Mortise structure with sealing gasket easy to replace and replacing method of sealing gasket in mortise structure

Abstract

The invention relates to a pipeline system sealing structure, in particular to a tongue-and-groove structure with a sealing gasket easy to replace and an operation method thereof, and aims to solve the problems that when the sealing gasket of an existing groove structure is replaced, the sealing gasket is difficult to replace, a tongue-and-groove sealing surface is easy to damage in the replacement process, and time and labor are consumed in the replacement process. The movable part with the inner side face abutting against the outer side face of the sealing gasket is arranged on the groove structural part, so that after the movable part is detached, the side face of the sealing gasket is exposed to the outside, and the sealing gasket can be easily detached; in addition, a tenon on the tenon structural part can be arranged to be in a step shape, so that after the tenon structural part and the groove structural part are disassembled, one side of the sealing gasket is always exposed outside, and the sealing gasket can be easily disassembled.

Description

TECHNICAL FIELD

[0001] The present application relates to a pipe system sealing structure, in particular to a tenon and groove structure with replaceable sealing gasket and a method for replacing the sealing gasket. BACKGROUND

[0002] The tenon and groove structure is a widely used sealing structure in pipe systems or equipment, which realizes sealing by pressing the sealing gasket in the groove and tenon. When the tenon and groove structure is used for a period of time or disassembled and reassembled, the sealing gasket needs to be replaced to achieve continuous sealing. When replacing the sealing gasket, the old sealing gasket needs to be removed first, and then the new sealing gasket is installed. However, the existing tenon and groove structure has the following disadvantages when replacing the sealing gasket: 1) For the old sealing gasket, especially the metal sealing gasket used in the tenon and groove structure of high-pressure pipe or equipment, it is often pressed and filled in the inner cavity of the groove, making it extremely difficult to remove the old sealing gasket from the groove; 2) The old sealing gasket is often removed by picking, lifting, carving or lathe turning, which can easily scratch the sealing surface of the groove during the removal process, causing damage to the tenon and groove structure; 3) The removal process of the old sealing gasket is time-consuming and labor-intensive, resulting in low work efficiency. SUMMARY

[0003] The main purpose of the present application is to solve the problems of the existing groove structure when replacing the sealing gasket, such as difficult replacement of the sealing gasket, damage to the sealing surface of the tenon and groove during the replacement process, and time-consuming and labor-intensive replacement process, and to provide a tenon and groove structure with replaceable sealing gasket and a method for replacing the sealing gasket.

[0004] To achieve the above-mentioned purpose of the application, the present application provides the following technical solutions: A tenon and groove structure with replaceable sealing gasket is arranged on the flange plate when two pipes are connected, and is used for pipe connection; the structure includes a groove structure arranged on one side of the pipe flange plate, a tenon structure arranged on the other side of the pipe flange plate, and a ring-shaped sealing gasket arranged between the groove structure and the tenon structure; the special feature is that: An axially protruding ring-shaped positioning boss is arranged on one side of the groove structure, and the ring-shaped positioning boss is coaxially arranged with the pipe flange plate; a main groove extending in the axial direction is formed on one side of the ring-shaped positioning boss in the circumferential direction, and a side groove extending in the axial direction is formed on one side of the main groove in the circumferential direction, and the depth of the side groove is greater than the depth of the main groove; A movable part is fixedly connected to the ring-shaped positioning boss of the groove structure by a plurality of connecting parts; The movable part is a ring structure, comprising an inner ring plate and a ring-shaped mounting plate arranged integrally and extending along the axial direction and the radial direction respectively; one end of the inner ring plate is connected to one side of the ring-shaped mounting plate, and the height of the inner ring plate is less than or equal to the depth of the side groove and greater than the depth of the main groove; the inner ring plate is located in the side groove, and the ring-shaped mounting plate is located on the ring-shaped positioning boss of the groove structure part; The ring-shaped sealing gasket is arranged in the main groove, and one side of the ring-shaped sealing gasket abuts against one side of the inner ring plate; an axially protruding ring-shaped tenon is arranged on one side end face of the tenon structure part, the ring-shaped tenon is coaxially arranged with the pipeline flange plate and is inserted into the main groove, and the ring-shaped sealing gasket is pressed in the main groove.

[0005] Further, the plurality of connecting parts are all countersunk screws; A plurality of circumferentially distributed counterbores are arranged on the ring-shaped mounting plate, and an axially extending screw mounting hole is arranged on the ring-shaped positioning boss of the groove structure part at a position corresponding to each counterbore; each countersunk screw is arranged in the corresponding counterbore and screw mounting hole; Each screw mounting hole comprises a dimple hole and a threaded hole arranged in sequence from the outside to the inside along the axial direction.

