KR200297443Y1 - Ball valve sealing apparatus composed of combination seat and elastic seat - Google Patents

Abstract

The present invention relates to a composite seat sealing device consisting of a two-contact metal seat and an elastic seat of a ball valve, the valve body for opening and closing the pipeline to the ball valve body piped to the pipeline is installed in the valve so as to be opened and closed by the rotation drive element A sealing device for a valve provided to shut off a leakage amount to be below a standard allowable value when the valve body is closed, wherein the metal seat ring is supported by the seating support means on the inner circumferential surface of the ball valve body so that the valve body is closed. The pressing portion of the metal seat ring contacts the seat surface of the valve body with a predetermined pressing force, that is, a pressure set so that the amount of leakage is equal to or less than the prescribed value, and the elastic seat ring is inserted into and fixed to the ring engaging groove formed in the metal seat ring, so that the valve Two-contact metal seat and elastic seat of the ball valve configured to be pressed against the seat face of the sieve Provide a ply seat sealing device. This invention devises that when the valve body is closed, the pressing part of the metal seat ring is strongly pressed by the pressing force of the metal-to-metal primarily to the seat surface of the valve body, so that the water leakage is within a predetermined allowable value, so that the required leakage preventing performance of the product is improved. It is advantageous to provide a combination seat device having a performance far superior to the required reference performance since it is retained for a long time, and furthermore, the elastic seating is completely pressed against the seat surface of the valve body to completely block leakage. Moreover, even if the pressing force of the crimping portion of the metal seat ring against the seat surface of the valve body is weakened after being used for a long time after the valve is installed in the pipeline, the pressing force of the elastic seating ring acts as an auxiliary function, so that the leakage blocking force better than the prescribed value for a long time There is an advantage to be maintained. In addition, even after a long period of time, even if the pressing force of the metal seat ring and the elastic seat ring falls below the prescribed value, the position of the pressed part of the metal seat ring and the elastic seat ring is controlled by the elasticity of the compression spring, so that the water leaks. It has the advantage of keeping the blocking performance for a long time. Furthermore, the elastic sheet is inserted into the ring coupling groove formed in the metal sheet ring, and the elastic sheet is injected and fixed into the filling space formed by the ring coupling groove of the metal sheet ring and the hardener filling groove of the elastic sheet ring. There is an advantage that the ring can be easily assembled and fixed very easily, there is an advantage that the elastic seat ring is very firmly fixed to maintain the leak-proof force for a long time stable.

Description

BALL VALVE SEALING APPARATUS COMPOSED OF COMBINATION SEAT AND ELASTIC SEAT}

The present invention relates to a sealing device of a ball valve that is installed to block leakage when the pipeline is closed in a ball valve provided with a valve body for closing the pipeline in the valve body, in particular a metal seat ring on the inner peripheral surface of the ball valve body When the valve body is closed by the seating support means and the valve body is closed, the pressing portion of the metal seat ring contacts the seat surface of the valve body at a predetermined pressure such that a leakage amount is equal to or less than a standard prescribed value, and the metal seat ring The elastic seating ring is inserted into and fixed to the ring coupling groove formed in the valve body so as to be auxiliary to the seat surface of the valve body. The elastic seating ring is inserted into the ring coupling groove formed in the metal seating ring, and the ring coupling groove of the metal seating ring. Two-contact metal seat of the ball valve to inject and fix the liquid curing agent into the filling space formed by the filling groove of the elastic seat ring A sheet of an elastic composite sheet relates to a sealing device.

In general, a butterfly valve and a ball valve are rotatably coupled to a valve body such as a valve body and a valve body that open and close a pipeline in the valve body, and a rubber seat ring in which the seat surface of the valve body is compressed to the inner circumferential surface of the valve body. This is a fixed configuration.

Such a conventional valve is difficult to expect a perfect leak blocking by sealing only the rubber seat, in particular, the rubber seat is abrasion due to friction over time and water tight function is rapidly reduced. Therefore, the repair work such as repair or replacement of the sheet is frequent and there is an uneconomical problem that excessive management costs are expended accordingly.

