JP7093391B2 - Gasket fixing structure - Google Patents

Description

The present invention relates to a gasket fixing structure used for joining piping equipment such as valves, straight pipes, deformed pipes, and faucets.

Conventionally, when piping equipment such as valves and faucets are joined with flange joints, a sealing gasket for sealing a fluid of a predetermined pressure is generally installed between the joint surfaces of the flanges, and this gasket is used. 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 thereof are fastened with bolts and nuts, so that the packings are positioned inside the bolts and nuts. In the state, the sealing surface is in close contact. A gasket that is mounted and positioned inside this type of bolt is called a ring gasket and is designed to prevent fluid from leaking through it.

On the other hand, in Patent Document 2, the width of the pressure receiving surface is widened in the outer peripheral 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 fastened in a state of being arranged on substantially the entire surface between the flange surfaces and positioned by bolts and nuts via bolt holes so that the sealing property is exhibited. It has become.

Gaskets of each of these shapes are generally provided with a flat surface for sealing, for example, a flat flange (RF (Raised Face) flange) with a stepped sealing surface, or a seal. As a gasket for a flange (FF (Flat Face) flange: full counterbore) whose surface is all flat, it is sandwiched in a state of being in surface contact with each flange.

Jikkai Sho 63-62693 Jikkai Akira 58-79167 Gazette

When the above-mentioned pipes having RF flanges and FF flanges are arranged in the horizontal direction, the gaskets are mounted in an upright state between the flanges, which makes it difficult to position the gaskets and the gaskets. It becomes difficult to install while centering.

When a ring gasket as in Patent Document 1 of the former is used, the gasket is arranged inside the bolt and nut by sandwiching the flanges with each other, so that the gasket must be fastened in a state where the centers of the flange and the gasket do not match. There is. In this case, it becomes difficult to fix the gasket uniformly, and water may leak from the flange.

When the latter full-face gasket as in Patent Document 2 is used, it is possible to align the center with the flange by the bolt hole. However, in this case, since the number of bolts and nuts, the diameter of bolt holes, and the pitch circle thereof differ depending on the working pressure, it is necessary to prepare the gaskets in advance.
On the other hand, for example, if bolt holes corresponding to various pressure flanges are provided in the gasket for pipes having different nominal diameters such as a nominal diameter of 150 and a nominal diameter of 200, the number of bolt holes increases. The arrangement of the holes becomes complicated, and it is possible that the bolts and nuts are mistakenly tightened to bolt holes that are different from the bolt holes that the operator should originally use when working. In this case, the sealing property is not sufficient, which leads to the occurrence of leakage.

The present invention has been developed in order to solve the above-mentioned problems, and the purpose 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. It is an object of the present invention to provide a fixing structure of a gasket which can be mounted while being mounted and can prevent an erroneous tightening position.

In order to achieve the above object, the invention according to claim 1 is a substantially annular gasket body mounted on a flange surface facing a joint portion of piping equipment, and the gasket body is a covering portion made of an elastic material made of rubber. An annular sealing surface is formed with the core metal covered with the core metal, a stretched mounting portion is formed on the outer peripheral side of the annular sealing surface, and a plurality of bolt holes corresponding to the flange surface are arranged in this stretched mounting portion. The hole is covered with a thin rubber shielding part integrally with the covering part of the gasket body, and a notch for inserting a bolt is provided in this shielding part, and the shielding part has a function of holding the inserted state of the bolt. It is formed to a thickness, and the bolt in the inserted state is provided in the shielding part so that it can be held, and in the state where the bolt hole of the gasket body matches the bolt hole of the flange surface, the bolt hole between the flange surfaces and the bolt hole of the gasket body When inserting the bolt between the flange surfaces of the vertical pipe when inserting the bolt in the centered state by the notch, the bolt is sandwiched and held by the notch, and when inserting between the flange surfaces of the horizontal pipe, the notch is used. This is a gasket fixing structure in which the gasket body is centered on either the RF flange surface or the FF flange surface while being guided to the center of the bolt hole on the flange surface by sandwiching the bolt.