[0006] Further, the bottom surface of the main groove is defined as the main groove bottom surface, and a chamfer I is arranged at the intersection between the inner side surface of the side groove and the main groove bottom surface, and the chamfer I has a chamfer radius r≤0.2mm; The surface of the groove structure part abutting against the ring-shaped mounting plate is defined as the positioning surface I, and the surface of the ring-shaped mounting plate abutting against the groove structure part is defined as the positioning surface II; a chamfer II is arranged at the intersection between the positioning surface I and the outer side surface of the side groove, and the chamfer II is an annular 45° chamfer; a chamfer is arranged at the intersection between the positioning surface II and the side surface of the inner ring plate, and the radius of the chamfer is less than or equal to the side length of the chamfer II.

[0007] Further, the thickness of the ring-shaped sealing gasket before compression is defined as T1, and the depth of the main groove is greater than T1; The distance between the positioning surface I and the main groove bottom surface is defined as L1, and L1≥T1; The lower end surface of the inner ring plate is defined as the inner ring plate bottom surface, the distance between the positioning surface II and the inner ring plate bottom surface is defined as L2, and L2-L1≥2mm; The bottom surface of the side groove is defined as the side groove bottom surface, the distance between the positioning surface I and the side groove bottom surface is defined as L3, and L3-L2≥2mm.

[0008] The application also provides a method for replacing the sealing gasket in the tenon-groove structure with an easily replaceable sealing gasket, which uses the above-mentioned tenon-groove structure with an easily replaceable sealing gasket, and has the following special features: Step 1, the tenon structure part is removed; Step 2, the plurality of connecting parts are removed, and the movable plate is removed; Step 3: Remove the annular sealing gasket from the main groove; Step 4: Reinstall the movable plate back onto the slot structure using multiple connectors; Step 5: Insert the new annular sealing gasket into the main groove; Step 6: Install the tenon structure back onto the groove structure, so that the ring tenon presses the annular sealing gasket tightly into the main groove, thus completing the gasket replacement.

[0009] Meanwhile, this invention also provides another tongue and groove structure for easy-to-replace sealing gaskets, which is set on the flange when two pipelines are connected, for pipeline connection; it includes a groove structure set on one side of the pipeline flange, a tenon structure set on the other side of the pipeline flange, and an annular sealing gasket set between the groove structure and the tenon structure; its special feature is: The groove structure has an axially extending main groove on one end face along the circumference; the tenon structure has an axially protruding annular tenon on its outer wall, and both the main groove and the annular tenon are coaxially arranged with the flange. The ring tenon has a stepped structure, which is divided into a first stepped segment and a second stepped segment in the radial direction, and the height of the first stepped segment is greater than the height of the second stepped segment. The annular tenon is inserted into the main groove, pressing the annular sealing gasket between the second step and the main groove.

[0010] Furthermore, defining the thickness of the annular sealing gasket before compression as T1, and the depth of the main groove as D, then T1 <D; Let T2 be the thickness of the annular sealing gasket after compression, and L4 be the height difference between the first and second stepped sections. Then, L4 < T2.

[0011] Furthermore, if we define the height of the first step as L5, then L5≥D≥2mm.

[0012] Furthermore, the first step is located on the side closer to the outer side of the main channel, or on the side closer to the inner side of the main channel.

[0013] Meanwhile, the present invention also provides another method for replacing the gasket in a tenon-groove structure with an easily replaceable gasket. The method using the above-mentioned tenon-groove structure with an easily replaceable gasket is characterized by including the following steps: Step 1: Remove the groove structure components; Step 2: If the annular sealing gasket is located on the second step, remove the annular sealing gasket from the second step; if the annular sealing gasket is located in the main groove, remove the annular sealing gasket from the main groove. Step 3: Install the new annular sealing gasket onto the second step. Step 4: Install the tenon structure with the new annular sealing gasket back onto the groove structure, so that the second step section presses the new annular sealing gasket tightly into the main groove, thus completing the gasket replacement.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention provides a tenon and groove structure for easy replacement of sealing gaskets. A detachable movable plate is provided on one side of the groove. When the sealing gasket needs to be replaced, simply remove the movable plate to expose the side of the sealing gasket, and the sealing gasket can be easily removed. The entire disassembly process is greatly simplified, the disassembly and assembly efficiency is improved, and the sealing surface of the tenon and groove will not be damaged.

