KR20030002607A - Pipe Forming Full Bore Ball Valve and Fabricating Method therefor - Google Patents

Abstract

PURPOSE: A pipe-forming full bore ball valve and the manufacturing method is provided to shorten a manufacturing process, cut down the manufacturing cost, and improve productivity. CONSTITUTION: A pipe-forming full bore ball valve comprises an intermediate body unit(21) having a neck unit(10), a ball(30) coupled to a stem(11) of the neck unit, right and left airtight units(40), a right and left pipe(50), and right and left body units(22,23). The right and left airtight units are each equipped with a seat ring(41) contacting with the spherical surface of the ball and end pieces(45) supporting the seat ring, and the airtight unit seals the connection portion between the ball and the right and left pipe. The right pipe and left pipe are each coupled to the end piece and welded to the outer end portion of the right and left body unit. Ends of the right body unit and the left body unit are each welded to the end portion of the intermediate body unit, and the other end portion is welded to a predetermined position of the right and left pipe.

Description

Pipe Forming Full Bore Ball Valve and Fabricating Method therefor}

The present invention relates to a ball valve for adjusting the flow rate of the fluid flowing in the pipe pipe by receiving the ball formed in the passage hole in the body and connected to the pipe pipe, in particular the pipe pipe through the end piece to the ball It is possible to manufacture by pipe molding, by dividing the body into the middle body part directly connected to the ball and the left and right body parts to which the pipe pipes are connected so as to be directly connected, thereby reducing the manufacturing process and manufacturing cost, and also the end Since there is no need to assemble the connecting pipe between the piece and the pipe pipe, the radioactivity test (RT) process due to welding is omitted, and thus, a pipe-formed full bore ball valve and a manufacturing method for improving productivity by greatly reducing cost.

The ball valve is assembled to the neck while the ball-shaped disk and the spherical surface of the ring-shaped valve seat fitted to the valve body are assembled to the neck while maintaining airtightness. An apparatus for controlling the flow of fluid by a mounted handle, the member being installed at the nodal position of the pipeline.

The ball valve installed in this way rotates an externally mounted handle so that the ball connected to the coupling shaft of the handle rotates to adjust the size of the flow path hole, thereby closing or opening the fluid passage in the pipe pipe and The amount of fluid flowing is controlled.

1 is a cross-sectional view showing the configuration of a conventional full bore ball valve.

The conventional ball valve is accommodated in the body and the body (4) welded to the neck portion (1) consisting of the stem (2) and the neck (3) and the connecting portion of the neck (1) of the neck (1) A ball 5 axially coupled to the stem 2 of the neck portion 1, an end piece 9 in which the seat ring 6, the O-ring 7, the cup spring 8, and the like are assembled, and the end piece. It is composed of a connecting pipe (P) welded and assembled at the end of (9), as will be described later, the ball (5) is formed in step by step and the flow path hole is formed in accordance with the operation of the handle to rotate the connection pipe (P) By opening and closing the fluid passage, it is possible to control the amount of fluid flowing in the piping pipe.

A process for assembling a conventional full bore ball valve having such a configuration is shown in FIGS. 2A-2F and FIG. 3.

Neck part (1) consisting of stem (2), neck (3) and the like, and body (4) assembled by welding the edge connecting part on the neck (3) end of neck part, and engaging with stem (2) of neck part The ball 5 is formed, and the ball 5 having a flow path hole penetrating both the left and right sides, the seat ring 6, the O-ring 7, the cup spring 8 are assembled and connected between the balls 5 to be airtight. While maintaining the end pipe 9 is connected to the connection pipe (P) is processed and assembled in a separate machining process and assembly process is prepared in advance.

After the structural members are prepared in this way, as shown in FIG. 2A, the stem 2 of the neck portion 1 is inserted into the hole formed in the upper center portion in the body 4 to weld the connecting portion between the stem and the body. Assemble (1) and body (4).

2B, the neck part is received in the hole of the ball 5 by accommodating the ball 5 into the body 4 while the neck part 1 and the body 4 are welded and assembled. After the stem 2 of (1) is combined and axially assembled to form an integrated assembly, as shown in FIG. 2C, the end pieces of the left and right outer peripheral surfaces of the body 4 are closed inward by bending. It is molded so as to contact the outer periphery of (9).

