JPH0125811Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a butterfly valve used for opening/closing fluid, controlling flow rate, etc., and particularly relates to a valve body.

(Prior Art) Generally, a butterfly valve is a general-purpose valve mainly used for opening and closing pipelines through which water flows.
As is well known, the basic structure of a conventional butterfly valve, as shown in FIGS. 6A to 6C and FIG. 7, includes a hollow cylindrical valve body 1 made of a rigid material;
A disc-shaped valve plate 2 also made of a rigid material is rotatably supported within the valve body 1, and a Annular seat ring 3 made of elastic material such as sulfur rubber
When the butterfly valve is closed, the peripheral edge of the valve plate 2 is brought into pressure contact with the inner peripheral surface of the annular seat ring 3 to perform a sealing action.

When installing a butterfly valve as described above in a pipeline, if the butterfly valve is not aligned with the core of the pipeline (horizontal line in the drawing), the peripheral edge of the valve plate 2 may come into contact with the inner surface of the pipe. Therefore, the valve plate 2 cannot freely rotate. Furthermore, if the end 3a of the annular seat ring 3 is not evenly joined to the plane of the pipe flange, external leakage may occur. For these reasons, centering during piping of a butterfly valve plays an important role in determining its function.

On the other hand, as shown in the recent trend of butterfly valves being light, thin, short and small, the dimension between the two end faces of the valve body (dimension between the faces) is extremely narrow, commonly known as a wafer shape, which also facilitates piping. Therefore, as shown in the drawing, there is a valve body 1 near the top and bottom of the valve body.
Boss portions 5a and 5b having piping bolt holes 4 were formed with a thickness narrower than the face-to-face dimension a. 6A to 6C show the case where the boss portion 4a is made thinner, and FIG. 7 shows the case where the boss portion 5b is made thicker.Both of these boss portions are provided with piping bolt holes 4. It is set up.

(Problems to be solved by the invention) As shown in FIG. However, as shown in FIG. 9, as a valve used at the end of a pipe, that is, an end valve, one pipe flange 6 and the valve body 1 Since there is an open space between the bolt and the boss portion 5a, there is a drawback that it cannot be firmly held with some bolts.

In piping work using butterfly valves, the first
If all the piping work including the pump P and strainer S as shown in Figure 1 is not completed, that is, if it is left in the condition of A block shown by the broken line for a certain period of time, the end of the pipe may become more harmful. There is a risk of dust entering. However, in the case of B block, there is a butterfly valve v at the end of each pipe, so by keeping these valves closed, there is no risk like the above, but in the case of B block, too. However, it is not possible to remove the butterfly valve v at the end when performing expansion work at the appropriate time. This is because if it is removed, fluid will flow out. This means that
The same applies to the case where a blind flange 9 as shown in FIG. 10 is attached to the end of the pipe.

When installing a butterfly valve at the end of a pipe as described above, in order to eliminate the above-mentioned inconvenience as shown in Fig. 9, a companion flange (meaning the mating flange, shown in Fig. 8) is attached to the other open end face. It is possible to attach the valve body to the end of the pipe by tightening long bolts so that the valve body 1 is sandwiched between the pipe flange 6 and the pipe flange 6. For the reason mentioned above, it is not possible to remove only the flange attached to the other end of the valve body, so it is necessary to insert the pipe into the other flange with the butterfly valve attached to the end of the pipe and weld it to the flange. However, the above-mentioned work is absolutely unacceptable, especially for butterfly valves made of elastic materials, as their functionality is degraded by welding heat. As described above, conventional butterfly valves have had various problems.

The technical problem of the present invention is to solve the problems of the prior art described above and create a boss structure that can be easily connected to a pipe not only in the middle of the pipe but also at its end.

(Means for Solving the Problems) In order to solve the above-mentioned technical problems, the present invention provides piping bolt holes that are drilled near the top and bottom of the hollow cylindrical valve body of the butterfly valve. The valve body is characterized in that a thinner boss portion is provided on either side of the end face of the valve body.

(Function) In the present invention, as described above, the boss part, which has piping bolt holes and is made thinner, is offset to one side of the end face of the valve body, so that the pipe flange and the boss part are directly connected to each other. By (tight) joining and tightening the joint with bolts, the valve body is held firmly connected directly to one pipe flange. At this time, by making the bolt holes for the upper and lower piping the same size as the flange standard, the core will surely come out and will match well with the pipeline core.

In addition, by using the space between each boss on the periphery of the valve body and fastening the flanges of both pipes with long bolts, installation in the pipeline can be made easy, and the valve can be attached to the end of the pipe. When the valve body is installed, it is easy to install the companion flange to the other end face, which strengthens and secures the attachment of the valve body at the end of the pipe, and also makes it easier for expansion work. Accordingly, when welding a pipe to the companion flange, only this flange can be removed from the valve body and welded to the pipe, improving work efficiency.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

1A, 1B, and 1C are a perspective view, a front view, and a side view of a butterfly valve showing an embodiment of the present invention. Boss part 15 in which piping bolt hole 14 is drilled offset to the left side in Fig. 1C
is provided. In the figure, 7, 7, . . . indicate the positions of long bolts that pass between the upper and lower boss portions 15 and connect the pipe flanges on both sides.