[0015] 2. Another mortise and tenon structure for easy-to-replace sealing gaskets provided by the present invention has a mortise step surface on the top surface of the mortise. During the mortise and tenon sealing process, the sealing gasket is separated from one side wall of the groove. After disassembling the mortise structure and the groove structure, one side of the sealing gasket is always exposed, so the sealing gasket can be easily removed. This simplifies the disassembly process, improves disassembly and assembly efficiency, and does not damage the mortise and tenon sealing surface. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural schematic diagram of a first embodiment of the tongue and groove structure for easily replaceable sealing gaskets of the present invention. Figure 2 This is a cross-sectional view of the groove structure component in Embodiment 1 of the easily replaceable sealing gasket of the present invention. Figure 3 This is a cross-sectional view of the movable part in Embodiment 1 of the mortise and tenon structure for easily replaceable sealing gaskets of the present invention. Figure 4 This is a cross-sectional structural schematic diagram of a second embodiment of the tongue and groove structure for easily replaceable sealing gaskets of the present invention. Figure 5 This is a cross-sectional view of the tenon structure in Embodiment 2 of the easily replaceable sealing gasket of the present invention. Explanation of reference numerals in the attached figures: 1-Slot structure component, 11-Main slot, 12-Side slot, 13-Positioning surface I, 14-Counterhole, 15-Threaded hole, 16-Chamfer I, 17-Chamfer II, 18-Bottom surface of main slot, 19-Bottom surface of side slot; 2-Tenon structural component, 21-Ring tenon, 22-First step segment, 23-Second step segment, 24-Tenon bottom surface; 3-Moving part, 31-Inner ring plate, 32-Annular mounting plate, 33-Counterhole, 34-Rounding, 35-Bottom surface of inner ring plate, 36-Positioning surface II; 4-Counterhead screws; 5- Annular sealing gasket. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0018] Example 1 A tongue and groove structure for easy-to-replace gaskets is installed on the flange when two pipes are connected, for pipe connection. Its cross-sectional structure is as follows: Figure 1 As shown, it includes a groove structure 1 installed on one side of the pipeline flange, a tenon structure 2 installed on the other side of the pipeline flange, and an annular sealing gasket 5 installed between the groove structure 1 and the tenon structure 2; the flanges on both sides of the pipeline are fixedly connected by multiple bolts. The cross-sectional structure of the groove structure 1 is as follows Figure 2 As shown, an axially protruding annular positioning boss is provided on one end face, and the annular positioning boss is coaxially arranged with the pipeline flange on one side; an axially extending main groove 11 is provided on the outer side of the annular positioning boss along the circumferential direction, and an axially extending side groove 12 is provided on the outer side of the main groove 11 along the circumferential direction, and the depth of the side groove 12 is greater than the depth of the main groove 11. The annular positioning boss of the groove structure 1 is fixedly connected to a movable part 3 by multiple circumferentially distributed countersunk screws 4; the movable part 3 is an annular structure, such as... Figure 3 As shown, the device includes an integrally formed inner ring plate 31 extending axially and an annular mounting plate 32 extending radially. In this embodiment, the outer diameter of the inner ring plate 31 is smaller than the outer diameter of the annular mounting plate 32. One end of the inner ring plate 31 is connected to one side of the annular mounting plate 32, and the height of the inner ring plate 31 is less than or equal to the depth of the side groove 12 and greater than the depth of the main groove 11. The inner ring plate 31 is located in the side groove 12, and the annular mounting plate 32 is located on the annular positioning boss of the groove structure 1. The annular mounting plate 32 is provided with a plurality of circumferentially distributed countersunk holes 33. On the annular positioning boss of the groove structure 1, countersunk holes 14 and threaded holes 15 are sequentially provided axially from the outside to the inside at the positions corresponding to each countersunk hole 33. Each countersunk screw 4 is installed in the corresponding countersunk hole 33, countersunk hole 14 and threaded hole 15, thereby fixing the movable part 3 to one side end face of the groove structure 1. An annular sealing gasket 5 is disposed in the main groove 11. In this embodiment, the outer side of the annular sealing gasket 5 abuts against the inner side of the inner ring plate 31. An axially protruding annular tenon 21 is provided on one end face of the tenon structure 2. The annular tenon 21 is coaxially disposed with the pipeline flange and inserted into the main groove 11 to press the annular sealing gasket 5 into the main groove 11. Specifically, the bottom surface of the main groove 11 is defined as the main groove bottom surface 18, and a chamfer I 16 is processed at the intersection of the inner side surface of the side groove 12 and the main groove bottom surface 18, with a rounding radius r = 0.2 mm. Define the side of the groove structure 1 that abuts against the annular mounting plate 32 as positioning surface I 13, and the side of the annular mounting plate 32 that abuts against the groove structure 1 as positioning surface II 36; then, a chamfer II 17 is machined at the intersection of positioning surface I 13 and the side of the side groove 12, and chamfer II 17 is an annular 45° chamfer; a rounded end 34 is machined at the intersection of positioning surface II 36 and the side of the inner ring plate 31, and the radius of the rounded end 34 is equal to the side length of chamfer II 17; Let T1 be the thickness of the annular sealing gasket 5 before compression, then the depth of the main groove 11 is greater than T1; let L1 be the distance between the positioning surface I 13 and the bottom surface 18 of the main groove, then L1 ≥ T1; let L2 be the distance between the lower end surface of the inner ring plate 31 and the bottom surface 35 of the inner ring plate, then L2 - L1 = 2mm; let L3 be the distance between the positioning surface I 13 and the bottom surface 19 of the side groove 12, then L3 - L2 = 2mm.