According to the invention according to claim 1, since the bolt can be inserted into the thin film portion after the bolt hole of the flange and the bolt hole of the gasket body are aligned, the alignment of the bolt hole is facilitated and the bolt is between the notched portions. By being sandwiched between the bolts and holding the position, the bolt can prevent the bolt from falling. In particular, the bolt that easily falls during vertical piping can be reliably prevented from falling off, and the gasket can be moved downward even during horizontal piping. There is no deviation.
That is, since the gasket body is provided with a shielding portion in a state where the core metal is covered with a covering portion made of an elastic material made of rubber, the rubber material of the shielding portion is prevented from escaping in an unstable state. Not only does the surface pressure increase, but when the bolt is inserted into the notch, the shielding part of the gasket body does not deform unnecessarily, so the bolt is held while being sandwiched by the shielding part of the notch. Guided by the center of the hole, the centering function is effectively demonstrated.

It is an external view which shows the state which the repair valve is flange-joined. 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 the bolt is inserted into the gasket of FIG. It is a schematic diagram which shows the state which the gasket of FIG. 4 is suspended. It is a top view which shows the 2nd Embodiment of the gasket of this invention. It is a top view which shows the state which the bolt is inserted into the gasket of FIG. It is a schematic diagram which shows the state which the gasket of FIG. 7 is suspended. It is an external view which shows the 3rd Embodiment of the gasket of this invention. (A) is a plan view of the gasket. (B) is a cross-sectional view taken along the line AA of (a). It is a top view which shows the 4th Embodiment of the gasket of this invention. It is a top view which shows the 5th Embodiment of the gasket of this invention. It is a top view which shows the 6th Embodiment of the gasket of this invention. It is a top view which shows the 7th Embodiment of the gasket of this invention. It is a top view which shows the 8th Embodiment of the gasket of this invention. It is an external view which shows the 9th Embodiment of the gasket of this invention. (A) is a plan view of the gasket. (B) is a sectional view taken along the line BB of (a). It is a top view which shows the tenth embodiment of the gasket of this invention. (A) is a plan view of the gasket. (B) is a sectional view taken along the line CC of (a). It is a top view which shows the eleventh embodiment of the gasket of this invention. It is a top view which shows the twelfth embodiment of the gasket of this invention.

Hereinafter, embodiments of the gasket and the flange joining structure of the piping equipment using the gasket in 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. In this example, the case where the nominal diameter of the pipe is 150 is shown. In this example, the dimensions of the flange corresponding to Table A.23, Table A.24, and Table A.25 of the ductile cast iron deformed pipe for water supply are set to JWWA G 114: 2015 of the Japan Water Works Church.

The repair valve shown in FIG. 1 (hereinafter referred to as repair valve main body 1) is a kind of piping equipment, and the gasket of the present invention (hereinafter referred to as gasket main body 10) has a rising pipe on the primary side of the repair valve main body 1. It is provided when joining to 2 and joining the secondary side of the repair valve main body 1 to an air valve (or a fire hydrant or a short pipe (not shown) 3). A joint portion 5 is provided on each of the primary and secondary sides of the repair valve main body 1, the joint portion 5 is composed of an annular flange portion, and the gasket main body 10 tightening described later is performed on the connection surface side of the joint portion 5. An attachment flange surface 20 is provided. On the other hand, a joint portion 5 is provided on the secondary side of the rising pipe 2 and the primary side of the air valve 3, respectively, and the flange surface 20 is also provided on the joint portion 5. The flange surface 20 in the present embodiment means a surface on which the gasket body 10 abuts and seals.

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

As shown in FIGS. 9, 15, and 16, the gasket main body 10 of FIG. 3 is formed in a substantially annular shape by being covered with a covering portion 21 made of an elastic material such as rubber from above the core metal 21a .

