KR100363022B1 - A Valve seat of ball valve - Google Patents

Abstract

The present invention relates to a valve seat of a ball valve, and more particularly, between the inner ring and the outer ring, forming a valve seat in contact with the opening / closing opening (ball) that opens and closes the flow path of the valve to maintain a seal. Is formed as an elastic connection portion, the inner ring is provided with elasticity to the inner ring in contact with the opening and closing the inner ring is in contact with the opening and closing, even if the contact surface of the inner ring in contact with the opening and closing, and the gap due to the processing error that is allowed during the processing of the opening and closing opening occurs It relates to a valve seat that is elastically contacted to maintain a complete seal.

The present invention is provided in close contact with the opening and closing port (5) in the flow path inside the valve body (4) by fastening with the screw portion 13 to the valve seat mounting portion (9) where the valve seat (6) is installed in the valve body (4) In the outer ring 10 having the female threaded portion formed on the outer circumference of the valve seat 6, the inner ring 11 is formed to be spaced apart in two stages so as to contact the opening and closing hole 5, and the inner ring 11 of the inner ring 11 is formed from the rear surface of the outer ring 10. In the valve seat 6 having the rear surface recessed inwardly, the outer ring 10 and the inner ring 11 have a thickness of 0.5 to 1.5 mm between the outer ring 10 and the inner ring 11 of the valve seat 6. It is characterized in that the elastic connecting portion 12 formed thinner than the integrally connected.

Description

Valve seat of ball valve {A Valve seat of ball valve}

The present invention relates to a valve seat of a ball valve, and more particularly, between the inner ring and the outer ring, forming a valve seat in contact with the opening / closing opening (ball) that opens and closes the flow path of the valve to maintain a seal. Is formed as an elastic connection portion, the inner ring is provided with elasticity to the inner ring in contact with the opening and closing the inner ring is in contact with the opening and closing, even if the contact surface of the inner ring in contact with the opening and closing, and the gap caused by the processing error that is allowed during processing of the opening and closing opening occurs It relates to a valve seat that is elastically contacted to maintain a complete seal.

In general, the ball valve 1 rotates the handle stem 2 as shown in FIG. 1 and the valve stem 3 rotates, and the opening and closing port 5 installed at the distal end of the valve stem 3 rotates together. While opening and closing the flow path inside the valve body 4, the valve seat 6 in close contact with the opening and closing port 5 is provided on both sides of the opening and closing port 5 on the flow path so as to prevent leakage of the fluid on the flow path. It is.

The opening and closing port 5 and the valve seat 6 are in intimate contact with each other while the opening and closing port 5 and the valve seat 6 are repeatedly rubbed when the opening and closing opening 5 is rotated to open and close the flow path. ) And the friction surface between the opening and closing port 5 is worn, and in the state where the flow path of the valve is closed, a large pressure is applied to the ball opening and closing hole 5 at the inlet opening 7 so that The valve seat 6 and the opening and closing port 5 are more closely adhered to each other, resulting in a phenomenon that the valve seat 6 on the outlet 8 side is easily worn.

As the valve seat 6 is worn as described above, a problem arises in that the opening / closing opening 5 in the valve does not control the fluid accurately and the fluid leaks. The part "a" in FIG. 1 shows a surface on which the valve seat 6 is worn.

The valve seat 6 used in such a conventional valve is generally formed in a rectangular cross section as shown in the enlarged excerpt of the main portion of FIG. 1, and is made of a softer material than the ball-shaped opening or closing hole 5. If the seat 6 is worn out, fluid leakage is natural. If the fluid leaks, the worn valve seat 6 is replaced. To replace the valve seat 6, the valve on the pipe line is closed and then the Since the valve seat 6 is removed by disassembling the valve and disassembling the valve, the replacement work is very cumbersome, and there is a problem that the work must be stopped.

The present invention forms a valve seat so that the valve seat in contact with the opening and closing in order to solve the above problems, even if the valve seat is worn and the gap caused by the processing error that is allowed during the processing of the opening and closing the ball form Of the valve seat and the valve seat can be elastically contacted to prevent leakage of fluid, and the valve seat can be greatly extended so that the valve can be used without replacing the valve seat until the valve life is reached. Let it be technical problem.

In order to solve the above technical problem, the present invention, the valve seat is installed in close contact with the opening and closing port in the flow path inside the valve body is installed in combination with the screw portion of the valve seat mounting portion in which the valve seat is installed in the valve body, An outer ring having a female threaded portion formed on an outer circumference thereof has an inner ring spaced apart in two stages so as to contact the opening and closing hole, and a rear surface of the inner ring is recessed inward from the rear surface of the outer ring. It is characterized in that the elastic connecting portion formed to be thinner than the outer ring and the inner ring with a thickness of ˜1.5 mm is integrally formed.

1 is a cross-sectional view showing a conventional ball valve.

