JP2017166677A - Gasket and flange connection structure of piping material using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gasket capable of being used even in a case of connecting a flange of a different flange surface, and preventing partial fastening to exhibit high sealability, and a flange connection structure of a piping material using the gasket.SOLUTION: A substantially annular core grid 30 is coated with a coating part 31, and an annular seal surface 32 is formed on both surfaces. The annular seal surface 32 enables contact seal to all flange surfaces 20, 21, 22 of a plane seat-shaped flange, whole surface seal-shaped flange and groove-shaped flange, and can be used in all the flanges.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a gasket used for joining piping equipment such as a valve, a straight pipe, a deformed pipe, or a faucet, and a flange joint structure using the gasket.

Conventionally, when piping equipment such as valves and faucets are joined by flange joints, rubber-made annular sealing gaskets are generally mounted between the joint surfaces of the flanges. As the flange surface on which this gasket is mounted, the RF type (Raised Face) is widely used. When this RF type flange joint is pipe-joined, in the standard such as JIS G 5527, the RF type The RF type-RF type for joining the flange and the RF type-GF type for joining the RF type and the GF type (Grooved Face) are defined. These are usually properly used depending on the working pressure (nominal pressure), and the RF type-RF type is used at a relatively low pressure, and the RF type-GF type having higher water tightness is used at a high pressure.
Furthermore, as a flange having a flange surface other than the RF type and the GF type, an FF type (Flat Face) is often used. In this case, the FF type flange surfaces are FF type-FF type, etc. Are joined together.

  The seal gasket used differs depending on the difference in the shape of the flange surface. When the flange surface of the RF type-RF type or FF type-FF type is joined, the RF type gasket is a flat packing. In the case of RF type-GF type, a round GF type gasket is usually used. In the case of the RF type-RF type and the FF type-FF type, a ring gasket that can be attached to the inside of the flange fixing bolt, or a full surface gasket that can be positioned and fixed by a flange fixing bolt through a bolt hole is also used.

  On the other hand, as this type of flange connection gasket, for example, a packing disclosed in Patent Document 1 is disclosed. The packing has an annular protrusion formed on one of the pressure receiving surfaces of the annular elastic body, and the annular protrusion is provided so as to be fitted in an annular groove formed on the flange seat surface. In this case, by fitting the annular protrusion into the annular concave groove, it becomes possible to mount it on the flange while temporarily fixing it, and after the flange is tightened and connected, the annular protrusion is fitted and compressed to the outside by water pressure. It is supposed that the slipping out is prevented.

Japanese Utility Model Publication No. 58-79167

As mentioned above, when joining flange joints, different types of gaskets are required for joining flange surfaces of RF type-RF type, RF type-GF type, or FF type due to the difference in flange surface, It cannot be used as a gasket.
Even if an attempt is made to use a GF type gasket for the RF type-RF type flange joint or the FF type flange joint, the GF type gasket is a round shape. Cannot be attached to FF type flange. On the other hand, even if an RF type gasket or an FF type gasket is to be used for an RF type-GF type flange joint, it becomes difficult to install it in a state where it is positioned in the groove on the seal surface. May not be secure.
For these reasons, it is necessary to prepare various types of gaskets in advance by combining the flange surfaces of the flanges to be joined, resulting in an increase in gasket inventory, and poor construction due to incorrect selection of gaskets during construction. May happen. In addition, when the gasket is tightened, if the bolts are not evenly tightened, that is, a so-called one-side tightening state, it is difficult to maintain the sealing performance.
Since the packing of Patent Document 1 has a shape in which an annular protrusion is provided on one side, it is difficult to use for bonding RF type-RF type or FF type, and this packing is also used for these bondings. I can't.

  The present invention has been developed in order to solve the above-described problems, and the object of the present invention is to be used for joining flanges of different flange surfaces, and to achieve high sealing performance by preventing one-sided tightening. It is to provide a flange joint structure for a gasket and a piping equipment using the gasket that can be exhibited.

  In order to achieve the above object, according to a first aspect of the present invention, a substantially annular cored bar is covered with a covering portion to form an annular seal surface on both sides, and the annular seal surface is a flat seat flange, a full seat flange. The gasket is provided so as to be able to contact and seal any flange surface of the groove-shaped flange.

In the invention according to claim 2, an annular seal surface and an annular protrusion protruding from the annular seal surface are provided on both surfaces of the gasket body, and the annular protrusion is an inner portion of the annular groove formed on the flange surface of the grooved flange. The gasket is a fitting portion that is fitted into the annular groove while being in contact with at least one of the peripheral edge and the outer peripheral edge, and is a seal portion that is pressure-welded to the flange surface of the flat seat flange or the full face flange.
It is.

  The invention according to claim 3 is a gasket in which hollow portions are provided on both sides of the annular protrusion.

  In the invention according to claim 4, a plurality of groove portions are formed concentrically on the outer peripheral side with respect to the recessed portion provided on the outer peripheral side of the annular protrusion, and a plane seat flange, a full face seat flange, This is a gasket in which an annular seal portion capable of being pressed and sealed is provided on the flange surface of the groove-shaped flange.

  In the invention according to claim 5, an extending attachment portion to the flange surface is integrally provided on the outer peripheral side of the annular seal surface, and a step portion is formed between the extending attachment portion and the annular seal surface. Also, the extension mounting portion is a thin gasket.

  The invention according to claim 6 is a gasket in which the gasket main body has a substantially annular cored bar and a covering part that covers the cored bar.

