JP2018128048A - Gasket and flange connection structure of piping material using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gasket which can be mounted while centering on flanges of pipes arranged in a horizontal direction in addition to a pipe in a vertical direction and which can be used for a plurality of different working pressures while preventing an erroneous tightening position. Provided is a flange joining structure for piping equipment using. An annular sealing surface 22 is provided on both sides of a substantially annular gasket body 10, and a plurality of bolt holes 30 and 31 corresponding to a plurality of working pressure flange surfaces 20 are provided on the outer peripheral side of the annular sealing surface 22. , 32, 35, 36 are arranged. [Selection diagram] Fig. 3

Description

  The present invention is used for joining piping equipment such as a valve, a straight pipe, a deformed pipe, or a faucet, and particularly relates to a gasket suitable for use at different operating pressures and a flange joining structure of the piping equipment using the gasket.

Conventionally, when connecting piping equipment such as valves and faucets with flange joints, a sealing gasket for sealing a fluid of a predetermined pressure is generally installed between the joint surfaces of the flanges. Usually, it is often sandwiched between flanges via bolts and nuts.
As this type of gasket, for example, the packing of Patent Document 1 is disclosed. This packing is interposed on the inner peripheral side (inner diameter side) between the flanges of the two pipe joints, and the flanges on the outer peripheral side are fastened with bolt nuts, so that they are positioned inside the bolt nuts. The sealing surface is in close contact with the state. A gasket that is mounted and positioned inside this type of bolt is called a ring gasket and prevents leakage of fluid through it.

  On the other hand, in Patent Document 2, the width of the pressure receiving surface is expanded in the outer circumferential direction to the vicinity of the outer diameter of the flange surface of the pipe joint, and a bolt hole is formed in the pressure receiving surface. Such a gasket is called a full-face gasket, and is arranged in a state where it is positioned on the substantially entire surface between the flange surfaces and is positioned by a bolt nut through a bolt hole so that a sealing property is exhibited. It has become.

  In general, the gasket of each shape is provided with a flat sealing surface. For example, the sealing surface is stepped and has a flat flange (RF (Raised Face) flange), or a seal. As a gasket for a flange (FF (Flat Face) flange: full face seat type) whose surface is a flat surface, it is sandwiched in a state of surface contact with each flange.

Japanese Utility Model Publication No. 63-62693 Japanese Utility Model Publication No. 58-79167

  When the pipes having the RF flange and the FF flange described above are arranged in the horizontal direction, the gasket is mounted in an upright state between the flanges, so that it is difficult to position the gasket and the flange. It becomes difficult to wear while centering.

  When a ring gasket such as the former Patent Document 1 is used, the gasket is disposed inside the bolt and nut by sandwiching the flanges, so that the flange and the gasket are not centered at the center. There is. In this case, it becomes difficult to fix the gasket uniformly, and there is a risk of water leakage from the flange.

When a full-face gasket such as the latter patent document 2 is used, the center of the flange can be made coincident with the bolt hole. However, in this case, since the number of bolts and nuts, the diameter of the bolt hole, and the pitch circle thereof vary depending on the operating pressure, it is necessary to prepare in advance a gasket provided with a bolt hole according to each operating pressure.
On the other hand, for example, if bolts corresponding to various pressure flanges are provided in the gasket for pipes having different nominal diameters such as nominal diameter 150 and nominal diameter 200, the number of bolt holes increases. The arrangement of the holes becomes complicated, and there is a possibility that the bolt nut is erroneously tightened into a bolt hole different from the bolt hole that should be originally used when an operator works. In this case, the sealing performance is not sufficient, leading to leakage.

  The present invention has been developed in order to solve the above-described problems. The object of the present invention is to center the flanges of the pipes arranged in the horizontal direction in addition to the pipes in the vertical direction. An object of the present invention is to provide a gasket that can be mounted while being used and can be used for a plurality of different operating pressures while preventing erroneous tightening positions, and a flange joint structure for piping equipment using the gasket.

  In order to achieve the above object, according to the first aspect of the present invention, an annular seal surface is provided on both sides of a substantially annular gasket body, and a plurality of flanges corresponding to a plurality of working pressure flanges are provided on the outer peripheral side of the annular seal surface. This is a gasket in which bolt holes are provided.

  According to the second aspect of the present invention, at least two bolt holes among the bolt holes are provided at positions serving as a reference of the gasket body, and the bolts are positioned at positions corresponding to the flanges of a plurality of operating pressures based on these bolt holes. The gasket is provided with holes.

  According to a third aspect of the present invention, the gasket body has a plurality of handles for suspending, and the handles are on an extension of the center line of the gasket body, and bolt holes are provided corresponding to flanges of different operating pressures. It is a gasket provided at each allocated position.

  The invention according to claim 4 is a gasket in which a bolt hole other than the bolt hole serving as a reference position is covered with a thin film-shaped shielding part, and a notch part for inserting a bolt is formed in the shielding part.