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

An extended mounting portion 23 for mounting on the flange surface 20 is integrally provided on the outer peripheral side of the annular sealing surface 22. The stretched mounting portion 23 is composed of a plurality of different diameters corresponding to the flange surfaces 20 having a plurality of working pressures, and in the present embodiment, the stretched mounting portion 23 is stretched according to the outer diameter of the entire surface of the RF type or FF type flange portion 5. Is formed. The stretch mounting portion 23 is provided at least in a diameter larger than the pitch circle of the bolt holes 30 to 32 described later, and the gasket main body 10 is mounted between the flange surfaces 20 by the bolt nut 6 via the stretch mounting portion 23. It is provided as a full-face gasket so that it can be used for both flange surfaces of different modes.

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

Specifically, in FIGS. 3 and 4, the bolt holes 30 are for an working pressure of 0.75 MPa (7.5 K), and are provided at six locations on the pitch DP 1 yen for the bolt nut 6. The bolt holes 31 are for a working pressure of 1.0 MPa (10K), and are provided at eight locations on the pitch circle DP2 for the bolt nut 6. The bolt holes 32 are for bolts and nuts 6 having a working pressure of 1.6 MPa (16K), and are provided at 12 locations on the pitch circle DP3. As a result, 6 sets, 8 sets, and 12 sets of bolts and nuts 6 can be tightened and fixed, respectively. FIG. 4A shows a state in which bolts and nuts 6 are inserted into each of the six bolt holes 30, and FIG. 4B shows a state in which bolts and nuts 6 are inserted into each of the eight bolt holes 31. FIG. 4C shows a state in which bolts and nuts 6 are inserted into each of the 12 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 reference positions of the gasket body 10. The other bolt holes 30 to 32 are arranged at positions corresponding to the flange surfaces 20 of the plurality of working pressures with reference to the two bolt holes 35 of the above. In this example, in the state of FIG. 3, two bolt holes 35 are provided in the gasket main body 10 at the positions indicated by hatching, and the positions of the two bolt holes 35 are common to the bolt holes 30, 31, and 32. And it becomes the overlapping position.

An arc-shaped selvage 40 is formed by stretching in the outer peripheral direction of the stretched mounting portion 23, and the selvage 40 is provided in a stepped shape according to a difference in a plurality of working pressures, and the selvages 40 are provided in a stepped shape. The outer edges are designed to match the different flange outer diameters. Flange outer diameter display portions 41, 42, and 43 are provided on the surface of the stretch mounting portion 23 including the selvage portion 40, and these flange outer diameter display portions 41 to 43 are used for the working pressure of the flange surface 20 having a plurality of working pressures. It is provided at a position indicating the position of the outer diameter according to the above.

In the present embodiment, the outer peripheral edge of the stretch mounting 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 the flange surface having a working pressure of 1.0 MPa. A flange outer diameter display portion 42 having a flange diameter of 0.75 MPa is provided in a portion of the ear portion 40 whose diameter is one step larger than that of the stretched mounting portion 23, and the flange outer diameter display portion 42 has a working pressure of 0.75 MPa. Matches the flange surface of. A flange outer diameter display unit 43 having a flange diameter of 1.6 MPa is provided on the outer peripheral edge of the ear portion 40 on the enlarged diameter side of the flange outer diameter display unit 42, and the flange outer diameter display unit 43 is used for the working pressure. It corresponds to the flange surface of 1.6 MPa.

The selvage portion 40 is formed at four points of the gasket main body 10, and the flange outer diameters of 0.75 MPa, 1.0 MPa, and 1.6 MPa are displayed by the selvage portion 40 and the portion sandwiched between the selvage portions 40. The portions 41 to 43 are provided in the circumferential direction, respectively.