  The invention which concerns on Claim 7 is a gasket by which both surfaces of the gasket main body are provided in the symmetrical shape.

  The invention according to claim 8 is a flange joint structure in which the gasket main body is joined between the flange surfaces facing each other of the joint portion of the piping equipment, and the gasket main body is covered with a substantially annular metal core. An annular seal surface and an annular protrusion projecting from the annular seal surface are provided on both sides in a state of being covered with a portion, and either or both of the annular protrusions are formed on the flange surface of the grooved flange. It is fitted into the annular groove while abutting at least one of the inner peripheral edge and the outer peripheral edge of the annular groove, or is flange-bonded in a state of being pressed and sealed to the flange surface of the flat seat flange or the full face flange. This is a flange joint structure for piping equipment.

  The invention according to claim 9 is such that the piping equipment is a repair valve, the joint portion of the repair valve on the primary side and the joint portion of the rising pipe, the joint portion on the secondary side of the repair valve and the air valve or fire hydrant, short pipe This is a flange joint structure of piping equipment in which the joint parts are joined via a gasket body.

  According to the first aspect of the present invention, the annular sealing surface is provided so as to be able to contact and seal against any one of the flat seat flange, the full seat flange, and the groove flange. It can also be used in the case of joining flange surfaces having different seats, flat seats-grooves, full seats, full seats. Even when any flange surfaces are joined to each other, they can be easily mounted, and can be fastened while preventing one-sided tightening, so that high sealing performance can be exhibited and water leakage can be surely prevented.

According to the invention which concerns on Claim 2, when attaching a gasket main body to the flange surface of a groove-shaped flange, an annular protrusion can be arrange | positioned in a predetermined position, guiding along the inner periphery and outer periphery of an annular groove. After mounting the gasket body, the flange surface can be secured while preventing the gasket body from being displaced by fitting the annular protrusion into the annular groove while abutting against the inner or outer peripheral edge of the annular groove. Joining becomes possible. For this reason, in addition to joining flange surfaces that are piped in the vertical direction, when joining flange surfaces that are piped in the horizontal direction, the gasket is attached to the groove-shaped flange by fitting the annular protrusion into the annular groove. The main body can be mounted in a centered state to ensure high sealing performance for flange joining.
When mounting the gasket body on the flange face of a flat seat flange or full face seat flange, the annular projections can be pressed against each flange face to increase the sealing performance intensively and prevent water leakage reliably. Become.

  According to the third aspect of the present invention, when the gasket main body is mounted on the flange surface of the grooved flange by providing the recessed portions on both sides of the annular protrusion, the inner periphery and the outer periphery of the annular protrusion and the annular groove. A gap due to the recessed portion is provided between the inner peripheral edge and the outer peripheral edge, and the angular protrusions can be reliably brought into contact with the annular protrusion to prevent displacement. On the other hand, when the gasket body is mounted on the flange surface of a flat seat flange or full face seat flange, the recess becomes a clearance for the annular protrusion squeezed by the flat flange surface, and the annular protrusion becomes a recess on both sides. By elastically deforming so as to escape, it is possible to avoid excessive volume compression of the annular protrusion toward the flange surface, and to maintain the elastic force over a long period of time. For this reason, it is possible to improve the sealing performance by deforming the annular protrusion without difficulty and pressing it against the flange surface.

  According to the invention which concerns on Claim 4, by carrying out the pressure seal of the annular seal part with a small contact area with respect to the flange surface of a plane seat type flange, a full face type flange, and a groove type flange, on the outer peripheral side of each flange surface The surface pressure can be locally increased to improve the sealing performance.

  According to the fifth aspect of the present invention, the step portion is provided so that the mounting portion is thinner than the annular seal surface, so that when the gasket body is mounted on the flange surface with respect to the full face seat shape, the step portion is interposed. Thus, the annular seal surface can be brought into contact with the seal surface of the flange surface, and the attachment portion side can be separated from the flange surface. As a result, the contact area between the annular seal surface and the seal surface of the flange surface is regulated, and a contact seal can be performed with a small surface area and a strong surface pressure.

  According to the invention of claim 6, by providing a cored bar inside, it becomes easy to attach the gasket body with appropriate rigidity, and this cored bar prevents the displacement of the flange and improves the seismic performance. This prevents the gasket from escaping and improves durability. Reinforcing the core bar prevents deformation of the annular protrusion to the opposite surface side, and deforms the annular protrusion along the flange surface, thereby contributing to improvement of water stoppage performance. If water leakage occurs due to deterioration or the like, retightening can be easily performed while preventing an extreme deformation of the annular seal surface or the annular protrusion with the core metal. Furthermore, if the protrusion is formed at the sealing position of the core metal, the protrusion of the cover of the gasket body is restricted by the protrusion at the time of flange joining, thereby suppressing unnecessary compression. This prevents one-side tightening at the time of fastening with bolts and nuts, and exhibits a sealing property to equalize pressure over the entire circumference.

  According to the invention of claim 7, it can be mounted on any of the flat seat flange, the full seat flange, and the groove flange without sticking to the front and back orientation of the gasket body, High sealing performance can be secured.