  The invention according to claim 5 is a gasket in which a shielding seal member for closing a bolt hole other than the bolt hole serving as a reference position is attached, and a notch for inserting a bolt is formed in the seal member.

  The invention according to claim 6 is a gasket that is attached to a shielding seal member that closes a bolt hole other than the bolt hole serving as a reference position, and is provided such that it can be peeled off when the bolt is inserted.

  The invention according to claim 7 is a gasket in which an annular convex portion or an annular concave portion serving as a mark is provided on a peripheral edge of a bolt hole serving as a reference position.

  The invention according to claim 8 is a gasket in which a tag serving as a mark made of a member different from the gasket body is detachably attached to a bolt hole serving as a reference position.

  The invention according to claim 9 is a gasket in which a tag serving as a mark integrally with the gasket main body is detachably integrally formed in the vicinity of a bolt hole serving as a reference position.

  The invention according to claim 10 is a flange joint structure in which the gasket body is joined between the flange surfaces facing each other of the joint portion of the piping equipment, and the gasket body has an annular seal surface on both sides and the annular seal surface. A plurality of bolt holes located on the outer peripheral side of the annular seal surface are provided, and the bolt holes are positioned corresponding to the flanges of a plurality of operating pressures. In this state, the bolts are flange-joined via the bolt holes. This is a flange joint structure for piping equipment.

  In the invention according to claim 11, the piping equipment is a repair valve. The joint part of the repair valve on the primary side and the joint part of the rising pipe, the joint part on the secondary side of the repair valve and the air valve or the fire hydrant, and the short pipe This is a flange joint structure for piping equipment in which joint parts are joined via gasket bodies.

  According to the invention according to claim 1, by aligning the plurality of bolt holes provided on the outer peripheral side of the annular seal surface with the flange, not only the piping in the vertical direction but also between the flanges of the piping arranged in the horizontal direction. It can also be mounted while centering, and can be used for a plurality of different operating pressures while preventing erroneous tightening positions. In this case, a bolt hole suitable for the bolt pitch and hole diameter of the flange can be matched by forming a bolt hole for each type on a bolt pitch circle that varies depending on the operating pressure.

  According to the second aspect of the present invention, at least two bolt holes among the bolt holes are arranged as reference positions so that the bolts of various flanges can be inserted, so that when used for flanges having different working pressures, By aligning at least two bolt holes with the bolt holes of each flange, the bolt holes of the gasket body can be aligned with the other bolt holes of the flange portion. By guiding the operator to the reference bolt hole, the flange piping work can be performed smoothly without being aware of the difference in the nominal pressure.

  According to the invention of claim 3, when holding the handle corresponding to each operating pressure during horizontal piping and inserting the gasket body from the vertical direction between the flanges, the appropriate bolt hole of the gasket body with respect to the bolt hole of the flange The bolts and nuts can be easily tightened.

  According to the fourth aspect of the invention, the bolt holes other than the bolt holes at the reference position are covered with the thin film portion, so that the bolt holes at the reference position can be easily recognized, and the bolt holes of the flange and the gasket body Since the bolt can be inserted into the thin film portion after aligning with the hole, positioning of the bolt hole is facilitated. Since the bolt is sandwiched between the notches and the position is maintained, the bolt can be prevented from dropping, and in particular, it is possible to reliably prevent the bolt from falling off easily during vertical piping.

  According to the invention which concerns on Claim 5, it is easy to recognize the bolt hole of a reference | standard position by sticking the sealing member for shielding which has a notch part for bolt insertion to bolt holes other than the bolt hole used as a reference | standard position. And since a bolt can be inserted in the state which provided the sealing member after aligning the bolt hole of a flange and the bolt hole of a gasket main body, position alignment of a bolt hole becomes easy.

  According to the invention which concerns on Claim 6, it is easy to recognize the bolt hole of reference positions other than the bolt hole which stuck the sealing member for shielding, and after sealing the bolt hole of a flange and the bolt hole of a gasket main body, a sealing member is attached. Since the bolts can be inserted after being peeled, the bolt holes can be easily aligned.

  According to the seventh aspect of the present invention, by providing an annular convex portion or an annular concave portion at the periphery of the bolt hole serving as the reference position, it becomes easier for the operator to recognize the bolt hole serving as the reference by visual observation or touch. Positioning becomes easy.

  According to the eighth aspect of the invention, the bolt hole serving as the reference position is provided with a tag separate from the gasket body, so that the operator can easily recognize the bolt hole serving as the reference, and the bolt is aligned. The tag can be easily removed after the bolt is inserted.

  According to the ninth aspect of the present invention, the tag is integrally formed in the vicinity of the bolt hole serving as the reference position, so that the operator can easily recognize the bolt hole serving as the reference, and the bolt can be easily aligned. Thus, the tag can be easily removed after the bolt is inserted. The number of parts is reduced by the integral molding of the tag, and the work of attaching the tag near the bolt hole is not required.