Near the upper part of the gasket body 10 in FIG. 3, three handles 50, 51, and 52 for hanging are provided so as to extend from the selvage portion 40, and the gasket body is suspended by pinching each of the handles 50 to 52. It is possible to align 10 with the flange surface 20. The handles 50 to 51 are on the extension line of each center line 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 working pressures. That is, when the handles 50 to 52 are pinched on the horizontally piped flange surface 20 and the gasket body 10 is hung down, the bolt holes 30 to 32 corresponding to the respective handles 50 to 52 are formed on the flange surface 20. It is designed to fit the 26 position.

In this embodiment, the case where the gasket main body 10 corresponds to the flange surface 20 having working pressures of 0.75 MPa, 1.0 MPa, and 1.6 MPa has been described, but other pressures and standards other than JIS, JWWA, and the like have been described. In the case of the overseas standard of No. 1, the gasket main body 10 can be provided in the same manner as in the above case.
Further, although an example in which the repair valve main body 1 is used as the piping equipment has been described, it can also be used for flange joining of various piping equipment such as valves and faucets other than the repair valve main body 1.

Subsequently, the flange joining structure and operation of the 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 facing joint portion of the piping equipment 1 is joined. The gasket body 10 described above is attached and joined between the flange surfaces 20 of 5.

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

FIG. 5B shows a state when the gasket main body 10 is mounted on the flange surface 20 having a working pressure of 1.0 MPa. In this case, if the handle 51 is pinched and suspended, the two bolt holes 35 at the reference positions among the bolt holes for the working pressure of 1.0 MPa overlap with the bolt holes 26 on the flange surface 20, and the bolts are bolted. By tightening and fixing a total of eight bolt holes 31 on the pitch circle DP2 with respect to the hole 35 with bolt nuts 6, the gasket body 10 is mounted at a predetermined position, and the two flange surfaces 20 are connected to each other in a sealed state. can.

FIG. 5C shows a state when the gasket main body 10 is mounted on the flange surface 20 having an working pressure of 1.6 MPa. In this case, if the handle 52 is pinched and suspended, the two bolt holes 35 at the reference positions among the bolt holes for the working pressure of 1.6 MPa overlap with the bolt holes 26 on the flange surface 20, and the bolts are bolted. By tightening and fixing a total of 12 bolt holes 32 on the pitch circle DP3 with respect to the hole 35 with bolt nuts 6, the gasket body 10 is mounted at a predetermined position, and the two flange surfaces 20 are connected to each other in a sealed state. can.

As described above, by aligning the two bolt holes 35 of the gasket body 10 defined in advance with the bolt holes 26 of the flange surface 20 of each working pressure, all the remaining bolt holes required for tightening can be flanged. It can be easily fitted to the bolt hole 26 of the surface 20.

FIG. 6 shows a second embodiment of the gasket of the present invention. In addition, after this embodiment, the same part as the above-described embodiment is represented by the same reference numeral, and the description thereof will be omitted.
The gasket main body 60 of this embodiment is used for flange connection of a pipe having a nominal diameter of 200, and among the bolt holes 30 to 32 provided in the gasket main body 60, four places shown by cross-hatching are shown. Bolt holes 61 are provided at positions that serve as a reference for the gasket body 60, and bolt holes 30 to 32 are arranged at positions corresponding to flange surfaces 20 of a plurality of working pressures with reference to these bolt holes 61. Further, the gasket main body 60 is provided with two handles 62 and 63 for hanging.

Bolt holes 30 for a working pressure of 0.75 MPa in FIG. 7A are provided at eight locations 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 12 locations on the pitch DP2 circle for the bolt nut 6. Bolt holes 32 for bolts and nuts having a working pressure of 1.6 MPa in FIG. 7 (c) are provided at 12 locations on the pitch circle DP3. In this way, 8 sets, 12 sets, and 12 sets of bolts and nuts 6 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 of 200 that is horizontally piped. FIG. 8A shows a state in which the gasket body 60 is mounted on the flange surface 20 having 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 among the bolt holes 30 for the working pressure of 0.75 MPa overlap with the bolt holes 26 on the flange surface 20. By tightening and fixing a total of eight bolt holes 30 on the same pitch circle DP1 with respect to the bolt holes 61 with bolt nuts 6, the two flange surfaces 20 are connected to each other with the gasket body 60 mounted in a predetermined position. can.