According to the eighth aspect of the present invention, the gasket can be mounted on any of the flange surfaces of the gasket main body having the annular seal surface provided with the annular protrusion, the flat seat flange, the full face flange, and the groove flange. The main body can also be used in the case of joining flange surfaces having different plane seats-plane seats, plane seats-grooves, full seats-full seats.
When the gasket body is mounted on the flange surface of the grooved flange, the annular protrusion can be arranged at a predetermined position while being guided along the inner and outer peripheral edges of the annular groove. After mounting the gasket body, the flange surface can be secured while preventing the gasket body from being displaced by fitting the annular protrusion into the annular groove while abutting against the inner or outer peripheral edge of the annular groove. Joining becomes possible. For this reason, in addition to joining flange surfaces that are piped in the vertical direction, when joining flange surfaces that are piped in the horizontal direction, the gasket is attached to the groove-shaped flange by fitting the annular protrusion into the annular groove. The main body can be mounted in a centered state to ensure high sealing performance for flange joining.
When mounting the gasket body on the flange surface of a flat seat flange or full face seat flange, the annular projections are pressed against each flange surface to improve the sealing performance intensively and ensure water stopping. .
In any case, the flange surface can be easily joined while mounting the gasket, and can be fastened while preventing one-sided tightening, so that high sealing performance can be exhibited and water can be surely stopped.

  According to the ninth aspect of the present invention, a repair valve having a different flange surface can be joined between the riser pipe and the air valve, the fire hydrant, or the short pipe via the gasket body, and after joining, between the joint portion with the repair valve. This repair valve can be opened and closed while preventing water 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. (A) is a top view which shows 1st Embodiment of the gasket in this invention. (B) is a front view of (a). It is a top view of a metal core. It is an expanded sectional view which shows the mounting state of the gasket of FIG. (A) is a partially expanded sectional view of a gasket. (B) is a partially expanded schematic sectional view of a gasket. It is the A section expanded sectional view of Drawing 6 (a). (A) is a principal part expanded sectional view which shows the state before flange joining of RF form-GF form. (B) is a principal part expanded sectional view which shows the state after the flange joining of (a). It is a partially expanded plan view of a gasket. (A) is a principal part expanded sectional view which shows the flange joining state of RF form-RF form. (B) is a principal part expanded sectional view which shows the flange joining state of FF type-FF type. (C) is a principal part expanded sectional view which shows the flange joining state of GF type-GF type. (A) is a partially expanded sectional view which shows 2nd Embodiment of a gasket. (B) is a partially expanded sectional view which shows 3rd Embodiment of a gasket. It is explanatory drawing which shows 4th Embodiment of a gasket. It is explanatory drawing which shows 5th Embodiment of a gasket. It is explanatory drawing which shows 6th Embodiment of a gasket. It is explanatory drawing which shows 7th Embodiment of a gasket. It is explanatory drawing which shows 8th Embodiment of a gasket.

  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. FIG. 1 shows a state where a repair valve is flange-joined via a gasket of the present invention, FIG. 3 shows a first embodiment of the gasket of the present invention, and FIG. 5 shows a mounted state of the gasket of FIG. Yes. In the case of this example, the case of the nominal diameter 75 of the pipe is shown.

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 main body 1 on the secondary side, and any one of flange surfaces 20 to 22 for tightening the gasket main body 10 having various outer diameters described later is provided on the joint portion 5. Is provided. On the other hand, the joint portion 5 is also provided on the secondary side of the riser pipe 2 and the primary side of the air valve 3, and any one of the flange surfaces 20 to 22 is also provided on the joint portion 5. 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.
Piping equipment includes valves with flange joints, straight pipes, and deformed pipes.

  The gasket body 10 is a flange face 20 of the above-described external joint portion 5, which is a flat face-type (Raised Face: RF type) flange face 20, a full-face seat-type (Flat Face: FF type) flange face 22, which will be described later, More specifically, the RF type-RF type, the RF type flange surface 20 and the GF type flange are provided so as to be attachable to a grooved surface 21 of a groove shape (grooved face: GF type). It is used for the RF type-GF type that joins the surface 21 and the FF type-FF type that joins the FF flange surfaces 22 together. These combinations are selected according to the working pressure (nominal pressure) of the fluid. Generally, the RF type-RF type is used at a working pressure of 7.5 K (for 0.75 MPa), and the RF type-GF type is used at a working pressure of 7. Used for 5K, 10K (for 1.0 MPa), 16K (for 1.6 MPa), and 20K (for 2.0 MPa). Bolt holes 11 for flange joining are formed at equal intervals on the flange surfaces 20 to 22 which are the mounting surfaces at a pitch corresponding to the operating pressure, and each flange surface is joined by a bolt nut 12 through the bolt holes 11. Is done.

  FIG. 5 shows a state in which one of the joint portions 5 is an RF-shaped flange surface 20 and the other is a GF-shaped flange surface 21, and the gasket body 10 is mounted and joined between them. The RF flange surface 20 is provided with an annular flat surface as a seal surface with the gasket body 10. On the other hand, in the GF-shaped flange surface 21, an annular groove 23 is formed at a substantially central position of the annular flat surface, and the flat surface having the annular groove 23 becomes a seal surface with the gasket body 10. The annular groove 23 can be fitted with a general GF type gasket (not shown).

  As shown in FIGS. 3, 5, 6 (a), and 6 (b), the gasket body 10 has a core metal 30 and a covering portion 31, and a metal core 30 for reinforcement is inside. The cored bar 30 is provided in a thin plate shape by being covered with a covering portion 31 made of an elastic material such as rubber.