As shown in FIG. 2D, the portion where the end piece 9 and the ball 5 contact each other is assembled with the seat ring 6, the O-ring 7 and the cup springs 8 for the airtight end piece 9. 2E, the end piece 9 is brought into close contact with the communication portion of the ball 5 so that the outer peripheral edge of the end piece closely matches the edge of the communication portion of the ball as shown in FIG. 2E. In the left and right edges of the body (4) and the contact portion of the end piece (9) are welded, respectively, to assemble into an integral structure.

2f, the connecting pipe P is connected to the end piece 9 welded integrally with the body 4, and welded along the outer circumferential surface of the connecting portion to assemble the integrated structure.

Such a conventional full bore ball valve may use a diameter of the ball 5 which is the same as or larger than that of the connection pipe P, so that the resistance of the fluid passing through the valve is low. Since the connecting pipe (P) cannot be connected directly to the end, the end piece (9) made of cast steel is connected to the ball, and the end of the body (4) is bent to this end piece by bending to make contact with it. Was to be welded and assembled by connecting connecting pipes to the cut edges of the end pieces.

That is, a seat ring 6 made of Teflon and an end piece 9 made of cast steel is required to maintain airtightness between the ball 5 and the connecting pipe P. Since the diameter is larger than the diameter of the connecting pipe (P), the ball (5) and the connecting pipe (P) can not be directly connected, the end of the end piece was cut to match the diameter and had to assemble.

However, as shown in FIG. 2C, the molding process of pinching the left and right ends of the body 4 has a limit depending on the stretching force of the metal material constituting the body 4. There is a problem that the body 4 is vulnerable.

Therefore, in order to prevent such a problem, as shown in Figs. 1 and 2D, since the end piece 9 made of cast steel having a large cross-sectional thickness and a relatively long length L ₁ is used, the thickness is increased. The use of a thick end piece allows welding of the body 4 and the end piece 9 without retracting the left and right ends of the body 4, but the cost is high, the weight is heavy, and There is a problem that the machining operation is difficult because the bending process must be performed in the assembled state.

In addition, as shown in Fig. 2F, the end piece 9 connecting the body 4 and the ball 5 uses a special tube made of cast steel having a relatively large cross-sectional thickness and a relatively long length. Since the outer diameter of the connecting pipe and the outer diameter of the end piece 9 must be matched for welding with the small connecting pipe P, the connecting portion (the area portion indicated by A in Fig. 1) of the edge of the end piece 9 must be made. The cutting operation must be made beforehand.

In addition, the welding of the connecting portion must be made to a certain quality or higher to withstand the pressure of the fluid flowing in the tube at the connecting portion between the end piece (9) and the connecting pipe (P). This is followed by a cumbersome task of conducting a radioactivity test (RT) process along the edge of its outer circumference.

Since the conventional full bore ball valve is connected between the ball and the connecting pipe by using an end piece made of thick steel and relatively long cast steel, it causes a cost increase and also for welding with the connecting pipe. Since the cutting process is required for the end of the end piece, there is a problem in that productivity decreases due to a decrease in manufacturing efficiency and a long manufacturing time.

In addition, in welding the connection portion connecting the end piece and the connection pipe, not only a highly skilled welding technique is required, but also by a separate radioactive test (RT) of the welded portion to ensure the quality of the product after welding. Confirmation work follows, but the film required for the radioactivity test (RT) is expensive and cumbersome inspection work has an inefficient problem that causes a cost increase factor.

In addition, due to the valve structure, the existing medium and large valves have no choice but to manufacture end pieces connected to the body part using cast steel products, which not only increases the production period, but also requires a high production cost.

Therefore, the present inventors have developed a manufacturing technique of a ball valve by pipe forming, which is low in material cost, simple in fabrication and assembly, and large in mass production, thereby improving productivity.