In order to solve such a problem, Korean Utility Model Registration No. 20-0254812 discloses that a valve body assembled to both rotation shafts inside a valve body is rotated by a driving device, and rubber is formed along an outer circumference of the valve body. A butterfly valve in which a seat is fixed to the main body seat inside the valve body, the butterfly valve being assembled to the valve body at the rear of the main body seat, and having a double seat for the butterfly valve equipped with a metal auxiliary seat having a close contact plate having elastic force on the outer periphery. Sealing devices are known.

Such a conventional double sealing device is provided with a metal sheet auxiliary to assist the leakage blocking force by the rubber sheet, there is a complicated configuration, the metal sheet is installed in the rear of the valve body to provide a close contact of the metal sheet Since it is fixed at a predetermined position so as to contact the outer peripheral surface end of the valve body, there is a problem that it is difficult to maintain the leak-tight force by the metal sheet to be stable, assembly assembly and maintenance is difficult.

On the other hand, in fixing the seat ring in the inside of the valve body in the prior art, a structure for fastening the seat ring using a fastening ring and a plurality of bolts is used, such a fastening structure is, for example, Korea Utility Model Publication No. 20 As described in the butterfly valve double seat ring watertight device known from -0252351, the seat ring is inserted into the fastening groove of the seat ring mounting portion formed on the inner circumferential surface of the valve body, and the annular fastening ring is moved outward of the seat ring. It has a configuration in which a plurality of bolts are interposed therebetween.

However, the structure of fastening the seat ring by using the fastening ring and bolt is very difficult to fasten, which requires a lot of assembly time, which leads to a decrease in productivity, and a large amount of parts required to increase the cost. There was a disadvantage in terms of cost and cost.

Moreover, the sealing devices known from the above-mentioned Korean Utility Model Registration No. 20-0254812, Korean Utility Model Registration No. 20-0252351 as described above relates to a butterfly valve, which is not suitable for use in ball valves. There was this.

The present invention was devised to solve the conventional problems and defects as described above. When the metal seat ring is supported by the seating support means and the valve body is closed, the metal seat ring is pressed against the inner circumferential surface of the ball valve body. Further, the seat surface of the valve body is contacted with a predetermined pressing force, that is, a pressure set so that the amount of leakage is equal to or less than the prescribed value, and the elastic seat ring is inserted into and fixed to a ring engaging groove formed in the metal seat ring, It is to provide a composite seat sealing device consisting of a two-contact metal seat and an elastic seat of the ball valve to be auxiliary compression.

In addition, another object of the present invention is to insert an elastic seat ring into the ring coupling groove formed in the metal seat ring, and injects a liquid curing agent into the filling space formed by the ring coupling groove of the metal seat ring and the hardener filling groove of the elastic seat ring It is to provide a composite seat sealing device made of a two-contact metal seat and an elastic seat of the ball valve to be fixed by.

1 is a cross-sectional view showing an embodiment in which the composite seat sealing device made of a two-contact metal seat and an elastic seat of the ball valve according to the present invention applied to the ball valve.

FIG. 2A is an enlarged longitudinal sectional view of portion “A” of FIG. 1; FIG.

FIG. 2B is a partially enlarged longitudinal sectional view of FIG. 2A; FIG.

3 is a partially cutaway perspective view of the metal seat ring.

4 and 5 are cross-sectional views showing a process of fixing the elastic seat ring to the metal seat ring.

Figure 6 is a cross-sectional view showing another embodiment of applying a composite seat sealing device made of a two-contact metal seat and an elastic seat of the ball valve according to the present invention.