  Both surfaces of the gasket body 10 are provided symmetrically, and an annular sealing surface 32 is provided on both surfaces of the covering portion 31. On the outer peripheral side of the annular seal surface 32, an extension mounting portion 33 for mounting to the flange surfaces 20 (and flange surfaces 22) and 21 is integrally provided, and the extension mounting portion 33 is connected to the flange surfaces 20 and 21. Mounting bolt holes 34, 35, 36 are provided at a plurality of locations. Thus, the gasket main body 10 is provided with a symmetrical shape on both sides. The annular seal surface 32 is a surface in contact with the flange surface 20.

  In FIG. 4, the core metal 30 is provided in a substantially annular shape, and a notch 37 is formed at a position where the bolt holes 34 to 36 on the outer peripheral edge of the core metal 30 are provided. The notches 37 (bolt holes 34 to 36) are arranged at equal intervals in the same pitch circle as pitch circles DP1, DP2, and DP3 described later of the bolt holes 11.

  The outer diameter DS of the metal core 30 is the outer diameter of the minimum flange surface of the RF flange surface 20 (and the FF flange surface 22) and the GF flange surface 21, which in this embodiment is a flange surface 20 having a working pressure of 1.0 MPa. , 21 with an outer diameter matching the outer diameter. The cored bar 30 can be omitted. In this case, the gasket main body is integrally formed of an elastic material (not shown).

5 and 6B, the annular seal surface 32 is provided with a larger diameter than the flange surfaces 20 and 21, whereby the gasket main body 10 is provided with the RF-type flange surface 20 (the FF-type flange surface 22). The GF-shaped flange surface 21 is provided so as to be able to come into contact with any one of the flange surfaces and can be used in combination.
A step portion 39 is formed between the extension attachment portion 33 and the annular seal surface 32, and the extension attachment portion 33 is provided thinner than the annular seal surface 32 via the step portion 39.

  On both surfaces of the gasket body 10, annular protrusions 40 are provided concentrically so as to protrude from the annular seal surfaces 32, 32. The annular protrusion 40 has a substantially triangular cross section, and is fitted into the annular groove 23 while abutting at least one of the inner peripheral edge 23a and the outer peripheral edge 23b of the annular groove 23 of the GF flange surface 21. It is a part. In the present embodiment, it is provided so as to be fitted into the annular groove 23 while being in contact with the inner peripheral edge 23a, so that the gasket body 10 can be mounted in a positioned state when the gasket body 10 is mounted on the GF-shaped flange surface 21. Become.

  At the same time, the annular protrusion 40 serves as a seal portion that seals against the RF flange surface 20 and the FF flange surface 22 described later. Thus, when the gasket body 10 is mounted on the RF flange surface 20 and the FF flange surface 22, the sealing performance is exhibited by the flange surfaces 20 and 22 and the annular protrusion 40.

  As shown in FIG. 7, tapered surfaces 41 and 42 are provided on the inner diameter side and the outer periphery side of the annular protrusion 40, respectively, and these tapered surfaces 41 and 42 have different slopes depending on the angle α and angle β from the vertical plane. It is formed. The angle α and the angle β are in a relationship of angle α ≦ angle β, whereby the inner peripheral side taper surface 41 is provided more steeply than the outer peripheral side taper surface 42.

  In FIGS. 5 and 6A, depressions 43 and 44 are provided on both sides of the annular protrusion 40. According to the relationship of the angle α ≦ angle β of the annular protrusion 40, the recesses 43 and 44 are grooves having a narrow groove width on the inner peripheral side 43 and a wider groove part 44 on the outer peripheral side than the recess part 43. Formed in width. The annular protrusion 40 is crushed by the RF-shaped flange surface 20, and in this case, the recesses 43 and 44 become a clearance for the squeezed annular protrusion 40, and the annular protrusion 40 escapes to the recesses 43 and 44. By elastically deforming, the bulging deformation of the annular protrusion 40 toward the flange surface 20 is prevented.

A plurality of groove portions 45, 45 are formed concentrically on the surface facing the flange surfaces 20, 21 on the outer peripheral side of the recess portion 44, and a narrow annular seal portion 46 is provided between these groove portions 45. The annular seal portion 46 can be pressure-welded to the RF flange surface 20 (and the FF flange surface 22) or the GF flange surface 21 when the gasket body 10 is mounted. In the present embodiment, the number of the groove portions 45 is two, but three or more groove portions 45 may be provided.
In this case, a plurality of annular seal portions 46 are formed.

  3 and 9, the extending attachment portion 33 is configured with a plurality of different diameters according to the outer diameters of the flange surfaces 20 to 22 having a plurality of operating pressures. In this embodiment, the RF flange surface 20 (FF type) is used. The flange surface 22) is provided so as to extend in accordance with the outer diameter of the GF-shaped flange surface 21. The extension attachment portion 33 is provided at least to a position having a larger diameter than the annular seal surface 32 to the bolt holes 34 to 36, and the extension body 33 allows the gasket body 10 to be connected to the flange surface 20 via the bolt nut 12. 21 is attached.

  Bolt holes 34 to 36 are formed at a plurality of locations on the same center line in accordance with the position of the notch portion 37 of the cored bar 30 in the extending attachment portion 33, and these bolt holes 34 to 36 have a plurality of operating pressures. Depending on the pitch circle. For example, the bolt hole 34 is a pitch circle for a bolt and nut at a working pressure of 0.75 MPa, the bolt hole 35 is a pitch circle for a bolt and nut at a working pressure of 1.0 MPa, and the bolt hole 36 is a working pressure of 1.6 MPa. Each is provided by a pitch circle. Bolt holes 35 and 36 having operating pressures of 1.0 MPa and 1.6 MPa are arranged on the same center line at the same pitch angle. In these cases, eight bolt nuts 12 are used, and the operating pressure is 0.75 MPa. Are fastened and fixed by four sets of bolts and nuts 12.