An object of the present invention is to divide the body portion into the left and right body portion to which the ball and the pipe pipe is assembled, respectively, the body is assembled by welding the assembly of the left and right body portion, respectively from both sides of the assembly of the intermediate body pipe pipe endpiece It is possible to provide a pipe-formed full bore ball valve and a method of manufacturing the same by directly connecting to the ball through the pipe forming to be manufactured by reducing the manufacturing process and manufacturing cost to improve productivity.

Another object of the present invention is that as the pipe pipe is directly assembled to the end piece, there is no need to assemble the connection pipe between the end piece and the pipe pipe, and thus no welding work is required for the connection between the end piece and the pipe pipe. The radioactivity test (RT) process is also omitted, thereby providing a pipe-formed full bore ball valve and a method of manufacturing the same which greatly reduce the cost.

Still another object of the present invention is to provide a pipe-formed full bore ball valve and a method of manufacturing the same, which are easy to assemble and shorten the manufacturing time by separately assembling the assembly of the intermediate body and the assembly of the left and right body parts. It is.

1 is a longitudinal sectional view showing the structure of a conventional full bore ball valve;

Figure 2a to 2f is a view showing the step of assembling the conventional full bore ball valve,

Figure 3 is a process diagram showing the overall assembly process of a conventional full bore ball valve,

4 is a longitudinal sectional view showing the configuration of a pipe-formed full bore ball valve of the present invention;

5 is an exploded perspective view showing an exploded configuration of the airtight portion of the present invention;

6a to 6e is a step-by-step view showing the assembly process of the pipe-formed full bore ball valve of the present invention;

7 is a process chart showing the overall assembly process of the pipe-formed full bore ball valve of the present invention.

<Description of Symbols for Major Parts of Drawings>

10: Neck 11: Axis 12: stem

20: body 21: middle body 22, 23: left, right body

30: Ball 31: Hole 32: Euro hole

40: confidential 41: sheeting 42: first O-ring

43: support ring 44: cup spring 45: end piece

46: second O-ring 50: piping pipe

The technical configuration of the pipe-formed full bore ball valve of the present invention and its manufacturing method will be described with reference to the accompanying drawings.

4 is a longitudinal sectional view showing the configuration of the pipe-formed full bore ball valve of the present invention.

As shown, the intermediate body portion 21, the neck portion 10 is assembled; A ball (30) coupled to the stem (11) of the neck portion (10); A seat ring 41 in contact with the spherical surface of the ball 30 and an end piece 45 for supporting the seat ring 41 are provided, respectively, between the ball 30 and the left and right piping pipes 50. A left and right hermetic portion 40 for hermetically connecting parts thereof; Left and right piping pipes 50 coupled to the end pieces 45 and welded to outer ends of the left and right body parts 22 and 23, respectively; The left and right piping pipes 50 and one end thereof are respectively welded and the other end is composed of left and right body parts 22 and 23 which are respectively welded to the intermediate body portion 21. It is possible to manufacture by pipe molding by assembling directly connected to the ball through to reduce the manufacturing process and manufacturing cost, and also do not need to assemble the connecting pipe between the end piece and the pipe pipe radiation test (RT) by welding Since the process is omitted, the cost is greatly reduced, thereby improving productivity.

In addition, the airtight portion 40 is in contact with the left and right spherical surface of the ball 30 and the seat ring 41 to prevent leakage of the fluid; End pieces 45 for supporting the seat rings 41, respectively; First o-rings 42 respectively inserted between the seat rings 41 and the end pieces 45 to maintain airtightness; A cup spring 44 providing elasticity to each seat ring 41 between the seat ring 41 and the end piece 45; And a second O-ring 46 fitted between the end piece 45 and the left and right piping pipes 50 to maintain airtightness.

The present invention having the characteristics as described above has been forced to manufacture the end piece connected to the body portion of the existing medium and large valves in the cast steel, the present invention is a small valve, as well as the body of the medium and large valves It can be manufactured from pipe material, which shortens the manufacturing process and reduces the cost.

On the other hand, the process which shows the manufacturing method of the pipe shaping | molded full bore ball valve of this invention is shown to FIG. 6A-6E and FIG.