  According to the invention of claim 10, the flange can be used for either a flat seat flange or a full face flange, and the bolt holes are flanges with different working pressures while the annular seal surface is in contact with the flange surface. Since the gasket body can be used as a gasket body, the gasket body is mounted between the flange surfaces in a centered state to ensure high sealing performance.

  According to the invention which concerns on Claim 11, the repair valve from which working pressure differs is joined via a gasket main body between a riser pipe, an air valve, a fire hydrant, and a short pipe, and water from between the flange joint parts of a repair valve is obtained. This repair valve can be opened and closed while preventing leakage.

It is an external view which shows the state which carried out flange joint of the repair valve. It is an external view which shows the state before the flange joining of FIG. It is a top view which shows 1st Embodiment of the gasket of this invention. It is a top view which shows the state which inserted the volt | bolt in the gasket of FIG. It is a schematic diagram which shows the state which suspended the gasket of FIG. It is a top view which shows 2nd Embodiment of the gasket of this invention. It is a top view which shows the state which inserted the volt | bolt in the gasket of FIG. It is a schematic diagram which shows the state which suspended the gasket of FIG. It is an external view which shows 3rd Embodiment of the gasket of this invention. (A) is a top view of a gasket. (B) is AA sectional drawing of (a). It is a top view which shows 4th Embodiment of the gasket of this invention. It is a top view which shows 5th Embodiment of the gasket of this invention. It is a top view which shows 6th Embodiment of the gasket of this invention. It is a top view which shows 7th Embodiment of the gasket of this invention. It is a top view which shows 8th Embodiment of the gasket of this invention. It is an external view which shows 9th Embodiment of the gasket of this invention. (A) is a top view of a gasket. (B) is BB sectional drawing of (a). It is a top view which shows 10th Embodiment of the gasket of this invention. (A) is a top view of a gasket. (B) is CC sectional drawing of (a). It is a top view which shows 11th Embodiment of the gasket of this invention. It is a top view which shows 12th Embodiment of the gasket of this invention.

  Hereinafter, embodiments of a gasket and a flange joint structure for piping equipment using the gasket according to the present invention will be described in detail with reference to the drawings. 1 and 2 show a state in which the repair valve is flange-joined via the gasket of the present invention, and FIG. 3 shows a first embodiment of the gasket of the present invention. This example shows a case where the nominal diameter of the pipe is 150. Also, in this example, the dimensions of the flange corresponding to the Japan Waterworks Church JWWA G 114: 2015 water duct ductile cast iron irregular shape table A.23, Table A.24, Table A.25.

  The repair valve (hereinafter referred to as repair valve main body 1) shown in FIG. 1 is a kind of piping equipment, and the gasket of the present invention (hereinafter referred to as gasket main body 10) rises from the primary side of the repair valve main body 1 to the pipe. 2 is provided when the secondary side of the repair valve body 1 is joined to an air valve (or a fire hydrant or short pipe not shown) 3. A joint portion 5 is provided on each of the repair valve body 1 on the primary and secondary sides, and the joint portion 5 is formed of an annular flange portion. Attached flange surface 20 is provided. On the other hand, the joint portion 5 is also provided on the secondary side of the riser 2 and the primary side of the air valve 3, and the flange surface 20 is similarly provided on the joint portion 5. The flange surface 20 in the present embodiment refers to a surface on which the gasket body 10 abuts and seals.

  As shown in FIG. 2, the gasket body 10 is formed between the primary joint portion 5 of the repair valve body 1 and the secondary joint portion 5 of the rising pipe 2, and between the secondary joint portion 5 of the repair valve body 1 and the air. They are respectively mounted between the primary side joint portion 5 of the valve 3. At that time, the gasket main body 10 is mounted between the opposing flange surfaces 20 and 20 of the joint portion 5 of the piping equipment 1, and in this state, the gasket main body 10 is flange-joined by a bolt nut (bolt) 6. The piping equipment 1 includes a valve having a flange joint, a straight pipe, and a deformed pipe.

  The gasket main body 10 of FIG. 3 is formed in a substantially annular shape by covering a core (not shown) with a covering portion 21 made of an elastic material such as rubber. The core metal may be omitted, and in that case, the gasket body 10 is integrally formed of an elastic material.

  Both surfaces of the gasket body 10 are provided symmetrically, and an annular seal surface 22 that is a surface in contact with the flange surface 20 is provided on both surfaces of the covering portion 21. The annular seal surface 22 is provided in a shape capable of abutting and sealing against flange surfaces 20 of different modes such as an RF flange surface and an FF flange surface, and the gasket body 10 is attached in a state where the annular seal surface 22 is sealed.

