined without using the fixing member 430 (FIG. 3 and FIG. 4), and in FIG. 11 and FIG. 12, the ring-shaped side fixing member 440 is coupled with the rubber seat ring 410 to the disk 200. Is fastened with a bolt 441, and has a structure, and when the rubber seat ring 410 is coupled to the disk 200 while implementing the present invention as described above, additional fixing members 430 and 440 as necessary. Can be tightened with or without.

13 to 17 is a view showing another embodiment of the soft seat device of the butterfly valve according to the present invention, Figure 13 is a side view of the soft seat device of the butterfly valve, Figure 14 is a soft seat of the butterfly valve The longitudinal cross-sectional view of the seating device is shown, FIG. 15 is a partially enlarged longitudinal sectional view showing the fixing structure of the seat ring shaft coupling portion of FIG. 14, and FIG. 16 is a partially enlarged longitudinal sectional view showing the soft seat portion structure of FIG. FIG. 17 is a partially exploded perspective view showing a coupling structure of a disk and a rubber seat ring.

Soft seat device of the butterfly valve according to another embodiment shown in this configuration is configured to facilitate the replacement of the rubber seat ring 400 in the large butterfly valve.

In another such embodiment, the rubber seat ring 420 is formed with a plug-shaped cross section provided with a locking protrusion 422 at the inner end of the ring body 421, as shown in the disk 200 is the shaft 230 When coupled to the center line of the 231,232 has a ring-shaped shaft coupling portion 423 is formed in both sides of the ring body 421 is formed in a ring shape.

Shaft fixing grooves 221 into which shafts 230; 231 and 232 are inserted are formed in both shaft fixing parts 220 of the disk 200, and rubber seat rings 420 are formed at ends of both shaft fixing parts 220. Ring-shaped shaft coupling portion 423 is disposed to the outer side of the shaft (230; 231, 232) is fastened by the seat ring shaft coupling replacement replacement means 460, the outer peripheral portion of the disk 200 is ring-shaped side fixing member 450 The rubber seat ring 420 is inserted into and fixed to the seat ring fixing groove 223 (FIGS. 16 and 17) formed by the bolt 451 and formed between the outer periphery of the disk 200.

The ring-shaped shaft coupling portion 423 of the rubber seat ring 420 is molded in a form in which one side is cut out so as to be replaced in a state in which the shafts 230; 231 and 232 are coupled to the disk 200, or one side is cut in the field. Will be used.

The seat ring shaft coupling portion replacement fastening means 460 has a ring-shaped shaft coupling portion 423 of the rubber seat ring 420 at the ends of both shaft fixing portion 220 of the disk 200 shaft (230; 231, 232). Ring-shaped side fixing member 450 and the ring body 421 are arranged outside the () and the arc-shaped clamper 470 is disposed on both sides and inserted into the fixing hole 472 of the fastening portion 471 of both ends. ) Is fastened to the nut hole formed in the disk 200.

And the key groove 424 for inserting the block-shaped key 480 having a rectangular cross section on the outer peripheral surface of the ring-shaped shaft coupling portion 423 of the rubber seat ring 420 and the inner peripheral surface of the arc-shaped clamper 470 as shown in FIG. 474 are formed symmetrically in the radial direction on the left and right sides, and the block-type key 480 is inserted and fixed in each of the key grooves 424 and 474.

The key groove 474 formed on the inner circumferential surface of the arc-shaped clamper 470 is formed with an inclined surface 475 so that one side thereof can be easily assembled at both sides.

When the ring-shaped shaft coupling portion 423 of the rubber seat ring 420 is coupled to the disk 200, the ring-shaped shaft coupling portion 423 of the rubber seat ring 420 is fixed to both shafts 220 of the disk 200. After placing the block-shaped key 480 radially inward in the key groove 424 formed on the outer circumferential surface of the ring-shaped shaft engaging portion 423 of the rubber seat ring 420, the arc-shaped clamper 470 is coupled from both sides in the horizontal direction to the disk 200 by bolts 473, wherein both sides of the key grooves 474 formed on the upper, lower, left, and right sides of both arc-shaped clampers 470. If the outer surface distant from the horizontal center line of FIG. 15 is not formed as the inclined surface 475, the key groove 474 of the arc-shaped clamper 470 is caught by the block-type key 480, and thus the arc-shaped clamper 470 is opened. It will not be possible to combine, but because the upper and lower outer sides of each key groove 474 is formed as the inclined surface 475 This is made possible.

In FIG. 12, reference numeral 251 denotes an O-ring.

The soft seat device of the butterfly valve according to another embodiment of the present invention is a circle fastened to both sides of the shaft fixing portion 220 of the disk 200 when the rubber seat ring 420 needs to be replaced with a long-term use. Loosen the arc clamper 470 by releasing the bolts 473, and remove the ring-shaped side fixing member 450 fastened to the outer periphery of the disk 200 by releasing the bolt 451 to remove the rubber seat ring 420. After removing), it is used to replace with a new rubber seat ring (420).

When the new rubber seat ring 420 is engaged, the ring-shaped shaft engaging portion 423 of the rubber seat ring 420 is inserted at the end of the shaft fixing portion 220 outward of the shafts 230; The ring body 421 of 420 is inserted into the seat ring fixing groove 223a formed in the outer periphery of the disk 200.
Subsequently, the block-shaped key 480 is inserted into the key grooves 424 and 474 having a plurality of rectangular cross-sections formed in the ring-shaped shaft coupling portion 423 of the rubber seat ring 420, and then the ring-shaped shaft coupling portion 423 is inserted. The arc-shaped clampers 470 are disposed on both sides of the outer circumferential surface thereof. Then, the ring-shaped shaft coupling portion 423 of the rubber seat ring 420 is fixed while the block-type key 480 is fixed to the key grooves 424 and 474 of the rubber seat ring 420 and the arc-shaped clamper 470. It is tightly fixed to the shaft (230; 231,232).
Then, the ring-shaped side fixing member 450 is disposed outside the ring body 421 of the rubber seat ring 420 at the outer circumferential edge of the disk 200.