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

100: ball valve body 111e ~ 11g: stepped portion

120: valve body 121: seat surface

161: O-ring 174,175: interval

200: seating support means 240: filling space

241 through hole 250 metal sheeting

251 ring engagement groove 252 seat portion

254,254a, 254b: step 255: sealing groove

256; 256a, 256b: crimping portion 260: contact ring

261: step 262: insertion groove

263: end surface 270: spring

300: elastic seating 300 ': O-ring

301: hardener filling groove 302: inner surface

303: wing 310: hardener

In order to achieve the above object, the composite sheet sealing apparatus of the two-contact metal sheet and the elastic sheet of the ball valve according to the present invention is capable of opening and closing the valve body for opening and closing the conduit to the ball valve body piped to the conduit by a rotation driving element. In the sealing device of the ball valve provided to shut off the leakage when the valve body is closed in the valve is installed so as to be less than the standard allowance, the metal seat ring is supported by the seating support means on the inner peripheral surface of the ball valve body When the valve body is closed, the crimping portion of the metal seating ring contacts the seat surface of the valve body with a predetermined pressing force, that is, a pressure set so that the amount of leakage is less than the prescribed value, and the elastic seating ring is formed in the ring engaging groove formed in the metal seating ring. It is inserted and fixed, and it is comprised so that it may be auxiliary-squeezed to the seat surface of the said valve body.

A ring coupling groove is formed in the metal seat ring, and an elastic seat ring having a hardener filling groove is inserted into the ring coupling groove so that a hardening agent is formed by an inner surface of the ring coupling groove of the metal seat ring and a hardener filling groove of the elastic seat ring. The space for filling is formed in a sealed form, and the metal sheeting has a pair of through holes communicating with the filling space in upper and lower portions thereof, and is elastically formed by a hardening agent filled and cured in the filling space. The seat ring is fixed to the ring coupling groove of the metal seat ring.

Hereinafter, with reference to the accompanying drawings of the present invention in detail as follows.

1 is a cross-sectional view showing an embodiment in which the composite valve sealing apparatus consisting of a two-contact metal seat and an elastic seat of the ball valve according to the present invention is applied to the ball valve, Figure 2a is a partially enlarged longitudinal cross-sectional view of Figure 1, Figure 2b 2A is a partially enlarged longitudinal sectional view of FIG. 2A, and FIG. 3 is a partially cutaway perspective view of the metal seat ring, and FIGS. 4 and 5 are cross-sectional views illustrating a process of fixing the elastic seat ring to the metal seat ring. 6 is a cross-sectional view showing another embodiment in which the composite seat sealing device made of the two-contact metal seat and the elastic seat of the ball valve according to the present invention is applied to the ball valve.

First, referring to FIGS. 1 and 2A and 2B, a valve body 120 for opening and closing a pipeline to a valve body 100 that is piped to a pipeline is installed in a valve that can be opened and closed by a rotation driving element (not shown). In the sealing device of the ball valve provided to block the leakage amount to be below the standard allowable value (regular value) when the valve body 120 is closed, the metal seat ring 250 is seated on the inner peripheral surface of the valve body 100 When the valve body 120 is closed by being supported by the ring support means 200, the pressing portions 256a and 256b of the metal seat ring 250 are seated surface 121 of the valve body 120. Contact with a predetermined compressive force, that is, a pressure set so that the amount of leakage is equal to or less than the reference allowable value, and the elastic seat ring 300 is inserted into and fixed to the ring coupling groove 251 formed in the metal seat ring 250 so that the valve body ( 120 is configured to be auxiliary pressed to the seat surface 121 .

An elastic sheet ring 300 having a hardener filling groove 301 is inserted into the ring coupling groove 251 of the metal seat ring 250, so that the inner surface and the elastic sheet of the ring coupling groove 251 of the metal seat ring 250 are inserted. A pair of the space 240 for filling the hardener is formed in a sealed form by the hardener filling groove 301 of the ring 300, and the metal seat ring 250 communicates with the filling space 240. The through hole 241 of the upper and lower portions, the elastic seat ring 300 is coupled to the ring seating groove of the metal sheet ring 250 by the hardener 310 is filled and cured in the filling space 240 It is a structure fixed to 251.