  On the outer peripheral side of the annular seal surface 22, an extending attachment portion 23 for attachment to the flange surface 20 is integrally provided. The extending attachment portion 23 is configured with a plurality of different diameters adapted to the flange surfaces 20 of a plurality of operating pressures. In this embodiment, the extending attachment portion 23 extends in accordance with the outer diameter of the entire surface of the RF-type or FF-type flange portion 5. Formed. The extending attachment 23 is provided with a diameter larger than at least a pitch circle of bolt holes 30 to 32 described later, and the gasket body 10 is attached between the flange surface 20 with the bolt nut 6 via the extending attachment 23. As a full-face gasket, it is provided so that it can be used on the flange surface in different modes.

  The extending attachment portion 23 is provided with bolt holes 30, 31, 32 for attachment to the flange surface 20 at a plurality of locations. The bolt holes 30 to 32 are arranged at a plurality of positions by a plurality of different pitch circles DP1, DP2, DP3 on the same center line so that one gasket body 10 can correspond to the flange surfaces 20 of a plurality of operating pressures. Arranged.

  Specifically, in FIG. 3 and FIG. 4, the bolt holes 30 are for a working pressure of 0.75 MPa (7.5 K), and are provided at six locations on the pitch DP 1 circle for the bolt nut 6. The bolt holes 31 are for a working pressure of 1.0 MPa (10 K), and are provided at eight locations on the pitch circle DP2 for the bolt nut 6. The bolt holes 32 are for bolt nuts 6 having a working pressure of 1.6 MPa (16 K), and are provided at 12 locations on the pitch circle DP3. Accordingly, the bolts and nuts 6, 8, and 12 are provided so as to be fastened and fixed. 4A shows a state in which the bolt nut 6 is inserted into each of the six bolt holes 30, and FIG. 4B shows a state in which the bolt nut 6 has been inserted into each of the eight bolt holes 31, FIG. 4C shows a state in which the bolt nut 6 is inserted into each of the twelve bolt holes 32.

  In the bolt holes 30, 31, 32 on each pitch circle, at least two bolt holes 30, 31, 32 are provided as bolt holes 35 in common as a reference position of the gasket body 10, The other bolt holes 30 to 32 are respectively arranged at positions corresponding to the flange surfaces 20 of a plurality of operating pressures with the two bolt holes 35 as a reference. In this example, two bolt holes 35 are provided at the positions indicated by hatching in the gasket body 10 in the state of FIG. 3, and the positions of the two bolt holes 35 are common to the bolt holes 30, 31, 32. And overlap.

  In the outer peripheral direction of the extending attachment portion 23, an arc-shaped ear portion 40 is formed by extending, and the ear portion 40 is provided in a step shape according to a difference in a plurality of operating pressures. The outer edges are adapted to match different flange outer diameters. Flange outer diameter display portions 41, 42, 43 are provided on the surface of the extending attachment portion 23 including the ear portion 40, and these flange outer diameter display portions 41 to 43 are used at a plurality of operating pressures of the flange surface 20. Accordingly, it is provided at a position indicating the position of the outer diameter.

  In the present embodiment, the outer peripheral edge of the extending attachment portion 23 is provided as a flange outer diameter display portion 41 having a working pressure of 1.0 MPa, and the flange outer diameter display portion 41 coincides with a flange surface having a working pressure of 1.0 MPa. A flange outer diameter display part 42 having a flange diameter of a working pressure of 0.75 MPa is provided at a portion of the ear part 40 that is one step larger than the extending attachment part 23. The flange outer diameter display part 42 has a working pressure of 0.75 MPa. It corresponds to the flange surface. A flange outer diameter display portion 43 having a flange diameter of 1.6 MPa is provided at the outer peripheral edge of the ear portion 40 on the diameter-expanding side with respect to the flange outer diameter display portion 42. It corresponds to a flange surface of 1.6 MPa.

  The ears 40 are formed at four locations on the gasket body 10, and the flange outer diameter indications of operating pressures of 0.75 MPa, 1.0 MPa, and 1.6 MPa are provided by the ears 40 and the portions sandwiched between the ears 40. The parts 41 to 43 are respectively provided in the circumferential direction.

  In the vicinity of the upper portion of the gasket main body 10 in FIG. 3, three handles 50, 51, 52 for suspension are provided so as to extend from the ear portion 40, and the gasket main body is suspended while pinching each handle 50 to 52. 10 can be aligned with the flange surface 20. The handles 50 to 51 are provided on the extended lines of the center lines L of the gasket body 10, and are provided at positions where the bolt holes 35 and the bolt holes 30 to 32 are allocated corresponding to the flange surfaces 20 having different operating pressures. That is, the bolt holes 30 to 32 corresponding to the handles 50 to 52 are formed in the flange surface 20 when the gasket body 10 is suspended by pinching the handles 50 to 52 to the flange surface 20 horizontally piped. It is adapted to the position of 26.

In addition, although this embodiment demonstrated the case where the gasket main body 10 respond | corresponds to the flange surface 20 of operating pressure 0.75MPa, 1.0MPa, 1.6MPa, other than this, standards other than JIS, JWWA, etc. In the case of overseas standards, the gasket body 10 can be provided in the same manner as described above.
Moreover, although the example which used the repair valve main body 1 as piping equipment was demonstrated, it can utilize also for flange connection of piping equipment, such as various valves and faucets which are not shown in figure other than the repair valve main body 1. FIG.