As shown in the drawing, the stem 11 of the neck portion 10 is drilled into the intermediate body portion 21 to engage the stem 11 of the neck portion 10 with the hole to connect the neck portion 10 and the intermediate body portion 21. Assembling; The ball 30 and the stem 11 of the neck portion 10 are inserted into the intermediate body portion 21 by putting the ball 30 in the assembled state of the neck portion 10 and the middle body portion 21. Making a step; Assembling the left and right airtight parts 40 with the seat ring 41 and the end piece 45, and coupling the left and right airtight parts 40 and the left and right piping pipes 50; Welding the left and right piping pipes 50 to the left and right body portions 22 and 23, respectively; Welding the left and right body parts 22 and 23 to which the middle body part 21 to which the ball 30 and the neck part 10 are coupled and the left and right piping pipes 50 are welded, respectively; Since the pipe pipe 50 is directly connected to the end piece 45, there is no need to assemble the connection pipe between the end piece and the pipe pipe, and thus no welding work between the end piece and the pipe pipe is necessary. Radioactivity test (RT) process due to welding is also omitted, so that the cost is greatly reduced.

In addition, the process of coupling the ball 30 to the intermediate body portion 21, and the process of welding the left and right body portion 22, 23 by combining the airtight portion 40 and the pipe pipe 50, respectively. Is characterized in that it is made in parallel.

In addition, the coupling between the airtight portion 40 and the pipe pipe 50 is characterized in that the coupling through the second O-ring 46, respectively.

In addition, when welding the intermediate body portion 21 and the left and right body portion 22, 23 is characterized in that the welding portion is determined so that the airtight portion 40 is in close contact with the ball (30).

The structure of the pipe-formed full bore ball valve and its manufacturing method which consist of the above characteristics are demonstrated concretely.

4 is a longitudinal sectional view of a pipe-formed full bore ball valve of the present invention.

The neck portion 10 is a member forming a neck and a stem to the lower side, and is connected by welding the edge of the hole of the intermediate body portion 21 in contact with the neck, the ball 30 is assembled to the stem is assembled Although not shown, it is connected to the adapter and the handle to the upper side.

The body portion 20 is a structure that functions as a cover to protect from the outside while supporting them between the ball and neck portion, the connection between the ball and the pipe pipe, the intermediate body portion 21 and the left and right body portion ( It is a member which is divided into 22 and 23, and is manufactured beforehand.

The intermediate body portion 21 uses a steel tube whose diameter is sufficiently larger than the diameter of the ball 30 (the material of the tube uses a variety of stainless steel, special alloy steel, etc., depending on the purpose of the valve), the hole in the middle It is drilled so that the stem 11 and the neck portion 10 surrounding and protecting the stem are coupled.

The left and right body parts 22 and 23 use a pipe having the same thickness and diameter as the middle body part 21, and one end thereof is preliminarily bent by bending to closely adhere to the outer diameter of the pipe pipe 50. Molded.

The ball 30 forms a hole 31 coupled to the stem 11 of the neck portion 10 at an upper end thereof, and a flow path hole 32 having the same diameter as the inner diameter of the pipe pipe 50 passing through the left and right sides. As one member, the ball is rotated by the operation of an external handle (not shown) provided on the upper part of the neck portion to adjust the amount of fluid flowing in the pipe pipe by adjusting the size of the flow path hole.

As shown in FIG. 5, the airtight portion 40 maintains airtightness between the left and right connecting portions of the ball 30 and the piping pipe 50 to prevent leakage of fluid, and the airtight portion 40 is a ball. A seat ring 41 in close contact with the spherical surface 30 to prevent leakage of the fluid; An end piece (45) for supporting the seat ring (41); A first O-ring (42) inserted between the end piece (45) and the pipe pipe (50) to maintain airtightness; A cup spring 44 which provides elasticity to the seat ring 41 via a support ring 43 between the seat ring 41 and the end piece 45; It is composed of a second O-ring 46 is inserted between the seat ring 41 and the end piece 45 to maintain the airtight.

The left and right piping pipes 50 are fluid flow passages, and are coupled to the end pieces 45 of the left and right airtight portions 40, respectively, and the second o-ring 46 is inserted between the coupling portions to leak the fluid. This prevents the joining from coming off easily.