2 is a cross-sectional view of a valve seat according to the present invention.

Figure 3 is a cross-sectional view of the ball valve is installed the present invention.

Figure 4 is an enlarged cross-sectional view showing the main portion extracted "A" in Figure 3. Figure 5 is an enlarged cross-sectional view showing a state in which the valve seat of the present invention is in close contact with the opening and closing process less processed within the processing error range. An enlarged cross-sectional view showing a state in which the valve seat of the present invention is in close contact with an opening / closing tool processed largely within the range.

<Explanation of symbols for main parts of drawing>

1 ball valve 2 handle 3 valve stem

4 valve body 5 opening and closing port 6 valve seat

7: inlet port 8: outlet port 9: valve seat mounting portion

10: outer ring 11: inner ring 12: elastic connection

13 thread part

Hereinafter, the valve seat of the ball valve according to the present invention will be described with reference to the accompanying drawings.

The valve seat 6 according to the present invention is installed in close contact with the opening and closing port 5 in the flow path inside the valve body 4 in which the ball-shaped opening and closing hole 5 is rotatably inserted to maintain airtightness in the valve body 4. It is used to

The valve body 4 is configured to be separated from the left and right as shown in Figure 3, the valve body 4 is separated from the left and right are coupled as a bolt, the flow path is formed horizontally inside the combined valve body (4) And a spherical space in which a ball-shaped opening and closing hole 5 is inserted and rotated is formed in the inner central portion, and a valve seat is installed at an inner circumference of a tangential part connected to the inlet 7 and the outlet 8 on both sides of the spherical space. The part 9 is formed, and the valve seat 6 is installed in both valve seat installation parts 9, respectively.

The valve seat 6 is formed such that the outer ring 10 installed in the valve seat mounting portion 9 inside the valve body 4 and the inner ring 11 contacting the opening and closing hole 5 are spaced apart in two stages. The outer ring 10 and the inner ring 11 are connected as an elastic connecting portion 12 having a thickness thinner than the outer ring 10 and the inner ring 11 so that the outer ring 10, the inner ring 11, and the elastic connecting part 12 are integrally formed. It is.

In addition, the elastic connection portion 12 is 0.5 to 1.5mm in thickness is formed thin so that the elasticity can act between the outer ring 10 and the inner ring 11, the rear of the outer ring 10 of the inner ring 11 The rear surface is formed to be recessed inward.

For reference, the valve seat 6 of the present invention is formed of a metal material, the outer ring 10 is fixed to the valve seat mounting portion 9 and the inner ring is in a free state in contact with the opening and closing port between the outer ring 10 and the inner ring 11 Elasticity is given to the inner ring 11 by the elastic connecting portion 12 to connect the.

In addition, a threaded portion 13 is formed on the outer circumference of the outer ring 10, and the threaded portion 13 is fastened to the inner circumference of the valve seat mounting portion 9 corresponding to the threaded portion 13 of the outer ring 10. Female thread is formed.

In addition, the depth b in which the inner ring 11 is recessed to a predetermined depth inside the outer ring 10 varies depending on the size of the valve seat 6, but the outer diameter of the valve seat 6 is 30 to 120 mm in size. In the case of, it is preferable to form 0.3 to 1.0 mm.

In the valve seat 6 of the present invention, the inner ring 11 is formed to be recessed to a predetermined depth inside the outer ring 10, as shown in FIG. 4, by pressing the front surface of the inner ring 11 to the opening and closing hole 5. Leave a space to push back.

If described with reference to Figures 2 to 6 the assembly and operation of the present invention configured as described above.

First, the valve seat 6 is screwed to the valve seat mounting portion 9 of the valve body 4 separated from side to side, and the spherical opening and closing hole 5 formed at the lower end of the valve stem 3 is fixedly installed. Next, the valve main body 4, which is separated from the left and right, is aligned with each other, and the bolt main body 4 is coupled to the flange coupling part of the left and right valve main bodies 4 to engage the valve main body 4, which has been separated from the left and right.

When the valve body 4 is coupled as a bolt as described above, the valve body 4 separated from the left and right by the strong tightening force of the bolt is coupled, as well as both sides of the spherical opening and closing port 5 are formed on both sides of the valve seat 6 The inner ring 11 is strongly pushed toward the outer ring 10 while being strongly in contact with the inner ring 11, and at the same time, an elastic connection part integrally formed with the inner ring 11 is formed in the front circumference of the opening and closing hole 5. By the elasticity of (12), the inner ring 10 is pushed to both sides of the opening and closing port (5).

Since the inner ring 11 is pushed in such a state that the rear surface of the inner ring 11 enters inward from the rear surface of the outer ring 10, the inner ring 11 is elastic with the opening and closing hole 5 while being pushed within the range of the depth b of FIG. 2. Will be in contact.