  An arc-shaped ear portion 50 is formed by extending in the outer peripheral direction of the extending attachment portion 33, and the ear portion 50 is provided in a step shape according to a plurality of operating pressure differences, and an outer edge of each ear portion 50. Are matched with different flange outer diameters. Display portions 51, 52, and 53 are provided on the surface of the extending attachment portion 33 including the ear portion 50, and these display portions 51 to 53 include a plurality of operating pressure RF-shaped flange surfaces 20 (FF-shaped flange surfaces 22), It is provided at a position indicating the position of the outer diameter according to the operating pressure of the GF flange surface 21.

  In the present embodiment, the outer peripheral edge of the extending attachment portion 33 is a flange-diameter display portion 51 having a working pressure of 1.0 MPa, and the display portion 51 coincides with the flange surface having a working pressure of 1.0 MPa. A display portion 52 having a flange diameter of a working pressure of 1.6 MPa is provided at a portion of the ear portion 50 that is one step larger than the extending attachment portion 33. The display portion 52 is a flange having a working pressure of 1.6 MPa indicated by a one-dot chain line. Match the face. On the outer peripheral edge of the ear portion 50 on the diameter-expanding side with respect to the display portion 52, a display portion 53 having a flange diameter of 0.75 MPa in operating pressure is provided. Matches the flange surface. Among these, for example, the display unit 51 having a working pressure of 1.0 MPa displays a numerical value of a pressure (not shown), and the display units 53 and 52 of operating pressures of 0.75 MPa and 1.6 MPa have a numerical value of a pressure and a flange (not shown). Displayed by an arc representing the outer diameter of the surface.

  The ear portion 50 is formed at four locations on the gasket body 10, and the display portions 53 and 51 having operating pressures of 0.75 MPa, 1.0 MPa, and 1.6 MPa are formed by the ear portion 50 and a portion sandwiched between the ear portions 50. , 52 are provided at four locations in the circumferential direction.

  Further, as shown in the drawing, a knob 55 is formed extending from at least one ear 50, and the knob 55 can be picked and attached. In this embodiment, when the knob portion 55 of the gasket main body 10 is picked and hung from the horizontally piped flange surface, the bolt holes 35 and 36 at the operating pressures 10K and 16K match the position of the bolt hole 11 on the flange surface. It is like that.

In addition, in this embodiment, although the case where the gasket main body 10 respond | corresponds to the flange surface of operating pressure 0.75MPa, 1.0MPa, 1.6MPa was demonstrated, the flange surface of operating pressure 1.6MPa or more or 0.75MPa or less In this case, as in the case described above, a gasket body provided with the annular protrusion 40, the ear portion 50, and the like can be configured.
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.
The repair valve main body 1 which is the piping equipment shown in FIGS. 1 and 2 is connected to the rising pipe 2 and the air valve 3 via any one of the RF flange surface 20, the FF flange surface 22, and the GF flange surface 21. When joining in between, it joins, attaching the gasket main body 10 mentioned above between the flange surfaces of the joint part 5 which this piping equipment opposes.

  In this case, either or both of the annular protrusions 40 are fitted into the annular groove 23 while abutting at least one of the inner peripheral edge 23a or the outer peripheral edge 23b of the annular groove 23 of the GF-shaped flange surface 21. Alternatively, either or both of the annular protrusions 40 are flange-bonded in a state where they are pressure-welded and sealed to the RF-type flange surface 20 or the FF-type flange surface 22.

FIG. 5 shows a state in which the gasket body 10 is used to perform RF type-GF type flange bonding.
In this case, when the gasket body 10 is placed on the GF-shaped flange surface 21, the annular protrusion 40 is fitted into the annular groove 23 while being in contact with the inner peripheral edge 23 a of the annular groove 23. As a result, the gasket body 10 is disposed at a predetermined position on the GF flange surface 21. In addition, as shown in FIG. 7, since the tapered surface 41 on the inner peripheral side is provided steeply according to the relationship of angle α ≦ angle β, when the tapered surface 41 touches the inner peripheral edge 23a, the tapered surface in FIG. The annular protrusion 40 slides into the annular groove 23 so that 41 is guided by the inner peripheral edge 23a. Thereby, the gasket main body 10 can be easily mounted at a predetermined position on the GF-shaped flange surface 21. After the mounting, the steep tapered surface 41 is in contact with the inner peripheral edge 23a, so that the annular protrusion 40 is less likely to be displaced with respect to the annular groove 23, and the mounting state of the gasket body 10 can be maintained.
In addition, since the inner peripheral edge 23a of the annular groove 23 is a dimensional reference at this time, the flange body 10 can be mounted on the flange surface 21 in an appropriate state while centering the flange body 10 through the contact of the annular protrusion 40.

Therefore, in the case of the vertical piping shown in FIGS. 1, 2 and 5, the gasket main body 10 is easily positioned and mounted on the GF flange surface 21 generally piped downward as shown in FIG. 8 (a). In addition, since both surfaces of the gasket main body 10 are provided symmetrically, the same state can be obtained when any surface is faced down.
In this state, the bolt and nut 12 can be tightened via the bolt hole 11 and the bolt holes 34 to 36 of the extension mounting portion 33 to be flange-joined.