Next, the flange joint structure and operation of piping equipment using the above gasket body will be described.
When the repair valve main body 1 which is the piping equipment shown in FIGS. 1 and 2 is joined between the rising pipe 2 and the air valve 3 via the flange surface 20, the joint portions facing the piping equipment 1 are opposed to each other. The gasket body 10 described above is joined between the five flange surfaces 20.

  FIG. 5 shows the arrangement of bolt holes 35, 30, 31, 32 corresponding to the bolt holes 26 of the flange surface 20 of the RF-type flange having a nominal diameter 150 that is horizontally piped. FIG. 5A shows a state when the gasket body 10 is mounted on the flange surface 20 with a working pressure of 0.75 MPa. In this case, if the handle 50 is pinched and suspended, two bolt holes 35 at a reference position among the bolt holes for the working pressure 0.75 MPa overlap the bolt holes 26 on the flange surface 20, and the bolt A total of six bolt holes 30 on the pitch circle DP1 with the holes 35 as a reference are fastened and fixed with bolts and nuts 6, so that the gasket body 10 is mounted in a predetermined position and the two flange surfaces 20 are connected in a sealed state. it can.

  FIG. 5B shows a state when the gasket body 10 is mounted on the flange surface 20 with a working pressure of 1.0 MPa. In this case, if the handle 51 is pinched and suspended, two bolt holes 35 at a reference position among the bolt holes for a working pressure of 1.0 MPa overlap the bolt holes 26 of the flange surface 20, and the bolt A total of eight bolt holes 31 on the pitch circle DP2 with the holes 35 as a reference are fastened and fixed with bolts and nuts 6 so that the gasket body 10 is mounted in a predetermined position and the two flange surfaces 20 are connected in a sealed state. it can.

  FIG.5 (c) has shown the state when mounting | wearing with the gasket main body 10 with respect to the flange surface 20 of the working pressure 1.6MPa. In this case, if the handle 52 is pinched and suspended, two bolt holes 35 at a reference position among the bolt holes for a working pressure of 1.6 MPa overlap the bolt holes 26 of the flange surface 20, and the bolt A total of 12 bolt holes 32 on the pitch circle DP3 with the holes 35 as a reference are fastened and fixed with bolts and nuts 6 so that the gasket body 10 is mounted in a predetermined position and the two flange surfaces 20 are connected in a sealed state. it can.

  As described above, by aligning the two bolt holes 35 of the gasket main body 10 defined as a reference with the bolt holes 26 of the flange surface 20 of each working pressure, all the remaining bolt holes necessary for tightening are flanged. It can be easily aligned with the bolt hole 26 of the surface 20.

In FIG. 6, 2nd Embodiment of the gasket of this invention is shown. In the following embodiments, the same parts as those of the above-described embodiments are denoted by the same reference numerals, and the description thereof is omitted.
The gasket main body 60 of this embodiment is used for connecting a flange of a pipe having a nominal diameter of 200. Of the bolt holes 30 to 32 provided in the gasket main body 60, four locations indicated by cross hatching are used. Bolt holes 61 are provided at positions serving as a reference for the gasket main body 60, and bolt holes 30 to 32 are disposed at positions corresponding to the flange surfaces 20 of a plurality of operating pressures based on these bolt holes 61. The gasket body 60 is provided with two handles 62 and 63 for hanging.

  The bolt holes 30 for the working pressure 0.75 MPa in FIG. 7A are provided at eight positions on the pitch circle DP1 for the bolt nut 6. The bolt holes 31 for a working pressure of 1.0 MPa in FIG. 7B are provided at twelve locations on the pitch DP 2 circle for the bolt nut 6. The bolt holes 32 for bolt nuts having a working pressure of 1.6 MPa in FIG. 7C are provided at 12 positions on the pitch circle DP3. In this way, the bolts and nuts 6, 12 and 12 are tightened and fixed, respectively.

  FIG. 8 shows a state in which the bolt 6 is inserted into the flange surface 20 of the RF type flange having a nominal diameter 200 that is horizontally piped. FIG. 8A shows a state in which the gasket body 60 is attached to the flange surface 20 with a working pressure of 0.75 MPa. In this case, if the handle 62 is pinched and suspended, the four bolt holes 61 at the reference positions of the bolt holes 30 for the working pressure 0.75 MPa overlap the bolt holes 26 on the flange surface 20. A total of eight bolt holes 30 on the same pitch circle DP1 with the bolt holes 61 as a reference are tightened and fixed with bolt nuts 6 to connect the two flange surfaces 20 with the gasket body 60 mounted at a predetermined position. it can.