FIG. 8B shows a state in which the gasket body 60 is mounted on the flange surface 20 having 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 positions among the bolt holes 31 for the working pressure of 1.0 MPa overlap with the bolt holes 26 on the flange surface 20. By tightening and fixing a total of 12 bolt holes 31 on the same pitch circle DP2 with respect to the bolt holes 61 with bolt nuts 6, the two flange surfaces 20 are connected to each other with the gasket body 60 mounted in a predetermined position. can.

FIG. 8C shows a state in which the gasket body 60 is mounted on the flange surface 20 having an working pressure of 1.6 MPa. In this case, as in the case of the working pressure of 1.0 MPa, if the handle 63 is pinched and suspended, the four bolt holes 61 at the reference positions among the bolt holes 32 for the working pressure of 1.6 MPa are used. Overlaps the bolt holes 26 on the flange surface 20, and the gasket body 60 is mounted in a predetermined position by tightening and fixing a total of 12 bolt holes 32 on the same pitch circle DP3 with respect to the bolt holes 61 with bolt nuts 6. The two flange surfaces 20 can be connected to each other in this state.

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

The cut portion 72 is formed by the number of cuts and the cut position so that bolt nuts 6 arranged in predetermined bolt holes according to the working pressure can be inserted into each bolt hole in a centered state. That is, when a plurality of bolt holes with working pressures are overlapped with each other, even for bolts and nuts 6 having different tightening positions at each working pressure, each bolt and nut 6 is centered and guided to a predetermined tightening position. A possible notch 72 is formed in one bolt hole.

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

The shielding portion 71 may be thickened to increase its strength, or the shape of the notch portion 72 may be adjusted. When the notch portion 72 is provided, especially in the case of vertical piping in which the bolt 6 is likely to fall. The bolt 6 inserted into the bolt hole is sandwiched by the notch 72 from below the flange surface 20 and the position is maintained, thereby exhibiting the fall prevention function of the bolt 6.

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 holes corresponding to the plurality of working pressures through the notch 72. In this way, the plurality of bolts 6 are inserted into the bolt holes 26 in a state of being arranged concentrically with respect to the center of the flange surface 20. As a result, the gasket 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, the gasket main body 70 can be aligned with the bolts 6 arranged concentrically with the center of the flange surface 20 through the bolt holes, and can be mounted in a state of being centered at the center of the flange surface 20. Such a centering function can be exerted on any of a general-purpose RF flange surface and an FF flange surface.

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

When the cut portion 72 is provided in the shielding portion 71, the number of cut portions 72 may be increased or the position where the cut portion 72 is formed may be increased according to the shape of the bolt hole that is used alone or is also used due to the difference in working pressure. It is good to change. In this case, by weakening the resistance when inserting the bolt 6, there is no possibility of obstructing the insertion of the bolt 6. On the other hand, by reducing the number of cut portions 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 advisable to clarify the difference from the bolt hole 35 in which the shielding portion 71 is not provided so as to improve the visibility.

In FIG. 9B, the shielding portion 71 is provided on the insertion side (upper side in the figure) of the bolt holes 30 to 32, but the shielding portion 71 is formed so as to be closer to the center of the bolt holes 30 to 32. (Not shown). In this case, the shielding portion 71 is positioned symmetrically with respect to the front and back surfaces of the gasket main body 70, so that the operator does not need to mount the gasket main body 70 on the flange surface 20 while checking the mounting direction.