Hereinafter, referring to FIGS. 2A to 5, the seating support means 200 may include metal seats on stepped stepped portions 111e, 111f, and 111g formed on the inner circumferential surface of the ball valve body 100b. The ring 250 and the contact ring 260 are inserted to engage the contact portion 252 of the metal seat ring 250 to engage the step portion 261 of the contact ring 260, and formed on the contact ring 260. In the insertion groove 262, a spring 270 for pressing the pressing portions 256a and 256b of the metal seat ring 250 to the seat surface 121 of the valve body 120 is a stepped stepped portion 111g. It is configured to be inserted in such a manner that one end thereof is in contact with each other.

Stepped stepped portions 111e, 111f, and 111g of the ball valve body 100b are formed in multiple stages in such a manner that heights are sequentially increased from the inside to the outside, and the metal seat ring 250 has a ball. Stepped portions 254a and 254b corresponding to the stepped portions 111e and 111f of the valve body 100b are formed and coupled to each other in an axial direction.

In addition, the sealing groove 255 is formed by the stepped portion 111f of the ball valve body 100b, the stepped portions 254a and 254b of the metal seat ring 250, and the front end surface 263 of the contact ring 260. ) Is formed, and the O-ring 161 is inserted into the sealing groove 255, and the sealing groove 255 is formed to have a width larger than the diameter of the O-ring 161 so that the O-ring 161 is the sealing groove 255. It is possible to flow from side to side inside.

In addition, a predetermined interval 174 is formed between the stepped portion 111f of the ball valve body 100b and the stepped portion 254 of the metal seat ring 250, respectively, and the stepped portion of the ball valve body 100b. A gap 175 is also formed between 111g and the end of the contact ring 260.

The ring coupling groove 251 of the metal seat ring 250 is formed to have a shape in which the elastic seat ring 300 is inserted and kept stable without being pulled out.

For example, the elastic seat ring 300 is formed in a substantially triangular cross section having a curved surface and both inclined surfaces and a bottom surface in contact with the seat surface 121 of the valve body 120 to form a seat surface of the valve body 120. The contact portion 121 is formed to have a narrow and narrow width toward the bottom, and the metal seat ring 250 has a seat portion 252 formed to be inclined at a contact surface toward the seat surface 121 of the valve body 120. In addition, a ring coupling groove 251 and a pressing portion (256; 256a, 256b) is formed in the seat portion 252, and the ring coupling groove 251 of the metal seat ring 250 is the elastic sheet ring ( 300 is formed into a truncated triangular cross section having an opening, both inclined surfaces, and a bottom surface so as to be inserted and caught.

The elastic sheeting 300 is formed to have a hardener filling groove 301 having a substantially inverted V-shaped cross section and wing portions 303 on both sides thereof, and an inner surface 302 of the hardener filling groove 301 as an uneven surface. The hardener 310 formed and filled in the hardener filling groove 301 to be hardened is formed to have a rigid coupling structure by being coupled to each other in a concave-convex shape.

As such, the elastic seat ring 300 is firmly fixed so as not to be separated from the ring coupling groove 251 of the seat portion 252, and only the portion that is compressed to the seat surface 121 of the valve body 120 is the ring coupling groove. It protrudes convexly outward.

For example, rubber sheeting may be used for the elastic sheeting 300, and various other sheetings may be used. An epoxy resin may be used for the curing agent 310, and a curing agent of another material may be used. The epoxy resin may be injected into the ring coupling groove 251 of the metal sheeting 250 in a liquid state, and may be advantageously applied to the present invention since it is cured into a very solid form after injection. In addition, the valve body 120 is formed of a stainless material.

The process of assembling the elastic seat ring 300 to the metal seat ring 250 by applying the present invention as described above in more detail ring coupling groove 251 formed in an annular shape in the metal seat ring 250 as shown in FIG. ) Is inserted in a state in which the elastic sheeting 300 is retracted, that is, both wing portions 303 of the curing agent filling groove 301 are retracted.