  FIG. 8B shows a state in which the gasket body 60 is attached to the flange surface 20 at a working pressure of 1.0 MPa. In this case, if the handle 63 is pinched and suspended, the four bolt holes 61 at the reference position of the bolt holes 31 for the working pressure of 1.0 MPa overlap the bolt holes 26 of the flange surface 20. A total of 12 bolt holes 31 on the same pitch circle DP2 with the bolt holes 61 as a reference are tightened and fixed with bolt nuts 6 to connect the two flange surfaces 20 with the gasket body 60 mounted in a predetermined position. it can.

  FIG.8 (c) has shown the state which mounts | wears with the gasket main body 60 with respect to the flange surface 20 of operating pressure 1.6MPa. In this case, as in the case of the working pressure of 1.0 MPa, if the handle 63 is pinched and suspended, the bolt holes 61 at four positions at the reference position among the bolt holes 32 for the working pressure of 1.6 MPa are used. Is overlapped with the bolt hole 26 of the flange surface 20, and a total of 12 bolt holes 32 on the same pitch circle DP3 on the basis of the bolt hole 61 are fastened and fixed with the bolt nuts 6 so that the gasket body 60 is mounted in a predetermined position. In this state, the two flange surfaces 20 can be connected.

FIG. 9 shows a third embodiment of the gasket of the present invention.
In the gasket main body 70 of this embodiment, bolt holes 35 serving as reference positions are provided at two locations in the same manner as the gasket main body 10 in FIG. 3, and bolt holes 30 to 32 other than the bolt holes 35 are integrated with the covering portion 21. These are made of rubber and are shielded by a thin-film shielding portion 71, and a notch portion 72 for inserting a bolt is formed in the shielding portion 71. Thereby, the bolt 6 can be inserted into the shielding part 71 after the gasket main body 70 is installed. The shielding part 71 can be provided simultaneously with the formation of the covering part 21.

  The cut portion 72 is formed by the number of cuts, the cut position, and the like so that the bolt nut 6 disposed in a predetermined bolt hole can be inserted into each bolt hole in a centered state according to the operating pressure. That is, when a plurality of bolt holes with different operating pressures are overlapped with each other, the bolt nuts 6 having different tightening positions at the respective operating pressures are guided to predetermined tightening positions while centering the bolt nuts 6. Possible cuts 72 are formed in one bolt hole.

On the other hand, since the reference bolt hole 35 is not provided with the shielding part 71, it can be easily distinguished from the bolt holes 30 to 32 when the shielding part is provided.
For these reasons, when the gasket body 70 is aligned with the flange surface 20, the bolt hole 35 at the reference position is easily aligned with the bolt hole 26 of the flange surface 20 without being aware of the difference in the nominal pressure. Thus, the gasket body 70 can be accurately fixed between the flange surfaces 20 with the bolts and nuts 6.

  The shielding part 71 may be thickened to increase the strength, or the shape of the notch part 72 may be adjusted. When the notch part 72 is provided, the bolt 6 is likely to drop, especially in vertical piping. The bolt 6 inserted into the bolt hole from below the flange surface 20 is sandwiched by the cut portion 72 and the position thereof is held, thereby exhibiting a function of preventing the bolt 6 from falling.

In this case, the bolt 6 is inserted into the bolt hole 26 of the flange surface 20 while being guided to the center of the bolt hole corresponding to a plurality of operating pressures through the notch portion 72. In this manner, the plurality of bolts 6 are inserted into the respective bolt holes 26 in a state of being arranged concentrically with respect to the center of the flange surface 20. Thereby, the gasket main body 70 is aligned with the flange surface 20 so that the center of each bolt hole follows the center of each bolt 6.
As a result, with the bolts 6 arranged concentrically with the center of the flange surface 20, the gasket body 70 can be aligned through each bolt hole, and can be attached while being centered at the center of the flange surface 20. Such a centering function can be exhibited for both general-purpose RF flange surfaces and FF flange surfaces.

  Further, even in horizontal piping, the gasket main body can be mounted in the centered state by the above function, and in this case, it is possible to prevent the gasket main body from being displaced downward due to gravity.

  When the cut portion 72 is provided in the shielding portion 71, the number of the cut portions 72 is increased or the cut portions 72 are formed according to the shape of the bolt hole that is used alone or combined due to the difference in the operating pressure. It is good to change. In this case, by reducing the resistance when the bolt 6 is inserted, there is no possibility of hindering the insertion of the bolt 6. On the other hand, by reducing the number of notches 72, it is possible to increase the resistance when the bolt 6 is inserted, thereby holding the bolt 6 and enhancing the fall prevention function. In any case, it is preferable to clarify the difference from the bolt hole 35 in which the shielding part 71 is not provided and to improve the visibility.

  In FIG. 9B, the shielding part 71 is provided on the insertion side (upper side in the figure) of the bolt holes 30 to 32, but the shielding part 71 is formed near the center of the bolt holes 30 to 32. It may be (not shown). In this case, the shielding portion 71 is in a symmetrical position with respect to the front and back surfaces of the gasket main body 70, so that it is not necessary for the operator to attach to the flange surface 20 while checking the mounting direction of the gasket main body 70.