2A to 2C are front views, side views, and explanatory views of main parts of butterfly valves showing different embodiments of the present invention. A boss part 15 is provided with a bolt hole 14 for piping, which is offset to the left side in Fig. 2B, and a boss part 15 is also provided on the peripheral edge other than the upper and lower parts, which is also offset to one end face. Two boss portions 16 each having a bolt hole 14 are provided on each side as appropriate.

The thickness t of the boss portion 15 is the thickness of the pipe flange 6
It is determined in consideration of the height h of the hexagonal nut 8a of the piping bolt 8 that joins the boss portion 15, etc. In addition, in the figure, 7, 7... are the boss portions 15, 15 of the valve body,
16 shows the position of the long bolt (double-cut bolt) that connects the pipe flanges on both sides.

According to these embodiments, as described above, the pipe flange 6 and the boss portion 15 provided on the end face of the valve body are connected by the piping bolt 8 and the hexagonal bolt 8.
By tightening with a, the butterfly valve is firmly held on the pipe flange 6. Also,
When installing a butterfly valve in a pipeline,
As shown in FIG. 5, two pipe flanges 6, 6 located on both sides of the butterfly valve are fastened by long bolts 7 and hexagonal nuts 7a.

Figure 3 shows a structure that is provided with bosses 16 on the periphery of the upper and lower bosses 15, one each on the left and right, and three long bolts 7 on the left and right that directly connect the pipe flanges on both sides without going through these bosses. 2 shows different embodiments of the present invention.

In each of the above embodiments, the number of bosses is usually 4 at the top and bottom until the valve diameter is about 200A (200mm).
In the case of a larger butterfly valve, two to four bosses are provided on the periphery outside the upper and lower parts.

FIG. 4 shows an embodiment in which a butterfly valve is installed at the end of a pipe, in which a flange 41 is brought into contact with the other end surface of the valve body 1 that is not connected to the pipe, and the pipe flange 6 and the flange 41 are connected with long bolts. 7 and a hexagonal nut 7a to sandwich the valve body.

According to this embodiment, the upper and lower boss portions 15, 1
In addition to being connected and held to the pipe flange 6 only by 5,
Since it will be joined to the pipe flange 6 via the flange 41 and bolts 7, the butterfly valve 1
The holding power of is strengthened. Also, when expanding the pipeline (Fig. 11), remove the flange 41,
After welding the pipe to this, it is possible to connect it to the valve body again, so there is no inconvenience as in the conventional one (FIG. 9).

(Effects of the invention) As explained above, according to the invention, since the boss portion with a reduced thickness and provided with bolt holes for piping work is provided offset to the end face of the valve body, (i) pipe flange It is possible to make a strong connection with
In addition, for installation in the pipeline, use the gap between the boss parts and tighten both pipe flanges with long bolts across the valve body.
Can be easily combined. In addition, (ii) by making the bolt holes for the upper and lower piping the same size as the flange standard, the core will surely come out and piping work can be done easily. (iii) Since the valve body is held by one pipe flange, it is easy to attach the valve body to the end of the pipe and, if appropriate, attach a companion flange to the other end to strengthen the holding force. During expansion work, work can be done with the valve body attached to the end of the pipe, improving work efficiency.

[Brief explanation of drawings]

1A, 1B, and 1C are perspective views, front views, and side views of a butterfly valve showing an embodiment of the present invention, and FIGS. 2A, 2B, 2C, and 3.
The figures are front and side views showing different embodiments of the present invention, Figures 4 and 5 are side views showing examples of how the butterfly valve of the present invention is used, and Figures 6A to 6C and 7 are A front view, a side view, or a perspective view of a conventional butterfly valve. FIGS. 8 and 9 are side views showing how the conventional butterfly valve is used. FIG. 10 is a side view of a blind flange attached to the end of a pipe. figure,
FIG. 11 is a piping diagram. 1... Valve body, 2... Valve plate, 3... Elastic seat ring, 6... Pipe flange, 7, 8... Bolt, 4, 14... Piping bolt hole, 5a, 5b,
15, 16...Boss section.

Claims (1)

[Scope of utility model registration request] This butterfly valve has an elastic seat ring made of an elastic material interposed on the entire inner circumferential surface of a hollow cylindrical valve body made of a rigid material, and the face-to-face dimensions are extremely narrow in order to make the entire valve light, thin, and short. In addition, in butterfly valves that have piping bolt holes near the top and bottom of the valve body to facilitate piping, the boss part, which has piping bolt holes and is made thinner, is attached to the hollow cylindrical valve body. A butterfly valve characterized in that it is provided near the upper and lower parts of the valve body so as to be biased toward one of the end faces of the valve body.