6A to 6E show a process diagram showing a method for manufacturing a pipe-formed full bore ball valve of the present invention.

Forming process of the ball 30, assembly process of the neck portion 10 for connecting the ball 30 with the support and handle, machining process of the intermediate body portion 21 to which the neck portion 10 is coupled and left and right body The machining process of the parts 22 and 23 is made in advance and prepared.

First, as shown in Fig. 6A, a hole is drilled in the intermediate body portion 21 to weld the stem 11 and the neck 12 into the hole, and the stem 11 and the support in the neck 12 are supported. Assemble the parts to assemble the neck portion 10 and the stem 11 to the intermediate body portion (21).

Thereafter, as shown in FIG. 6B, the neck 30 and the stem 11 are assembled to the intermediate body 21 to accommodate the ball 30 into the intermediate body 21. 30) and the stem 11 are assembled.

As shown in Fig. 6C, an airtight portion 40 composed of a seat ring 41, a first O-ring 42, a support ring 43, a cup spring 44, and an end piece 45 is assembled and hermetically sealed. Through the second O-ring 46 is coupled between the portion 40 and the left and right piping pipes 50, the assembly of the airtight portion 40 and the piping pipe 50 is assembled to the left and right body portions 22 and 23. One end portion accommodated in the pre-bending process is welded at a predetermined position on the outer surface of the pipe pipe to join the assemblies of the left and right body parts 22 and 23.

Here, the process of combining the airtight portion 40 composed of the seat ring 41 and the end piece 45 and the left and right piping pipe 50, and the left and right piping pipe 50 to the left and right body parts ( The process of welding to 22 and 23 can be performed in parallel with the said process, and the technical idea of this invention does not change with the after process.

On the other hand, since the end piece 45 used in the present invention has a short length (L ₂ ) enough to support the seat ring 41, the end piece 45 is light and easy to handle, such as assembling and conveying, and the end piece 45 By fitting the second O-ring 46 between the pipe and the pipe 50, the welding between the end piece and the pipe pipe becomes unnecessary, so that the radioactivity test (RT) is not necessary.

Thereafter, as shown in FIG. 6D, the assembly in which the left and right airtight portions 40 and the left and right piping pipes 50 are welded to the left and right body portions 22 and 23, respectively, is provided with the ball 30 and the neck portion 10. Is connected to the left and right sides of the assembly of the intermediate body portion 21 is coupled, the intermediate body portion 21 and the left and right body portions 22 and 23 are assembled together as an integral assembly by welding between the contact portions that are in contact with each other; When the left and right body parts 22 and 23 are welded to the intermediate body part 21, the seat ring 41 of the airtight part 40 is welded to a predetermined position so as to be in close contact with the ball 30. .

The overall assembly state of the ball valve manufactured by the above process is shown in Fig. 6E.

Meanwhile, in the conventional ball valve, the body and the connecting pipe are manufactured by pipe forming, and the end piece assembled between the ball and the connecting pipe is made of cast steel, so the connection part between the ball and the end piece, the end piece and the pipe Although there were problems according to the prior art according to the assembling work at the connection part on the pipe, in the present invention, since the pipe pipe is directly connected to the ball through the short end piece, the connection pipe is unnecessary, and the body part of the ball valve and the pipe It is noted that the pipes are made by pipe forming and can be easily assembled and connected.

That is, the conventional ball valve is formed by connecting the end pieces of the long length cast steel products to the ball and the body part with one body part, and connecting the pipe pipes at the ends of the assembled end pieces. Due to the large gap between the part and the end piece, the body part cannot be molded as much as the gap. Therefore, the end piece connected to the body part has a large diameter to use the cast steel product. I came.

However, according to the present invention, the assembly of the pipe and the intermediate body is assembled by assembling a pipe pipe having the body parts separated into three and the pipe pipes having the short length end pieces respectively assembled at their ends. Since it is manufactured as it is possible to manufacture by pipe molding, because the end piece of the cast steel product having a large length and a large diameter as in the prior art is possible, the assembly work is made easy.