  At that time, even when the outer diameter of the flange surface varies depending on the type of flange surface and the operating pressure, the extension mounting portion 33 is provided in accordance with the outer diameter of each flange surface, and various extension mounting portions 33 can be used. It can be used for various flange surfaces so as to correspond to the outer diameter of the flange surface. Although not shown, in the case of horizontal piping, if the gasket body 10 is mounted while the annular protrusion 40 is fitted in the annular groove 23, positioning and mounting is performed in the same manner as in the case of vertical piping, and tightened with the bolt nut 12. Flange joining is possible.

  As shown in FIG. 8B, on the GF flange surface 21 side after the flange joining, the inner diameter side becomes the reduced diameter seal surface 21a with the annular groove 23 interposed therebetween, and the reduced diameter seal surface 21a has an annular protrusion of the gasket body 10. The inner diameter side of the portion 40 is in pressure contact and exhibits water blocking properties. Further, the outer peripheral side of the flange surface 21 with the annular groove 23 interposed therebetween is a diameter-enlarged seal surface 21b, and the outer peripheral side centering on the narrow annular seal portion 46 of the gasket body 10 is pressure-welded to the diameter-enlarged seal surface 21b. As a result, the contact area decreases and the surface pressure increases.

  For these reasons, on the GF-shaped flange surface 21 side, the annular seal surface 32 and the flange surface 21 of the gasket body 10 are tightly sealed with a small contact area between the inner peripheral side and the outer peripheral side with the annular groove 23 interposed therebetween. Improves. At this time, in particular, it is possible to reliably prevent water leakage by ensuring a high seal surface pressure with the enlarged-diameter seal surface 21b on the outer peripheral side.

On the other hand, on the RF flange surface 20 side after the flange joint, the annular protrusion 40 of the gasket body 10 compressively seals to the flange surface 20 while elastically deforming from the state of the two-dot chain line, so that these surface pressures are localized. It can be raised to improve the sealing performance. At this time, the annular protrusion 40 elastically deformed into the recesses 43 and 44 on both sides of the annular protrusion 40 escapes, so that the annular protrusion 40 is prevented from being cracked or broken, and as a result, the entire covering portion 31 is expanded. It is possible to maintain the sealing performance of the gasket body 10 by preventing the deterioration of the gasket.
Further, as in the case of the GF-shaped flange surface 21 side, the outer peripheral side centering on the annular seal portion 46 of the gasket main body 10 exerts high sealing performance by pressure-sealing with a small contact area on the enlarged-diameter seal surface 21b. .

  By providing the extending attachment portion 33 thinner than the annular seal surface 32 via the step portion 39, contact between the extension attachment portion 33 and the flange surfaces 20, 21 is prevented with the step portion 39 as a boundary. The contact area (seal area) between 32 and the flange surfaces 20 and 21 is regulated to a certain size. This small contact area can uniformly seal both surfaces of the gasket body 10 and the flange surfaces 20 and 21 with a high surface pressure, and even when the FF type flange surfaces 22 are joined together, Demonstrate the same water-stop function.

  As shown in FIG. 9, in the extending attachment portion 33 of the gasket body 10, the display portion 53 is arranged with respect to the outer periphery of the RF flange surface 20 and the GF flange surface 21 having a working pressure of 0.75 MPa indicated by a two-dot chain line. By aligning the outer peripheral edge of a certain ear portion 50, the gasket body 10 can be arranged while being aligned with the center of each flange surface 20, 21. In this state, if the gasket body 10 is sandwiched between the other flange surface 20 (21) and tightened with the bolts and nuts 12, the gasket body 10 can be flange joined while being arranged in a centered state. Therefore, even when the bolt holes 34 to 36 have a larger diameter than the bolt holes 11 and there is play, the gasket main body 10 can be prevented from being displaced.

  The same applies to the flange surfaces 20 and 21 having a working pressure of 1.0 MPa indicated by a broken line and the flange surfaces 20 and 21 having a working pressure of 1.6 MPa indicated by a one-dot chain line, and the display portions 51 and 52 of the ear portion 50 are respectively displayed. The gasket main body 10 can be arranged according to the centering state by matching with the outer circumferences of the flange surfaces 20 and 21, and the flange joint can be performed while securely sealing in this state.

The outer diameter DS of the cored bar 30 is set to an outer diameter slightly smaller than the outer diameter when the working pressure is 1.0 Ma, which is the smallest flange surface of the RF flange surface 20 and the GF flange surface 21. In any case of pressures of 0.75 MPa, 1.0 MPa, and 1.6 MPa, the core metal 30 can be joined while being sandwiched between the flange surfaces 20 (21). After the flange is joined, the annular seal surface 32 can be sealed to the flange surfaces 20 and 21 while the core metal 30 is reinforced, and the deformation of the GF flange surface 21 toward the annular groove 23 is prevented. The sealing performance by the annular sealing surface 32 with respect to the flange surfaces 20 and 21 is ensured, and an unnecessary step-shaped ear portion 50 protruding from the outer diameter of the flange surfaces 20 and 21 is cut off, so that a plurality of types of operating pressures can be obtained. Corresponds to the flange surface.
In addition to this, by cutting off the ear portion 50, it becomes easy to attach a flange heat insulating material, a flange fixing bracket, etc. (not shown).

FIG. 10 shows a flange joint of a combination other than the RF type-GF type.
In FIG. 10A, when the flange connection is performed by RF type-RF type, the above-mentioned ears 50 are aligned with the outer diameter of the RF type flange surface 20 so that they are centered through the gasket body 10. The flange surfaces 20 and 20 can be joined. After the flange connection, the annular protrusions 40 are respectively compressed by the flange surfaces 20 and 20 on both sides to increase the surface pressure on the inner peripheral side, and the surface pressure on the outer peripheral side of the flange surface 20 is increased by the annular seal portion 46. By raising, the sealing performance can be enhanced on the inner and outer peripheral sides of the flange surface 20.

