JP2012082914A - Butterfly valve and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a butterfly valve which requires a lining layer on an inner surface of a fluid path of a valve box and which is manufactured by dividing the valve box of the butterfly valve into a plurality of components.SOLUTION: The butterfly valve includes a valve box 1 having a fluid path therein, a valve shaft 2 provided inside the valve box 1, and a valve element 3 mounted on the valve shaft 2. The valve box 1 is divided into a plurality of metal components 11 around the fluid path F, and the fluid path F is constituted by fastening the plurality of components 11, 11. A rubber or resin lining layer 10 is applied on an inner surface of the fluid path F. The plurality of components 11, 11 are fastened while facing metal materials are directly in contact with each other. Since the components 11, 11 manufactured in a split manner are fastened while the metal materials are directly in contact with each other, the deterioration of an inner diameter size of the fluid path F is prevented. Further, the joining part is metal-touch, and thereby the generation of a gap or loosening between the joining surfaces with the lapse of time is prevented.

Description

  The present invention relates to a butterfly valve and a method for manufacturing a butterfly valve.

  The butterfly valve is an open / close valve installed in various fluid passages for transferring fluid such as liquid or gas. As shown in FIG. 5, for example, the valve shaft 30 is penetrated through a valve box 30 having a fluid passage having a circular cross section so as to cross the fluid passage. It is common to have attached.

  The upper part of the valve box 30 has an upper valve shaft support part 37 that penetrates the valve box 30 inward and outward, and the lower part of the valve box 30 penetrates the valve box 30 inward and outward or has a bottomed bottom. A valve shaft support portion 38 is provided, and the valve shaft is fitted in the upper and lower valve shaft support portions 37, 38 via bushes, liners, and the like so as to be rotatable about the shaft. The valve body rotates around the axis of the valve shaft to open and close the fluid path.

  In recent years, a large-diameter butterfly valve has been increasingly used as an example of this butterfly valve. Many of these are also used.

  Further, in these butterfly valves, a lining layer 35 made of rubber or resin is often provided on the inner surface of the fluid path in order to prevent direct contact between the metal portion of the valve box and the fluid. As an example of lining with respect to the inner surface of a fluid path, there exist a thing of patent documents 1 and 2, for example.

Japanese Examined Patent Publication No. 2-58984 (page 8, Fig. 5) JP-A-11-257501 (2nd page paragraph 0008, 3rd page paragraphs 0015 to 0016, 5th page paragraph 0036, 6th page FIG. 5)

  Large-diameter butterfly valves may cause transportation problems from the factory that manufactures the butterfly valve to the site where the butterfly valve is installed. This is because, under the Road Traffic Law, there is a limit on the weight and size (height / width) of cargo that can be loaded on a car, and anything exceeding this cannot be transported.

  In order to solve the above transportation problem, as shown in Patent Documents 1 and 2, the butterfly valve box 30 is manufactured by dividing it into a plurality of constituent members 31 and 31, and the divided constituent members 31 and 31 are divided. A method of assembling on-site after transporting (see FIGS. 5A and 5B) is conceivable.

However, when the lining layer 35 is required on the inner surface of the fluid path of the valve box, the inner diameter dimension of the fluid path can be reduced by interposing the lining layer 35 between the flanges 32, 32 of the divided component members 31, 31. There is a risk that accuracy will deteriorate. This is because the lining layer 35 is richer in elasticity than the metal that is the material of the valve box, and the degree of elastic deformation differs depending on the degree of tightening between the joint surfaces.
Further, when the lining layer 35 deteriorates due to the aging of the butterfly valve, there is a possibility that it may lead to looseness between the joint surfaces and generation of a gap.

  Accordingly, an object of the present invention is to provide a butterfly valve that requires a lining layer on the inner surface of the fluid passage of the valve box, and to make the valve box of the butterfly valve divided into a plurality of components.

  In order to solve the above problems, the present invention includes a valve box having a fluid path therein, a valve shaft provided in the valve box, and a valve body attached to the valve shaft, The valve box is divided into a plurality of metal components around the fluid path, and the fluid path is configured by fastening the plurality of components, and a rubber or resin lining layer is formed on the inner surface of the fluid path. In the applied butterfly valve, the butterfly valve is characterized in that the plurality of constituent members are fastened in a state where opposing metal materials are in direct contact with each other.

  According to this configuration, the component members manufactured separately are fastened in a state where the opposing metal materials are in direct contact with each other, and are in a so-called metal touch state. It is possible to prevent deterioration in accuracy as in the case where a lining layer is interposed. Further, since the joint portion is a metal touch, it is possible to prevent looseness and gaps between the joint surfaces due to aging.