FIG. 10 shows a fourth embodiment of the gasket of the present invention.
In the gasket main body 80 of this embodiment, reference bolt holes 35 are provided at two places, and the ears are located at positions matching the outer diameter of the working pressure of 1.6 MPa (16K) on the outer peripheral side of these bolt holes 35. A handle 81 that also functions as a selvage is provided. When used for vertical piping, by holding the handle 81 for alignment, it is possible to reliably prevent the position of the reference bolt hole 35 from being mistaken.
Further, at the lowermost position in the figure, a selvage portion 82 having an arcuate outer peripheral edge substantially the same as the outer diameter of the working pressure 16K is formed so as to project. When the gasket body 80 is attached, if the selvage 82 is aligned with the outer diameter of 16K in addition to the above two handles 81 and 81, the gasket body 80 can be accurately centered by aligning the three points on the circumference. However, the gasket body 80 can be attached.

On the outermost peripheral side of the gasket main body 80, the selvage portion 40 for working pressure 0.75 MPa (7.5 K) is formed over a wide range. In this way, by enlarging the selvage portion 40 in the range of the outer diameter portion of 7.5K, which is most frequently used, it is possible to easily align the gasket body 80 when the working pressure is 7.5K. ..

FIG. 11 is a plan view showing a fifth embodiment of the gasket of the present invention.
The gasket body 90 of this embodiment is provided with a closing seal member 91 that closes the bolt holes 30 to 32 other than the bolt hole 35 as a reference position so as to be attached, and the seal member 91 is provided with a notch for inserting a bolt. The part 92 is formed. FIG. 11A shows the seal member 91, and FIG. 11B shows the gasket body 90 to which the seal member 91 is attached.

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

Further, as shown in the sixth embodiment of the gasket of the present invention shown in FIG. 12, the sealing member 101 that can be attached to the gasket main body 100 may be divided into two at the position of the reference bolt hole 35. In this case, it becomes easier to arrange the printed seal member 101 on the divided seal member 101, and it is possible to omit the wasteless cut-out portion on the inner peripheral side as compared with the case where the annular seal member is provided. Therefore, it is possible to increase the number of sealing members 101 taken from a certain sealing material while reducing the amount of waste of the sealing material as a material and improving the yield. It becomes easier to attach to the gasket body 100, and wrinkles become more difficult.

When the above-mentioned sealing members 91 and 101 are used, it is desirable to coat the surfaces of the gasket bodies 90 and 100 with clear resin or the like in order to increase the sticking force thereof. In addition, it is necessary to maintain the adhesiveness of the sealing members 91 and 101 after they are attached or during long-term storage, and to have an adhesive strength that can prevent the adhesiveness from being peeled off due to the decrease in the adhesiveness or the decrease in the adhesiveness due to aged deterioration. ..

FIG. 13 shows a seventh embodiment of the gasket of the present invention.
The gasket body 110 of this embodiment is provided so that the seal member shown in FIG. 13A can be attached. The seal member 111 has a notch 112 provided at the position of the bolt hole 35 at the reference position, and can be peeled off from the gasket main body 110 in a state where the portion other than the bolt hole 35 where the bolt holes 30 to 32 are located is shielded. It will be provided. As a result, after the sealing member 111 is attached, when the gasket main body 110 is used, the bolt 6 can be inserted by accurately aligning the notch 112 with the bolt hole 35 at the reference position and accurately aligning with the flange surface 20. After that, 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 such that the bolt hole 35 at the reference position opens as in the above-mentioned case.

Further, as shown in the eighth embodiment of the gasket of the present invention shown in FIGS. 14 (a) and 14 (b), the seal member 111 of FIG. 13 is attached to the bolt at the reference position for attachment to the gasket main body 110. The seal member 121 may be divided into two at the position of the hole 35. In this case, the same function as that of the seal member 100 of FIG. 12 can be exhibited. When the seal member 121 is used, it is preferable to coat the gasket body 110 and set the adhesiveness of the seal member 121 to be high as in the above case.