  In FIG. 10 (b), when the flange is joined by the FF type-FF type, as in the RF type-RF type, the ear part 50 can be aligned with the outer diameter of the FF type flange surface 22, and the flange joint can be obtained. Later, the annular protrusion 40 and the annular seal portion 46 can increase the surface pressure against the flange surface 22 to improve the sealing performance and improve the water stop performance.

  In FIG. 10 (c), when the flange is joined by the GF-GF type, the gasket body 10 is fitted into the annular groove 23 while the annular protrusions 40 on both sides of the gasket body 10 are in contact with the inner peripheral edge 23a. It can be mounted between the GF-shaped flange surfaces 21 and 21 in a centered state. After the flange joining, the reduced diameter sealing surface 21a and the enlarged diameter sealing surface 21b on the inner and outer peripheral sides of the flange surface 21, and the inner peripheral side of the gasket body 10 and the outer peripheral side including the annular seal portion 46 are respectively pressed with a small contact area. The surface pressure can be increased by sealing.

  From the above, when the gasket main body 10 can be used together with any of the RF flange surface 20, the GF flange surface 21, and the FF flange surface 22, the gasket body 10 can be mounted, and when these are joined in different combinations. In addition, the gasket main body 10 can also be used. In any case, since both surfaces of the gasket main body 10 are symmetrical, they can be mounted without sticking to the front and back directions. Thereby, an operator can work quickly without hesitation at the time of construction, and water can be reliably stopped.

  FIG. 11 (a) shows a second embodiment of the gasket according to the present invention, and FIG. 11 (b) shows a third embodiment. In the following embodiments, the same parts as those in the above embodiments are denoted by the same reference numerals, and the description thereof is omitted.

  In FIG. 11A, the annular protrusions 61 on both surfaces of the gasket body 60 are provided so as to be fitted in contact with the outer peripheral edge 23 b of the annular groove 23 of the GF flange surface 21. 61 is provided in a cross-sectional shape symmetrical to the annular protrusion 40 described above. The gasket body 60 is particularly effective when the GF-shaped flange surface 21 is formed with the outer peripheral edge 23b of the annular groove 23 as a dimensional reference. The gasket main body 60 is centered while being positioned at the outer peripheral edge 23b. It can be installed accurately.

  In FIG. 11B, the annular protrusions 71 on both surfaces of the gasket main body 70 are provided at positions where they can be fitted while being in contact with the inner and outer peripheral sides of the annular groove 23 of the GF-shaped flange surface 21. The annular protrusion 71 is provided in a cross-sectional shape that is symmetrical in the horizontal direction of the drawing. In this case, the gasket main body 70 can be mounted while being positioned at the inner peripheral edge 23a and the outer peripheral edge 23b of the annular groove 23 and accurately centered.

  In any case, similarly to the annular protrusion 40 of FIG. 5, the tapered surfaces 41 and 42 are formed while the relationship between the angle α and the angle β shown in FIG. By providing the recessed portions 62 and 63 or recessed portions 72 and 73 as clearance allowances on the inner and outer peripheries of the annular protrusions 61 and 71, respectively, it becomes possible to seal while exhibiting the same function as the gasket body 10 of FIG. .

In FIG. 12, 4th Embodiment of the gasket of the nominal diameter 75 in this invention is shown.
In this gasket main body 80, a plurality of operating pressure pitch circles and bolt holes 81 in which bolt holes having different hole diameters and numbers of holes are stacked on the same center line are arranged in a rotationally symmetrical manner, and the operating pressure is 0.75 MPa, Bolt holes 81 corresponding to 1.0 MPa and 1.6 MPa are integrated into one set, and as shown in FIG. 12A, the outer diameters of the flange surfaces are different while forming the bolt holes 81 in one kind of pattern. It can also be used in some cases. In this case, as shown in the gasket main body 80 in FIG. 12A and the cored bar 82 provided in the gasket main body 80 shown in FIG. 12B, the pitch angles DQ1, DQ2, and DQ3 having different diameters have the same pitch angle. Bolt holes 81 and notches 83 of the cored bar 82 are formed, and can be fastened and fixed with eight sets of bolts and nuts (not shown).
As a result, the strength of the cored bar 82 can be improved with the minimum number of bolt holes 81 and notches 83, and the processing of the bolt holes 81 and notches 83 can be facilitated. In addition, it is possible to prevent an erroneous selection of the bolt hole 81 to be used.

In FIG. 13, 5th Embodiment of the gasket of the nominal diameter 75 in this invention is shown.
In the gasket main body 120, similarly to the gasket main body 80 of FIG. 12, a bolt hole 81 in which a plurality of pitch circles of operating pressure and bolt holes having different hole diameters and the number of holes are overlapped on the same center line is arranged in a rotationally symmetrical manner. This bolt hole 81 can also be used.
Furthermore, in this gasket main body 120, a plurality of knobs 121 are provided at positions where the bolt holes 81 can be aligned with the positions of the bolt holes 11 on the flange surface. When the gasket main body 120 is mounted on the horizontally piped flange surface, it is formed on the flange surface which is the mounting surface in a state where any of the plurality of knobs 121 corresponding to the operating pressure is picked and suspended. The position of the bolt hole 81 can be aligned with the bolt hole 11 corresponding to the operating pressure.
As a result, the gasket body 120 can be accurately placed on the flange surface by simply picking the appropriate knob 121 and hanging down, and can be easily attached with bolts and nuts without the wrong tightening position. High sealing performance can be achieved by preventing the 120 from being mismounted or tightened.