When the elastic seat ring 300 is inserted into the ring coupling groove 251 as described above, both wings 303 of the elastic seat ring 300 are unfolded by their own elasticity as shown in FIG. 5 and the outer surface of the elastic seat ring 300 is opened. In close contact with the inner surface of the ring coupling groove 251, the engaged state is stably maintained.

Subsequently, when the curing agent 310 is injected using a conventional injector into the through hole 241 formed to communicate with the ring coupling groove 251 at one side of the metal sheeting 250, the ring coupling groove 251 and the elastic sheet are provided. The hardener 310 is injected into the filling space 240 formed by the hardener filling groove 301 of the ring 300, and at this time, the through hole formed to communicate with the ring coupling groove 251 at the other side of the metal seat ring 250. In 241, since the air inside the filling space 240 is discharged, the curing agent 310 is smoothly injected.

Since the inner surface 302 of the curing agent filling groove 301 of the elastic sheeting 300 is formed as an uneven surface, the hardening agent 310 injected into the filling space 240 is formed with an uneven surface. Is charged.

As such, when the elastic seat ring 300 is inserted into the ring coupling groove 251 of the metal seat ring 250, and the curing agent 310 is filled, the curing agent 310 is cured while maintaining a predetermined atmosphere. When completed, the metal seat ring 250 and the support ring 230 are inserted into the stepped step 110 of the valve body 100 as shown in FIGS. 2A and 2B, and the fixing ring is disposed at the outer end of the valve body 100. Fixing the 220 with the bolt 223, and fastening the fastening bolt 224 and the adjustment bolt 225 to the fixing ring 220 and the metal seat ring 250 seat surface 121 of the valve body 120 Adjust the fixed position so that the elastic seat ring 300 is in contact with the proper position.

As described above, the composite seat sealing device made of the two-contact metal seat and the elastic seat of the ball valve according to the present invention has a ball valve installed in, for example, a water supply line, so that the valve body 120 is closed as shown in FIG. 2A. When the metal seat ring 250 is pushed to the left side with reference to FIG. 2A, the pressing portions 256a and 256b of the metal seat ring 250 are pressed against the seat surface 121 of the valve body 120. Therefore, the leakage of the pipeline is blocked to be within the standard allowable value.

In addition, as described above, the pressing portions 256a and 256b of the metal sheeting 250 are primarily pressed onto the seat surface 121 of the valve body 120 to block leakage within the standard tolerance, thereby preventing the metal sheeting 250. The elastic seat ring 300 installed between the crimping portions 256a and 256b of the) is secondarily pressed against the seat surface 121 of the valve body 120a to double the water leakage, thereby more completely than the standard tolerance. It will shut off the leak.

As described above, in the composite seat sealing apparatus of the two-contact metal seat and the elastic seat of the ball valve of the present invention, the crimping portions 256a and 256b of the metal seat ring 250 are closed when the valve body 120 is closed. The sheet surface 121 of 120 is first pressed strongly by the pressing force of the metal to the metal and the water leak is within a predetermined allowable value, thereby maintaining the required leakage preventing performance of the product, and furthermore, the elastic seat ring 300 Secondary compression on the seat surface 121 of the valve body 120 completely blocks the leak, and thus has much better performance than the required reference performance.

And the elastic sheet is used even after the valve is installed in the pipeline for a long time, even if the pressing force 256a, 256b of the metal seat ring 250 against the seat surface 121 of the valve body 120 becomes weak. The compressive force of the ring 300 acts as an auxiliary, so that the leakage blocking force better than the prescribed value is maintained for a long time.