FIG. 10 shows a fourth embodiment of the gasket of the present invention.
In the gasket main body 80 of this embodiment, two bolt holes 35 serving as a reference are provided, and the ear holes are positioned at positions corresponding to the outer diameter of the operating pressure 1.6 MPa (16 K) on the outer peripheral side of these bolt holes 35. A handle 81 that also functions as a part is provided. At the time of use for vertical piping, it is possible to reliably prevent the position of the reference bolt hole 35 from being misplaced by holding the handle 81 and performing alignment.
Furthermore, an ear portion 82 having an arcuate outer peripheral edge that is substantially the same as the outer diameter of the working pressure 16K is formed at the lowest position in the figure. When the gasket main body 80 is mounted, if the ear portion 82 is aligned with the outer diameter of 16K in addition to the above two handles 81, 81, it is accurately centered by aligning these three locations on the circumference. However, the gasket body 80 can be mounted.

  On the outermost peripheral side of the gasket body 80, an ear 40 for a working pressure of 0.75 MPa (7.5K) is formed over a wide range. As described above, by increasing the ear portion 40 in the range of the outer diameter portion of 7.5K that is most frequently used, the gasket body 80 can be easily aligned when the working pressure is 7.5K. .

In FIG. 11, it is a top view which shows 5th Embodiment of the gasket of this invention.
The gasket main body 90 of this embodiment is provided with a closing sealing member 91 that closes the bolt holes 30 to 32 other than the bolt hole 35 serving as a reference position so as to be pasted. A portion 92 is formed. 11A shows the seal member 91, and FIG. 11B shows the gasket main body 90 with the seal member 91 attached.

  The sealing member 91 is provided with a shielding portion 93 at a position of the bolt holes 30 to 32 other than the bolt hole 35 at the reference position, and the shielding portion 93 has a cut portion 92 having the same shape as the gasket main body 70 of FIG. Provided. As a result, the bolt 6 can be inserted from the shielding part 93 through the notch 92 after the seal member 91 is attached to the gasket main body 90 in a predetermined direction.

  Furthermore, as shown in the sixth embodiment of the gasket of the present invention shown in FIG. 12, the seal member 101 that can be attached to the gasket body 100 may be divided into two at the position of the reference bolt hole 35. In this case, it becomes easy to arrange the printing at the time of printing on the divided seal member 101, and the waste portion on the inner peripheral side can be omitted as compared with the case where the annular seal member is provided. For this reason, it is possible to increase the number of sealing members 101 from a certain sealing material while reducing the amount of discarded sealing material as a material and improving the yield. Attaching to the gasket main body 100 becomes easy, and wrinkles become more difficult.

  When the sealing members 91 and 101 are used, it is desirable to coat the surfaces of the gasket main bodies 90 and 100 with a clear resin or the like in order to increase the attaching force. In addition, it is necessary to maintain the adhesiveness after pasting of the seal members 91 and 101 and at the time of long-term storage, and to have an adhesive force that can prevent peeling off due to a decrease in adhesiveness or a decrease in adhesiveness due to deterioration over time. .

FIG. 13 shows a seventh embodiment of the gasket of the present invention.
The gasket main body 110 of this embodiment is provided so that the seal member shown in FIG. The seal member 111 is provided with a notch 112 at the position of the bolt hole 35 at the reference position, and can be peeled from the gasket body 110 in a state where the portions where the bolt holes 30 to 32 other than the bolt hole 35 are shielded. Provided. Thereby, after sticking the seal member 111, when using the gasket body 110, the bolt 6 can be inserted through the flange surface 20 while accurately aligning the notch 112 with the bolt hole 35 at the reference position. Thereafter, if the seal member 111 is peeled off, the bolt 6 can be inserted into the bolt holes 30 to 32 other than the bolt hole 35 at the reference position. The shape of the notch 112 may be a shape in which the bolt hole 35 at the reference position is opened as in the case described above.

  Further, as shown in the eighth embodiment of the gasket of the present invention shown in FIGS. 14A and 14B, the sealing member 111 shown in FIG. The sealing member 121 may be divided into two at the position of the hole 35. In this case, the same function as the seal member 100 of FIG. 12 can be exhibited. When the seal member 121 is used, the gasket body 110 may be coated in the same manner as described above, and the adhesiveness of the seal member 121 may be set high.

FIG. 15 shows a ninth embodiment of the gasket of the present invention.
In this embodiment, with respect to the gasket main body 10 of FIG. 3, an annular convex portion 130 serving as a mark is provided on the periphery of the bolt hole 35 serving as a reference position.
On the other hand, FIG. 16 shows a tenth embodiment of the gasket of the present invention. In this case, an annular recess 131 serving as a mark is provided on the periphery of the bolt hole 35 serving as a reference position.
As described above, when the annular convex portion 130 or the annular concave portion 131 is provided on the periphery of the bolt hole 35 serving as a reference, the operator can feel the bolt hole 35 by touching them visually or by hand. Can be easily recognized. In addition to the annular convex portion 130 and the annular concave portion 131, for example, a color may be applied to the periphery of the bolt hole 35 with an ink (not shown).