Then, the bolt 473 is inserted into the fixing hole 472 of the fastening portion 471 of the both ends of the arc-shaped clamper 470 and fastened to the nut hole formed in the ring-shaped side fixing member 450 and the disk 200, When the bolt is fastened between the ring-shaped side fixing member 450 and the disk 200, the rubber seat ring 420 replacement operation is completed.

delete

The soft seat device of the butterfly valve according to another embodiment of the present invention can be easily replaced when it is necessary to replace the rubber seat ring 420 as it is used for a long time, and the rest of the configuration and operation is the same as the embodiment .

The present invention has been described above by illustrating a flanged butterfly valve, but can be applied to a wafer-type butterfly valve, it can be applied to other valves in addition to the butterfly valve.

The soft seat device of the butterfly valve according to the present invention is installed in the pipeline, and when the leakage is blocked, the disk 200 to the seat pressing coating layer 500 such as an epoxy powder coating layer formed on the inner peripheral surface of the valve body 100 Rubber seat ring (400; 410, 420) of the compression is to block the leakage, the protruding portion of the rubber seat ring 400 is not formed on the cylindrical inner peripheral surface of the valve body 100, the longitudinal cross-sectional shape of the surface as a whole Even if it is formed in a flat shape, the leak is completely blocked.

In addition, the seat pressing coating layer 500 such as the epoxy powder coating layer formed on the inner circumferential surface of the valve body 100 is excellent in durability and corrosion resistance even under high temperature and pressure conditions, and in particular, adhesion of the rubber seat ring 400 to melt and entangle. As there is no deformation, leakage blocking force is maintained for a long time.

Claims (11)

A valve body 100 connected to the conduit for fluid transfer, a disk 200 rotatably installed to open and close the conduit in the valve body 100, and fixed to both sides of the disk 200, and It is configured to include a shaft rotatably supported on the valve body 100, the seat compression coating layer 500 is formed on the inner peripheral surface of the valve body 100 is in close contact with the rubber seat ring fixed to the outer peripheral surface of the disk 200 Become, A seating shaft coupling part fixing groove 212 is formed at an outer end of the shaft fixing groove 211 of both shaft fixing parts 210 of the disk 200, and the sheeting shaft coupling of the both shaft fixing parts 210 is formed. The ring-shaped shaft coupling portion 413 of the rubber seat ring 410 is inserted into and fixed to the secondary fixing groove 212 through the plurality of pins 215, and the sheeting fixing groove formed on the outer circumferential surface of the disk 200 ( 213 is a soft seat device of the butterfly valve, characterized in that the ring body 411 of the rubber seat ring 400 is inserted and fixed. The soft seating device of a butterfly valve according to claim 1, wherein the seat pressing coating layer (500) is formed of an epoxy powder coating layer. delete The ring-shaped shaft coupling portion 423 of the rubber seat ring 420 is disposed outwardly of the shafts 230, 231 and 232 at the ends of both shaft fixing portions 220 of the disk 200. Soft seat device of the butterfly valve, characterized in that the ring shaft coupling portion replacement fastening means 460 is configured. The butterfly according to claim 1, wherein the rubber seat ring 410 having the locking protrusion 412 is pressed against the entire surface of the seat ring fixing groove 213 formed on the outer circumferential surface of the disk 200. Soft seat device of the valve. According to claim 1, wherein the rubber seat ring 410 and the ring-shaped fixing member 430 having a locking projection 412 in the seat ring fixing groove 213 formed on the outer circumferential surface of the disk 200 is inserted and configured together Soft seat device of butterfly valve. The contact surface 414, 114 of claim 1, wherein the ring-shaped shaft coupling portion 413 of the rubber seat ring 410 and the body boss portions 110, 111, and 112 of the valve body 100 are in contact with each other. Soft seat device of the butterfly valve, characterized in that formed in the inclined surface to be in close contact. The method of claim 4, wherein the seat ring shaft coupling portion replacement fastening means 460 is a ring-shaped shaft coupling portion 423 of the rubber seat ring 420 at the end of the shaft fixing portion 220 of the disk 200 The ring-shaped side fixing member 450 is disposed outside the shafts 230 and 231 and 232, and the bolts 473 are inserted into the fixing holes 472 of the fastening portions 471 at both ends by the arc-shaped clampers 470. And soft seat device of the butterfly valve, characterized in that configured to be fastened to the disk 200 through the ring body (421). The contact surface 114 of the main body boss portion (110; 111, 112) is a longitudinal direction along the inner diameter of the valve body 100 at the center of the shaft hole 113 of the main body boss portion (110; 111, 112) Soft seat device of the butterfly valve, characterized in that formed so as to gradually increase the width of the inclined contact surface 114 to the outside. The key groove 424 for inserting a block-type key 480 having a rectangular cross section in the outer circumferential surface of the ring-shaped shaft coupling portion 423 of the rubber seat ring 420 and the inner circumferential surface of the arc-shaped clamper 470. Butter, characterized in that the 474, 474 are formed in the radial direction in the upper, lower, left, right, respectively, and the block-type key 480 is inserted and fixed to each key groove 424, 474 Soft seat device of fly valve. delete

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