FIG. 14 shows a sixth embodiment of the gasket according to the present invention.
In the gasket main body 90, as shown in FIG. 14A, protrusions 92 are formed on both surfaces of the cored bar 91. As shown in FIG. The inner peripheral edge of the cored bar 91 is formed by alternately bending the front and back surfaces by bending. In this case, when the covering portion 31 is provided on the cored bar 91, the sealing performance can be ensured by forming the sealing surface by the covering portion 31 in a flat shape. By providing the protruding portion 92, the protruding portion 92 can regulate the crushing margin at the time of flange joining, and can prevent the covering portion 31 from being damaged and from being tightened at the time of construction.

FIG. 15 shows a seventh embodiment of the gasket according to the present invention.
In the gasket main body 100, as shown in FIG. 15A, ridges 102 are formed on both surfaces of the core metal 101, and the ridges 102 are formed on the core metal 101 as shown in FIG. A plurality of elongated hole-like bent portions are formed concentrically, and each bent portion is provided by being bent to the front and back sides. Also in this case, similarly to the gasket main body 90 of FIG. 14, the sealing surface of the covering portion 31 in the vicinity of the ridge portion 102 can be formed in a flat shape to ensure the sealing performance. It becomes possible to prevent the damage of the covering portion 31 and the single tightening during construction by regulating the cost.

In FIG. 16, 8th Embodiment of the gasket in this invention is shown.
In the gasket main body 110, as shown in FIG. 16A, protrusions 112 are formed on both surfaces of the core metal 111, and the protrusions 112 are formed on the core metal 111 as shown in FIG. It is provided by half-cutting on both sides. Also in this case, like the gasket main body of FIGS. 14 and 15, the flat state of the covering portion 31 in the vicinity of the protruding portion 112 is ensured, and the sealing property and the single-tightening preventing function are exhibited. In FIG. 16C, a plurality of hemispherical annular protrusions 116 are formed on both surfaces of the core metal 115 by half punching, and in this case as well, the same function as in FIG. 16B is exhibited.
As described above, the processing means and processing position of the annular protrusion are not particular, and in addition to these, an annular protrusion that can be pressure-sealed can be formed at any position on the flange surface by various processing means.

1 Repair valve body (Piping equipment)
2 Rising pipe 3 Air valve (fire hydrant, short pipe)
5 Joint portion 10 Gasket body 20 RF type (flat seat type) flange surface 21 GF type (groove shape) flange surface 22 FF type (full seat type) flange surface 23 Annular groove 30 Core metal 32 Annular seal surface 33 Elongation mounting part 39 Step part 40 Annular protrusion 43, 44 Indentation part 45 Groove part 46

Claims (9)

  A substantially annular mandrel is covered with a coating to form an annular seal surface on both sides, and this annular seal surface can be abutted and sealed against any of the flat seat flange, full seat flange, and groove flange surface. A gasket characterized in that it can be used together.   An annular seal surface and an annular protrusion protruding from the annular seal surface are provided on both surfaces of the gasket body, and the annular protrusion is at least an inner peripheral edge or an outer peripheral edge of the annular groove formed on the flange surface of the grooved flange. A gasket characterized by being a fitting portion that is fitted into an annular groove while being in contact with either one, and is a sealing portion that seals against a flange surface of a flat seat flange or a full face flange.   The gasket according to claim 2, wherein depressions are provided on both sides of the annular protrusion.   A plurality of grooves are formed concentrically on the outer peripheral side of the recess provided on the outer peripheral side of the annular protrusion, and a flat seat flange, a full face flange, or a flange surface of the groove flange is formed between the grooves. The gasket of Claim 2 or 3 provided with the annular seal part which can be pressure-contact sealed.   An extending attachment portion to the flange surface is integrally provided on the outer peripheral side of the annular seal surface, and a step portion is formed between the extending attachment portion and the annular seal surface, and the extending attachment portion is more than the annular seal surface. The gasket according to any one of claims 1 to 4, wherein is thinly provided.   The gasket according to any one of claims 2 to 5, wherein the gasket main body includes a substantially annular cored bar and a covering part that covers the cored bar.   The gasket according to any one of claims 1 to 6, wherein both surfaces of the gasket body are provided symmetrically.   A flange joint structure in which a gasket body is attached between opposing flange surfaces of a joint portion of piping equipment, and the gasket body is in a state in which a substantially annular metal core is covered with a covering portion. , An annular seal surface and an annular projection protruding from the annular seal surface are provided on both sides, and either or both of the annular projections are the inner peripheral edge of the annular groove formed on the flange surface of the groove-shaped flange or Piping equipment that is fitted into an annular groove while being in contact with at least one of the outer peripheral edges, or is flange-bonded in a state of being pressure-welded and sealed to the flange surface of a flat seat flange or a full face seat flange. Flange joint structure.   The piping equipment is a repair valve, and the joint portion on the primary side of this repair valve and the joint portion of the rising pipe, the joint portion on the secondary side of the repair valve, and the joint portion of the air valve or fire hydrant, short pipe The flange joint structure for piping equipment according to claim 8, wherein the flange joint structures are joined through the gasket bodies.

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