[0019] This embodiment also includes a method for replacing the gasket in a tongue and groove structure with an easily replaceable gasket, comprising the following steps: Step 1: Remove the multiple bolts connecting the pipe flanges, separate the flanges on both sides of the pipe, and remove the tenon joint 2. Step 2: Remove multiple connectors and detach the movable plate 3; Step 3: Remove the annular sealing gasket 5 from the main groove 11; Step 4: Reinstall the movable plate 3 back onto the slot structure 1 using multiple connectors; Step 5: Insert the new annular sealing gasket 5 into the main groove 11; Step 6: Install the tenon structure 2 back onto the groove structure 1, so that the annular tenon 21 presses the annular sealing gasket 5 into the main groove 11, thus completing the gasket replacement and achieving sealing of pipelines or equipment with diameters of 2mm to 2000mm and pressures of 0 to 69MPa.

[0020] Example 2 A tongue and groove structure for easy-to-replace sealing gaskets, the cross-sectional structure of which is as follows: Figure 4 As shown, it is installed on the flange when two pipelines are connected for pipeline connection; it includes a groove structure 1 installed on one side of the pipeline flange, a tenon structure 2 installed on the other side of the pipeline flange, and an annular sealing gasket 5 installed between the groove structure 1 and the tenon structure 2; the flanges on both sides of the pipeline are fixedly connected by multiple bolts. A main groove 11 extending axially is provided on one end face of the groove structure 1 along the circumferential direction; an axially protruding annular tenon 21 is provided on the outer wall of the tenon structure 2, and both the main groove 11 and the annular tenon 21 are coaxially arranged with the flange. The ring tenon 21 has a stepped structure, divided radially into a first stepped segment 22 and a second stepped segment 23, with the height of the first stepped segment 22 being greater than the height of the second stepped segment 23; for example Figure 5 As shown, the first step 22 is located on the side close to the outer side of the main channel 11; The annular tenon 21 is inserted into the main groove 11, pressing the annular sealing gasket 5 between the second step 23 and the main groove 11; Specifically, let T1 be the thickness of the annular seal 5 before compression, and D be the depth of the main groove 11. Then T1 < D, and the fit clearance between the groove structure 1 and the tenon structure 2 is 0.1mm to 2mm. Let T2 be the thickness of the annular sealing gasket 5 after compression, and L4 be the height difference between the first step 22 and the second step 23. Then L4 < T2. Let L5 be the height of the first step 22. Then L5 ≥ D ≥ 2mm.

[0021] This embodiment also includes a method for replacing the gasket in a tongue and groove structure with an easily replaceable gasket, comprising the following steps: Step 1: Remove the multiple bolts connecting the pipe flanges, separate the flanges on both sides of the pipe, and remove the groove structure 1. Step 2: If the annular sealing gasket 5 is located on the second step 23 at this time, remove the annular sealing gasket 5 from the second step 23; if the annular sealing gasket 5 is located in the main groove 11 at this time, remove the annular sealing gasket 5 from the main groove 11. Step 3: Install the new annular sealing gasket 5 onto the second step section 23; Step 4: Put the tenon structure 2 with the new annular sealing gasket 5 back onto the groove structure 1, so that the second step section 23 presses the new annular sealing gasket 5 into the main groove 11, completing the gasket replacement and achieving sealing of pipelines or equipment with diameters of 2mm to 2000mm and pressures of 0 to 69MPa.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. For those skilled in the art, modifications can be made to the specific technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions protected by the present invention.