Therefore, the present invention has the advantage that it is possible to manufacture not only small products but also medium and large standard products by pipe molding through the manufacturing process of the ball valve by pipe molding as described above.

The present invention is configured and manufactured as described above is divided into a body portion, the left body and the right body portion, the ball pipe is assembled, the body is assembled, respectively, by assembling each of the assembly of the left and right body portion from both sides of the assembly of the intermediate body portion Since the pipe pipe is directly connected to the ball through the end piece, the pipe can be manufactured by pipe forming, thereby reducing the manufacturing process and manufacturing cost, thereby improving productivity.

Further, in contrast to the conventional technique in which the joint of the end piece and the connecting pipe is welded and the radioactivity test (RT) is performed on the weld part, the present invention combines the end piece and the pipe, By assembling the coupling parts inside the body and assembled together, there is no need for welding the joints, so there is no need for a radioactivity test (RT) process, thereby reducing the cost.

In addition, the size of the end piece is reduced to save cost, and the process of cutting the edge of the end piece connected to the pipe pipe can be omitted, and the assembly of the middle body part and the left and right body parts are separately assembled. This facilitates assembly and has an effect of shortening the production time.

In addition, unlike the conventional medium and large valves had to manufacture the body portion and the end piece of the cast steel product due to the valve structure, the present invention enables the production of medium and large valves made of pipe material, shortening the manufacturing process and reducing the cost This is a useful invention possible.

Claims (6)

An intermediate body portion 21 to which the neck portion 10 is assembled; A ball (30) coupled to the stem (11) of the neck portion (10); A seat ring 41 in contact with the spherical surface of the ball 30 and an end piece 45 for supporting the seat ring 41 are respectively provided between the ball 30 and the left and right piping pipes 50. A left and right hermetic portion 40 for hermetically connecting parts thereof; Left and right piping pipes 50 coupled to the end pieces 45 and welded to outer ends of the left and right body parts 22 and 23, respectively; One end is welded to the end of the intermediate body portion 21, the other end is left and right body parts 22, 23 are welded and assembled at a predetermined position of the left and right pipe pipes 50, respectively; A pipe-formed full bore ball valve. According to claim 1, The airtight portion (40) is in close contact with the left and right of the spherical surface of the ball 30 and the seat ring (41) to prevent leakage of the fluid; End pieces 45 for supporting the seat rings 41, respectively; First o-rings 42 respectively inserted between the seat rings 41 and the end pieces 45 to maintain airtightness; A cup spring 44 providing elasticity to each seat ring 41 between the seat ring 41 and the end piece 45; And a second O-ring (46) inserted between the end piece (45) and the left and right piping pipes (50), respectively, to maintain airtightness. Assembling the neck portion (10) and the intermediate body portion (21) by drilling a hole into which the stem (11) enters the intermediate body portion (21) and joining the stem (11) of the neck portion (10) to the hole; The ball 30 and the stem 11 of the neck portion 10 are inserted into the intermediate body portion 21 by putting the ball 30 in the assembled state of the neck portion 10 and the middle body portion 21. Making a step; Assembling the left and right airtight parts 40 with the seat ring 41 and the end piece 45, and coupling the left and right airtight parts 40 and the left and right piping pipes 50; Welding the left and right piping pipes 50 to the left and right body portions 22 and 23, respectively; Welding the left and right body parts 22 and 23 to which the middle body part 21 to which the ball 30 and the neck part 10 are coupled and the left and right piping pipes 50 are welded, respectively; Method for producing a pipe-formed full bore ball valve, characterized in that the configuration. The method of claim 3, wherein the process of coupling the ball 30 to the intermediate body portion 21, and the airtight portion 40 and the pipe pipe 50 by combining the left and right body portion (22, 23) The welding process is a method for producing a pipe-formed full bore ball valve, characterized in that the parallel processing. 4. The method according to claim 3, wherein the connection between the airtight portion (40) and the pipe pipe (50) is coupled to each other via a second O-ring (46). According to claim 3, When welding the intermediate body portion 21 and the left and right body portion 22, 23 characterized in that the welding portion is determined so that the airtight portion 40 is in close contact with the ball (30) Method for manufacturing pipe-formed full bore ball valve.