FIG. 17 shows an eleventh embodiment of the gasket of the present invention.
In the gasket main body 140 of this embodiment, a tag 141 which is a separate member from the gasket main body 140 and serves as a mark visible from the outside is detachably attached to the two bolt holes 35 serving as reference positions. Thus, when the tag 141 is provided in the reference | standard bolt hole 35, an operator can recognize the bolt hole 35 used as a reference | standard easily. The tag 141 is formed of a material such as paper that can be easily removed, and a notch (not shown) may be provided near the base of the tag 141. When the tag 141 is provided, it is necessary to consider the installation space for the tag 141 in advance, to prevent the tag 141 from being removed during transportation, and to prevent the bolt 6 from being inserted. The tag 141 can be easily attached by retrofitting after the gasket body 140 is molded.

FIG. 18 shows a twelfth embodiment of the gasket of the present invention.
In the gasket main body 150 of this embodiment, a tag 151 serving as a mark integrally with the gasket main body 150 is integrally formed so as to be removable in the vicinity of the two bolt holes 35 serving as reference positions. Also in this case, like the gasket main body 140 of FIG. 17, the reference bolt hole 31 can be easily recognized through the tag 151, and the tag 151 is integrally formed with the gasket main body 150, The increase in the number of points is prevented, and it is not necessary to perform the mounting work on the gasket main body 150.

  In each of the above embodiments, the gasket having two bolt holes serving as the reference position has been described. However, various modifications can be similarly made to the gasket having four bolt holes serving as the reference position.

  The bolt hole at the reference position can be recognized by a recognition means other than the above, and the bolt hole recognition means is not limited.

  Although the embodiment of the present invention has been described in detail above, the present invention is not limited to the description of the embodiment, and the scope does not depart from the spirit of the invention described in the claims of the present invention. Thus, various changes can be made.

1 Repair valve body (Piping equipment)
2 Rising pipe 3 Air valve (fire hydrant, short pipe)
DESCRIPTION OF SYMBOLS 5 Joint part 10 Gasket body 20 Flange surface 22 Annular seal surface 30, 31, 32 Bolt hole 35 Bolt hole 50, 51, 52 of reference position Handle 71 Shield part 72 Cut part 91 Seal member 92 Cut part 130 Annular convex part 131 Annular Recess 141, 142 Tag L Center line

Claims (11)

  An annular seal surface is provided on both surfaces of the substantially annular gasket body, and a plurality of bolt holes corresponding to flange surfaces of a plurality of operating pressures are provided on the outer peripheral side of the annular seal surface. gasket.   Among the bolt holes, at least two bolt holes are provided at positions serving as the reference of the gasket body, and the bolt holes are arranged at positions corresponding to the flange surfaces of a plurality of operating pressures with reference to these bolt holes. The gasket according to claim 1, which is provided.   The gasket body has a plurality of handles for suspension, and the handles are on an extension line of the center line of the gasket body, and the bolt holes are allocated corresponding to the flange surfaces of different working pressures. The gasket of Claim 1 or 2 provided in each.   The gasket according to claim 2 or 3, wherein a bolt hole other than the bolt hole serving as a reference position is covered with a thin film-like shielding portion, and a notch portion for inserting a bolt is formed in the shielding portion.   The gasket according to claim 2 or 3, wherein a shielding seal member for sealing a bolt hole other than the bolt hole serving as a reference position is attached, and a notch for inserting a bolt is formed in the seal member.   The gasket according to claim 2 or 3, wherein a shielding seal member for blocking a bolt hole other than the bolt hole serving as a reference position is attached, and the seal member is provided so as to be peelable when the bolt is inserted.   The gasket according to any one of claims 2 to 6, wherein an annular convex portion or an annular concave portion serving as a mark is provided on a peripheral edge of the bolt hole serving as a reference position.   The gasket according to any one of claims 2 to 7, wherein a tag serving as a mark made of a member different from the gasket main body is detachably attached to the bolt hole serving as a reference position.   The gasket according to any one of claims 2 to 7, wherein a tag serving as a mark integrally with the gasket main body is detachably integrally formed in the vicinity of the bolt hole serving as a reference position.   A flange joint structure in which a gasket body is attached between opposing flange surfaces of a joint part of a piping equipment, the gasket body having an annular seal surface on both sides and an outer peripheral side of the annular seal surface. A plurality of bolt holes positioned, and the bolt holes are in positions corresponding to flanges of a plurality of operating pressures, and in this state, the pipe is flange-joined via the bolt holes Flange joint structure of equipment.   The piping equipment is a repair valve. The flange joint structure for piping equipment according to claim 10, wherein the flange joint structures are joined through the gasket bodies.

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