  In addition, since the valve box of the butterfly valve can be manufactured by dividing it into a plurality of structural members, particularly when rubber is used as the material of the lining layer, a large vulcanizing can is not prepared. , Vulcanization treatment (pressure vulcanization) using a normal vulcanization can without vulcanization outside the can (method of closing the fluid passage opening and using the valve box itself as a vulcanization can) It is also possible to do this.

  In this configuration, various configurations may be adopted for the joining structure of the component members manufactured separately. For example, the plurality of component members each have a flange extending along the direction of the fluid path. The structure which the opposing surfaces of the flange are contacting directly can be employ | adopted. By tightening the opposing flanges with bolts, nuts, etc., the constituent members can be joined to form a fluid path.

  In addition, it is also possible to interpose packing between the joint surfaces (the said opposing surfaces). If a recess into which the packing enters either or both of the bonding surfaces is formed, the packing can more securely stop water between the bonding surfaces in the metal touch state.

  In the method for manufacturing a butterfly valve having these configurations, the following methods can be employed.

  That is, the plurality of constituent members are each provided with a rubber or resin lining layer on the inner surface of the fluid passage in a state before fastening, and the fluid passages are fastened in the valve box by fastening the plurality of constituent members. Then, an auxiliary lining layer of rubber or resin is applied to the joint portion between the constituent members.

There may be a portion where the lining layer is not continuous in the joint portion between the constituent members. This is because when the lining process is performed on the part corresponding to the fluid path inner surface of each component, the lining range is kept slightly far from the joint so that the lining does not enter the joint surface. Can occur.
In such a case, discontinuity of the lining layer can be eliminated by providing an auxiliary lining layer at the joint after the constituent members are joined. Further, even when there is no discontinuity of the lining layer at the joint, it is preferable to provide an auxiliary lining layer for water stoppage of the joint. At this time, the attachment of the valve shaft and the valve body to the inside of the valve box may be performed before or simultaneously with the fastening of the constituent members, or after the fastening and before the application of the auxiliary lining layer. Or after applying an auxiliary lining layer.

  It should be noted that the lining process in a limited range such as the auxiliary lining layer is usually performed in repair work for the damaged portion of the lining layer, and it is considered that there is no problem in durability. In addition, if the auxiliary lining layer is made of natural vulcanized rubber, it is convenient that a complicated vulcanization operation that is performed when pressure vulcanized rubber is employed can be omitted.

  Further, as a method for manufacturing a butterfly valve having each of these configurations, after the plurality of components are fastened to form the fluid path, a rubber or resin lining layer is applied to the inner surface of the fluid path, It is also possible to adopt a method of attaching a valve shaft and a valve body inside. That is, after assembling the valve box, a lining layer is applied to the inner surface. According to this method, without providing the auxiliary lining layer, discontinuity of the lining layer does not occur, and good water stoppage can be exhibited without providing the auxiliary lining layer.

  In the present invention, since the component members manufactured separately are fastened in a state where the opposing metal materials are in direct contact with each other, it is possible to prevent deterioration of the accuracy of the inner diameter dimension of the fluid path, and the joining thereof. Since the part is a metal touch, it is possible to prevent looseness and gaps between the joint surfaces due to aging.

1 shows an embodiment of the present invention, (a) is a front view of a valve box of a butterfly valve, (b) is a right side view of (a). (A) is an enlarged view of the main part of FIG. 1 (a), (b) is an enlarged view of the main part of FIG. 1 (b). The perspective view of the valve box of the butterfly valve of the embodiment Front view of valve box of butterfly valve of other embodiment (A) is a partially cut front view of the valve box of the butterfly valve of the conventional example, (b) is an enlarged view of the main part of (a).

  Embodiments of the present invention will be described with reference to the drawings. The butterfly valve of this embodiment is a large-diameter butterfly valve installed in a fluid path F for transferring seawater in a condenser circulation water pipe system used in a nuclear power plant.

  As shown in FIGS. 1 (a) and 1 (b), the butterfly valve is configured so that the valve shaft 2 penetrates the valve box 1 having a circular fluid passage F in the vertical direction so as to cross the fluid passage F. Provided. Further, a valve body 3 having a circular shape in front view is attached to the valve shaft 2 (the valve shaft 2 and the valve body 3 are shown only in FIG. 1B).