As described above, when the handle 2 is turned to open and close the valve while the inner ring 11 of the valve seat 6 is elastically in contact with both sides of the opening and closing port 5, the handle ( 2) the valve stem 3 installed is rotated, and the ball-shaped opening / closing hole 5 installed at the lower end of the valve stem 3 also rotates in the same manner as the valve stem 3 to open and close the flow path in the valve body 4. do.

As described above, when the ball-shaped opening / closing opening 5 rotates, the outer surface (spherical surface) of the opening / closing opening 5 is in contact with the front surface of the inner ring 11 that is elastically contacted, and thus the bar is completely maintained. The flow path can be opened and closed as described above, and the valve seat made of a material softer than the opening and closing hole 5 and the opening and closing hole 5 which are in contact with the inner ring 11 when the valve is used for a long time by such elastic and strong adhesion ( The contact surface of the inner ring 11 of 6) is to be worn.

However, although the opening and closing hole 5 and the inner ring 11 which are in contact with the inner ring 11 are worn as described above, an elastic connection part which is formed in a thin thickness between the outer ring 10 and the inner ring 11 and is integrally formed ( 12, the inner ring 11 is in elastic contact with the opening and closing opening 5, the outer spherical surface of the opening and closing opening 5 formed in the form of a ball and the front surface of the inner ring 11 is in close contact with each other to enable continuous sealing. In addition, the ball-shaped opening or closing opening 5 inserted into the valve body 4 has a machining error with respect to the roundness of the circumferential surface of the opening and closing opening 5 at a maximum of ± 1.5 / 100 mm. When using the valve seat known in Japanese Patent Application Laid-open No. Hei 8-247306 (published 199.27.27) when the opening / closing opening 5 having an error of ± 1.5 / 100 mm is installed in the valve body 4 and then used, Thickness is uniform and elastic force is extremely small. When the high pressure of the fluid acts, the leakage of the fluid generated by the gap of the processing error as described above can not be blocked, but the valve seat according to the present invention has a processing error as shown in FIG. The elastic connecting portion 12 having a thickness thinner than that of the inner and outer rings 11 and 10 formed integrally with the outer ring 10 in a state of being assembled and processed less than a dotted line within the range (part shown by a solid line). Since the inner ring 11 and the outer ring 10 are separated by C, and the inner ring 11 is in close contact with the opening and closing hole 5, there is no gap, so that the fluid does not leak even if the high pressure fluid flows inside the valve. In addition, as shown in FIG. 6, when the opening and closing opening 5 is processed and assembled (shown by a solid line) larger than the dotted line within the processing error range, it is formed integrally with the outer ring 10. The elastic connection portion 12 having a thickness thinner than that of the outer ring 11 and 10 is crushed, and the inner ring 11 is opened and closed as the gap between the inner ring 11 and the outer ring 10 decreases to less than C '. ), The fluid does not leak even if the high pressure fluid flows inside the valve, so that the fluid does not leak due to the gap caused by the processing error that is allowed during the opening and closing of the opening 5. The present invention is to complete the sealing function of the valve seat because the inner ring 11 is accurately contacted and closed according to the outer circumferential surface of the opening and closing port 5 by the elasticity of the elastic connection portion 12 of the valve seat (6).

As described above, the valve seat of the ball valve of the present invention, the inner ring of the valve seat which is in contact with the opening and closing hole formed in the ball shape is formed so that a strong elasticity can be acted by the elastic connection portion, the continuous frictional contact between the opening and closing opening and the inner ring The contact between the opening and closing of the valve seat and the inner ring of the valve seat is caused by the elastic connection of the inner ring and the outer ring integrally formed between the inner and outer rings, despite the wear of the surface contacting the opening and closing opening and the clearance caused by the processing error allowed during the machining of the opening and closing opening. This elasticity makes it possible to have a perfect seal.

As the contact between the opening and closing port and the inner ring of the valve seat is made elastic, so that the perfect sealing is possible, the life of the valve seat is greatly extended, thereby preventing the inconvenience and loss of workability due to the replacement of the valve seat as in the prior art. It is.

Claims (2)

( delete ) (정정) Fastening with the screw part (13) to the valve seat mounting portion (9) in which the valve seat (6) is installed in the valve body (4) in close contact with the opening and closing port (5) in the flow path inside the valve body (4). Inner ring (11) is formed in the outer ring 10 is formed on the outer circumference of the valve seat 6, the inner ring 11 is spaced apart in two stages so as to contact the opening and closing port 5, the inner ring 11 than the rear of the outer ring (10) In the valve seat 6, which is formed such that the rear surface of the recess is inward, Between the outer ring 10 and the inner ring 11 of the valve seat 6, the elastic connection portion 12 formed thinner than the outer ring 10 and the inner ring 11 to a thickness of 0.5 to 1.5mm is integrally formed The valve seat of the ball valve characterized in that.