In addition, when a long time has elapsed and the pressing force of the pressing parts 256a, 256b of the metal seat ring 250 and the elastic seat ring 300 falls below a prescribed value, the stepped end of the ball valve main body 100 The pressing portions 256a and 256b of the metal seat ring 250 are provided by the elastic force of the spring 270 inserted into the insertion groove 262 of the impact ring 260 in such a manner that one end thereof contacts the jaw portion 111g. And by adjusting the position of the elastic seat ring 300 can be obtained again the desired leakage blocking force, it is possible to maintain the leakage blocking performance for a very long time.

FIG. 6 is a cross-sectional view showing another embodiment in which a composite seat sealing device made of a two-contact metal seat and an elastic seat of a ball valve according to the present invention is applied to a ball valve. In the embodiment of FIG. O-ring (300 ') is forcibly fixed to the filling space 240 of the (), in this case, it is not necessary to fill the hardening agent 310 in the filling space 240.

And the other configuration and operation of this embodiment of Figure 6 is the same as the embodiment shown in Figures 1 to 5.

The present invention as described above, the valve body for opening and closing the pipeline to the valve body piped in the pipeline is blocked so that when the valve body is closed in the valve which is opened and closed by the rotation drive element so that the leakage amount is below the standard allowable value (regulated value) In the sealing device of a ball valve provided for the purpose, the metal seat ring is supported on the inner circumferential surface of the valve body by the seating support means so that the crimping portion of the metal seat ring is predetermined on the seat face of the valve body when the valve body is closed. The contact force at the pressure set so that the amount of leakage, that is, the leakage amount is equal to or less than the prescribed value, and the elastic seat ring is inserted into and fixed to the ring engaging groove formed in the metal seat ring, and is pressed by the seat surface of the valve body to assist the valve body. Pressing part of metal seat ring presses metal-to-metal primarily on seat surface of valve body at closing The pressure is tightly compressed so that the water leakage is within a predetermined allowable level, so that the required water leakage prevention performance of the product is maintained for a long time, and furthermore, the elastic seating is secondarily compressed to the seat surface of the valve body to completely block the water leakage. There is an advantage to provide a composite sealing device having a much better performance than performance.

Moreover, even if the pressing force of the crimping portion of the metal seat ring against the seat surface of the valve body is weakened after being used for a long time after the valve is installed in the pipeline, the pressing force of the elastic seating ring acts as an auxiliary function, so that the leakage blocking force better than the prescribed value for a long time There is an advantage to be maintained.

When a long time has elapsed and the pressing force of the metal sheeting ring and the elastic sheeting ring falls below a prescribed value, the elasticity of the spring acts on the metal sheeting via the contact ring and the pressing portion of the metal sheeting ring and the elastic Since the seating position is automatically adjusted, it also has the advantage of maintaining leakproof performance for a long time.

In addition, the metal sheeting ring is formed of an elastic material ring and the ring coupling groove into which the elastic sheeting is fitted, and the injection hole and the discharge hole, the elastic sheeting ring formed of an elastic material and the hardener filling groove is annular ring of the metal sheeting ring It is inserted into the coupling groove, and the liquid curing agent is injected into the filling space formed by the ring coupling groove of the metal sheeting ring and the curing agent filling groove of the elastic sheeting ring, and then the curing agent is hardened into a solid phase to fix the elastic sheeting. There is an advantage that the seat ring can be easily assembled and fixed very easily, there is an advantage that the elastic seat ring is very firmly fixed can maintain the leak-proof force for a long time stable.

Claims (7)