The upper part of the valve box 1 has an upper valve shaft support part 7 that penetrates the valve box 1 in and out, and the lower part of the valve box 1 has a lower valve shaft support part 8 that penetrates the valve box 1 in and out. Is provided. The valve shaft 2 is fitted into the upper and lower valve shaft support portions 7 and 8 via a bush, a liner 10 ', and the like so as to be rotatable about the shaft (see FIG. 2B).
Then, the valve body 3 rotates around the axis of the valve shaft 2 to open and close the fluid path F. That is, the seawater transferred through the fluid path F is blocked and opened by opening and closing the butterfly valve, or the flow rate thereof is adjusted.

  As shown in FIG. 1, the valve box 1 has a cylindrical shape having a fluid path F therein. The valve box 1 is composed of metal constituent members 11, 11 that form two circular arcs around the fluid path F.

Each component 11 includes flanges 12 at both ends of the arc along the direction in which the fluid path F extends. The two constituent members 11, 11 face each other, the opposing surfaces 13, 13 (hereinafter referred to as joint surfaces 13) of the opposing flanges 12, 12 are brought into surface contact with each other, and bolts 16 are inserted into holes provided in the flange 12. It is inserted and fixed with a nut 17.
The valve box 1 is assembled by fastening the two constituent members 11, 11, and the fluid path F is configured therein.

  In addition, pipe end flange portions 5 are provided at both ends of the valve box 1 in the pipe axis direction (direction in which the fluid passage F extends), and can be connected to adjacent pipe bodies or the like.

A rubber lining layer 10 is provided on the inner surface of the fluid path F in the valve box 1. The lining layer 10 is applied only to a portion corresponding to the inner surface of the fluid path F among the surfaces of the constituent members 11, 11, and is not applied to the joint surface 13 of the flange 12.
For this reason, as shown in FIG. 2A, the constituent members 11 and 11 are fastened on the joint surface 13 of the flange 12 in a state where the facing metal materials are in direct contact with each other.

For this reason, the component members 11 manufactured separately are fastened in a state in which the metal materials facing each other are in direct contact with each other, and are in a so-called metal touch state.
Therefore, it is possible to prevent deterioration of the accuracy of the inner diameter dimension of the fluid path F due to the lining layer 10 being interposed between the joining surfaces. Further, since the joint portion is a metal touch, it is possible to prevent looseness and gaps between the joint surfaces 13 and 13 due to aging.

  As shown in FIG. 2A, a rubber auxiliary lining layer 20 is applied to the joint between the constituent members 11 and 11. This is because the portion where the lining layer 10 is not continuous may be present at the joint between the constituent members 11 and 11 (the portion where the joint surface 13 faces the fluid path F). After that, by providing the auxiliary lining layer 20 at the joint, the object is to eliminate the discontinuity of the lining layer 10 and to stop water more reliably.

  Thus, since the valve box 1 of the butterfly valve can be manufactured by being divided into a plurality of constituent members 11 and 11, particularly when rubber is used as the lining layer 10 as in this embodiment, It is possible to carry out the vulcanization treatment using a normal size vulcanizing can without preparing a large vulcanizing can and without performing vulcanization outside the can.

  The auxiliary lining layer 20 is made of natural vulcanized rubber that does not require a pressure vulcanization process using a vulcanizing can or the like. In this embodiment, chloroprene rubber is used as the rubber material for the lining layer 10 and the auxiliary lining layer 20, but other rubber materials may be used.

  Further, in this embodiment, a packing 15 is interposed between the joint surfaces 13 and 13 of the flanges 12 and 12 as shown in FIG. The packing 15 is accommodated in a recess 14 provided on one side of the bonding surface 13, and the packing 15 backs up the water stop between the bonding surfaces 13 and 13 in a metal touch state, thereby making it safer. The recess 14 and the packing 15 are provided over the entire length of the valve box 1 in the tube axis direction.

  Further, in this embodiment, the valve box 1 is configured by metal constituent members 11 and 11 that form two circular arcs around the fluid path F, but is not limited to this embodiment. The number of constituent members 11 constituting the box 1 can be set freely. For example, as shown in FIG. 4, the valve box 1 is divided into four metal arcuate component members 11 around the fluid path F, and the four component members 11 are joined to each other, thereby connecting the valve box 1 and the fluid. The path F may be configured.

  The manufacturing method of the butterfly valve which consists of each of these composition is explained.