FIG. 15 shows a ninth embodiment of the gasket of the present invention.
In this embodiment, the gasket main body 10 of FIG. 3 is provided with an annular convex portion 130 as a mark on the peripheral edge of the bolt hole 35 which is 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 as a mark is provided on the peripheral edge of the bolt hole 35 as a reference position.
As described above, when the annular convex portion 130 or the annular concave portion 131 is provided on the peripheral edge of the reference bolt hole 35, the operator feels the bolt hole 35 by visual inspection or by touching them by hand. Can be easily recognized. In addition to the annular convex portion 130 and the annular concave portion 131, the peripheral edge of the bolt hole 35 may be colored with, for example, ink (not shown).

FIG. 17 shows the eleventh embodiment of the gasket of the present invention.
In the gasket main body 140 of this embodiment, a tag 141, which is a member different from the gasket main body 140 and serves as a mark visible from the outside, is detachably attached to two bolt holes 35 serving as reference positions. When the tag 141 is provided in the reference bolt hole 35 in this way, the operator can easily recognize the reference bolt hole 35. The tag 141 may be made of an easily removable material such as paper, and a notch (not shown) may be provided near the base of the tag 141. When the tag 141 is provided, it is also necessary to consider the installation space for the tag 141 in advance, prevent the tag 141 from coming off during transportation, and prevent the insertion of the bolt 6 from being obstructed. The tag 141 can be easily attached by retrofitting after molding the gasket main body 140.

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 that serves as a mark integrally with the gasket main body 150 is detachably integrally molded in the vicinity of two bolt holes 35 that serve as reference positions. Also in this case, similarly to the gasket main body 140 of FIG. 17, the reference bolt hole 31 can be easily recognized via the tag 151, and the tag 151 is integrally molded with the gasket main body 150. It is not necessary to prevent the increase in the number of parts and to perform the mounting work on the gasket body 150.

In each of the above embodiments, the gasket having two bolt holes as reference positions has been described, but various changes can be made to the gasket having four bolt holes at reference positions as well.

Further, the bolt hole at the reference position can be recognized by a recognition means other than the above, and the bolt hole recognition means does not matter.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the description of the embodiments, and is within the scope of the invention described in the claims of the present invention. Therefore, various changes can be made.

1 Repair valve body (plumbing equipment)
2 Rising pipe 3 Air valve (fire hydrant, short pipe)
5 Joint part 10 Gasket body 20 Flange surface 22 Circular sealing surface 30, 31, 32 Bolt hole 35 Bolt hole at reference position 50, 51, 52 Handle 71 Shielding part 72 Cut part 91 Sealing member 92 Cut part 130 Circular convex part 131 Circular Recess 141, 142 Tag L Center line

Claims (1)

It is a substantially annular gasket body mounted on the flange surface facing the joint portion of the piping equipment, and the gasket body forms an annular sealing surface in a state where the core metal is covered with a covering portion made of an elastic material made of rubber. A stretched mounting portion is formed on the outer peripheral side of the annular seal surface, a plurality of bolt holes corresponding to the flange surface are arranged in the stretched mounting portion, and the bolt holes are integrated with the covering portion of the gasket body. Is covered with a thin-film rubber shielding portion, and a notch for inserting a bolt is provided in the shielding portion. The shielding portion is formed to a thickness having a function of holding the inserted state of the bolt, and the shielding portion is formed. The bolt hole in the inserted state is provided at the portion so as to be able to hold the bolt hole, and the bolt hole of the flange body is aligned with the bolt hole of the flange surface. In addition, when inserting the bolt between the flange surfaces of the vertical pipe when inserting the bolt in the centered state by the notch, the bolt is sandwiched and held by the notch and inserted between the flange surfaces of the horizontal pipe. Is such that the gasket body is centered on the flange surface of either the RF flange surface or the FF flange surface while the bolt is sandwiched between the notches and guided by the center of the bolt hole on the flange surface. The fixing structure of the flange is characterized by that.

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