When the valve body 120 is closed in the valve which is opened and closed by a rotation driving element, the valve body 120 for opening and closing the pipe in the ball valve body 100 piped to the pipe line is such that the amount of leakage is less than the standard allowance. In the sealing device of the valve provided to shut off, when the metal seat ring 250 is supported by the seating support means 200 on the inner peripheral surface of the ball valve body 100 when the valve body 120 is closed The pressing portions 256a and 256b of the metal seat ring 250 contact the seat surface 121 of the valve body 120 at a predetermined pressing force, that is, a pressure set so that the amount of leakage is equal to or less than the prescribed value. An elastic seat ring 300 is inserted into and fixed to a ring coupling groove 251 formed in the metal seat ring 250 to assist in pressing the seat surface 121 of the valve body 120. In case of composite of two-contact metal sheet and elastic sheet Sealing device. According to claim 1, wherein the ring coupling groove 251 of the metal seat ring 250 is inserted into the elastic seat ring 300 with a hardener filling groove 301 is inserted into the ring coupling groove of the metal sheet ring 250 A space portion 240 for filling the hardener is formed in a sealed form by an inner surface and the hardener filling groove 301 of the elastic sheeting 300, and the filling portion is formed in the metal sheeting 250. A pair of through-holes 241 in communication with the 240 is formed in the upper and lower, the elastic sheeting 300 is the metal sheet by the curing agent 310 is filled and cured in the filling space 240 Composite seat sealing device consisting of a two-contact metal seat and an elastic seat of the ball valve, characterized in that fixed to the ring coupling groove 251 of the ring (250). The method of claim 2, wherein the elastic seat ring 300 is formed in a tapered shape having a curved surface, both inclined surface and the bottom surface in contact with the seat surface 121 of the valve body 120a which is the valve body 120 A portion in contact with the seat surface 121 of the valve body 120a is formed in a narrow and narrow shape toward the bottom surface, and the metal seat ring 250 has a seat portion 252 in the seat surface of the valve body 120a. It is formed to protrude slightly toward the (121) side, the ring coupling groove 251 and the pressing portion (256; 256a, 256b) is formed in the seat portion 252, and the ring coupling groove of the metal seat ring 250 251 is a composite sheet made of a two-contact metal sheet and elastic sheet of the ball valve, characterized in that formed in the cross section of the truncated triangular shape having an opening, both sides of the inclined surface and the bottom so that the elastic seat ring 300 is inserted Sealing device. According to claim 3, wherein the elastic sheeting 300 is formed so that the hardener filling groove 301 and the wing portion 303 is provided on both sides and the inner surface 302 of the hardener filling groove 301 is uneven surface The composite sheet sealing device made of a two-contact metal sheet and elastic sheet of the ball valve, characterized in that formed in the hardener filling groove 301 to be cured by curing the curing agent 310 is bonded to each other in a concave-convex form . The method of claim 1, wherein the seating support means 200 is formed in the stepped stepped portion 111e, 111f, 111g formed on the inner peripheral surface of the ball valve body 100 and the metal seat ring 250 and The impact ring 260 is inserted, and the contact portion 252 of the metal seat ring 250 is engaged to engage the stepped portion 261 of the impact ring 260, and an insertion groove formed in the impact ring 260 is inserted therein. A spring 270 for crimping the crimping portions 256a and 256b of the metal seat ring 250 to the seat surface 121 of the valve body 120 includes a stepped stepped portion 111g. Composite seat sealing device consisting of a two-contact metal seat and an elastic seat of a ball valve, characterized in that the one end is inserted in contact form. The tip end surface 263 of the stepped portion 111f of the ball valve body 100, the stepped portions 254a and 254b of the metal seat ring 250, and the contact ring 260. The sealing groove 255 is formed, and the O-ring 161 is inserted into the sealing groove 255, and the sealing groove 255 is formed to have a width larger than the diameter of the O-ring 161 to the O-ring. 161 is coupled to flow left and right from the inside of the sealing groove 255, between the stepped portion 111f of the ball valve body 100 and the stepped portion 254 of the metal seat ring 250 The ball valve is characterized in that the predetermined interval 174 is formed, the interval 175 is formed between the stepped portion 111g of the ball valve body 100 and the end of the contact ring 260 is formed. Composite sheet sealing device made of two-contact metal sheet and elastic sheet. 2. The two-contact metal seat of the ball valve according to claim 1, wherein the O-ring 300 'is inserted into the ring coupling groove 251 of the metal seat ring 250, and the O-ring 300' is inserted therein. Composite sheet sealing device made of elastic sheet.