  When manufacturing this butterfly valve, first, the plurality of constituent members 11, 11 constituting the valve box 1 are in a state before fastening, that is, in a state before the valve box 1 is assembled. A lining layer 10 made of rubber is applied to the inner surface. A pressure vulcanized rubber is used for the lining layer 10, and its construction is usually performed using a vulcanized can at a factory.

  At the site, the two component members 11, 11 conveyed are fastened to assemble the valve box 1, and the fluid path F is formed in the valve box 1. In this assembly, the two constituent members 11 and 11 face each other, the joint surfaces 13 and 13 of the opposing flanges 12 and 12 are brought into surface contact with each other, a bolt 16 is inserted into a hole provided in the flange 12, and a nut 17 is used. Tighten and fix.

At this time, in the inner surface of the fluid path F, when a portion where the lining layer 10 is not continuous is present at the joint between the constituent members 11 and 11, an auxiliary lining of rubber is present at the joint between the constituent members 11 and 11 Layer 20 is applied.
Since natural vulcanized rubber is used as the rubber material, no vulcanization step is required for the construction of the auxiliary lining layer 20. In addition to the natural vulcanized rubber, a rubber or resin material for repair that is usually used when the lining layer 10 is damaged can be adopted as the material of the auxiliary lining layer 20.

  Finally, parts necessary for the configuration of the butterfly valve such as the valve shaft 2 and the valve body 3 are attached to complete the butterfly valve. The butterfly valve is connected to the pipe line of the condenser circulating water pipe system via the pipe end flange portion 5.

  In these embodiments, the inner surface of the fluid passage F is provided with the rubber lining layer 10, but a resin may be used instead of the rubber.

  Further, in these embodiments, the fluid passage F is configured in the valve box 1 by fastening the plurality of constituent members 11, 11 separately provided with the lining layer 10, but there is a problem in transportation of the butterfly valve after lining. In the case where there is not, a plurality of constituent members 11, 11 are fastened to form the fluid path F in the valve box 1, and then a rubber or resin lining layer 10 may be applied to the entire inner surface of the fluid path F. .

  That is, after assembling the valve box 1, the lining layer 10 is applied to the inner surface thereof, and then the valve shaft 2 and the valve body 3 are attached to the inside of the valve box 1. According to this method, since the lining layer 10 can be formed all at once on the entire inner surface of the fluid path F, it is possible to reliably stop water without causing discontinuity of the lining layer 10 without providing the auxiliary lining layer 20. it can.

1,30 Valve box 2 Valve shaft 3 Valve body 4 Inner surface 5 Pipe end flange portion 7 Upper valve shaft support portion 8 Lower valve shaft support portion 10, 35 Lining layer 10 'Liner 11, 31 Component members 12, 32 Flange 13 Joint surface 14 Recess 15 Packing 16 Bolt 17 Nut 20 Auxiliary lining layer

Claims (5)

A valve box (1) having a fluid path therein, a valve shaft (2) provided in the valve box (1), and a valve body (3) attached to the valve shaft (2) The valve box (1) is divided into a plurality of metal constituent members (11) around the fluid passage (F), and the fluid passages (11, 11) are fastened by fastening the plurality of constituent members (11, 11). F), and a butterfly valve in which a rubber or resin lining layer (10) is applied to the inner surface of the fluid path (F),
The butterfly valve characterized in that the plurality of constituent members (11, 11) are fastened in a state where opposing metal materials are in direct contact with each other.   Each of the plurality of constituent members (11, 11) has a flange (12, 12) extending along the direction of the fluid path (F), and facing surfaces (13, 13) of the flange (12, 12). The butterfly valves according to claim 1, wherein they are in direct contact with each other. 3. The method for manufacturing a butterfly valve according to claim 1, wherein the plurality of component members (11, 11) are each provided with a rubber or resin lining layer (10) on the inner surface of the fluid path (F) in a state before being fastened. ) Is given,
After the plurality of constituent members (11, 11) are fastened to form the fluid path (F) in the valve box (1), rubber or resin is bonded to the joint between the constituent members (11, 11). A method for manufacturing a butterfly valve, characterized by applying an auxiliary lining layer (20).   The method for manufacturing a butterfly valve according to claim 3, wherein the auxiliary lining layer (20) is made of natural vulcanized rubber.   3. The method for manufacturing a butterfly valve according to claim 1, wherein after the plurality of constituent members (11, 11) are fastened to form the fluid path (F), rubber is formed on an inner surface of the fluid path (F). Or the manufacturing method of the butterfly valve characterized by providing a resin lining layer (10) and attaching a valve stem (2) and a valve body (3) inside a valve box (1).

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