Claims

1. A tongue and groove structure for easy-to-replace sealing gaskets, provided on a flange for connecting two pipelines; comprising a groove structure (1) provided on one side of the pipeline flange, a tenon structure (2) provided on the other side of the pipeline flange, and an annular sealing gasket (5) provided between the groove structure (1) and the tenon structure (2); characterized in that: The groove structure (1) has an axially protruding annular positioning boss on one end face, and the annular positioning boss is coaxially arranged with the pipeline flange on one side; an axially extending main groove (11) is opened on one side of the annular positioning boss along the circumferential direction, and an axially extending side groove (12) is opened on the side of the main groove (11) connected to the annular positioning boss along the circumferential direction, and the depth of the side groove (12) is greater than the depth of the main groove (11). The annular positioning boss of the groove structure (1) is fixedly connected to a movable part (3) by multiple connectors. The movable component (3) is a ring structure, including an inner ring plate (31) extending axially and an annular mounting plate (32) extending radially, which are integrally formed; one end of the inner ring plate (31) is connected to one side of the annular mounting plate (32), and the height of the inner ring plate (31) is less than or equal to the depth of the side groove (12) and greater than the depth of the main groove (11); the inner ring plate (31) is located in the side groove (12), and the annular mounting plate (32) is located on the annular positioning boss of the groove structure component (1); The annular sealing gasket (5) is set in the main groove (11), and one side of the annular sealing gasket (5) abuts against one side of the inner ring plate (31); an axially protruding annular tenon (21) is provided on one end face of the tenon structure (2), the annular tenon (21) is coaxially set with the pipeline flange and inserted into the main groove (11) to press the annular sealing gasket (5) into the main groove (11).

2. The tenon and groove structure for easy-to-replace sealing gaskets according to claim 1, characterized in that: All of the aforementioned connectors are countersunk screws (4); The annular mounting plate (32) has multiple countersunk holes (33) evenly distributed in the circumference. The annular positioning boss of the groove structure (1) has axially extending screw mounting holes at the positions corresponding to each countersunk hole (33). Each countersunk screw (4) is installed in the countersunk hole (33) and screw mounting hole corresponding to the position. Each of the screw mounting holes includes a countersunk hole (14) and a threaded hole (15) sequentially opened from the outside to the inside along the axial direction.

3. The tenon and groove structure for easy-to-replace sealing gaskets according to claim 2, characterized in that: The bottom surface of the main groove (11) is defined as the bottom surface (18) of the main groove. The side surface of the side groove (12) and the bottom surface (18) of the main groove are machined with a chamfer I (16). The radius of the chamfer I (16) is r≤0.2mm. Define the side of the groove structure (1) that abuts against the annular mounting plate (32) as positioning surface I (13), and the side of the annular mounting plate (32) that abuts against the groove structure (1) as positioning surface II (36); then the intersection of positioning surface I (13) and the side of the side groove (12) is machined with chamfer II (17), and chamfer II (17) is an annular 45° chamfer; the intersection of positioning surface II (36) and the side of the inner ring plate (31) is machined with rounded corner (34), and the radius of rounded corner (34) is less than or equal to the side length of chamfer II (17).

4. The tenon and groove structure for easy-to-replace sealing gaskets according to claim 3, characterized in that: If the thickness of the annular sealing gasket (5) before compression is defined as T1, then the depth of the main groove (11) is greater than T1; Define the distance between the positioning surface I (13) and the bottom surface of the main groove (18) as L1, then L1≥T1; Define the lower end face of the inner ring plate (31) as the bottom surface (35) of the inner ring plate, and the distance between the positioning surface II (36) and the bottom surface (35) of the inner ring plate as L2, then L2-L1≥2mm; Define the bottom surface of the side groove (12) as the bottom surface of the side groove (19), and the distance between the positioning surface I (13) and the bottom surface of the side groove (19) as L3, then L3-L2≥2mm.

5. A method for replacing the gasket in a tenon-and-groove structure with an easily replaceable gasket, based on the tenon-and-groove structure with an easily replaceable gasket as described in any one of claims 1-4, characterized in that, Includes the following steps: Step 1: Remove the tenon structure (2); Step 2: Remove multiple connectors and detach the movable plate (3); Step 3: Remove the annular sealing gasket (5) from the main groove (11); Step 4: Reinstall the movable plate (3) back onto the slot structure (1) using multiple connectors; Step 5: Insert the new annular sealing gasket (5) into the main groove (11); Step 6: Put the tenon structure (2) back onto the groove structure (1) so that the ring tenon (21) presses the annular sealing gasket (5) into the main groove (11) to complete the replacement of the sealing gasket.

6. A tongue and groove structure for easy-to-replace sealing gaskets, provided on a flange for connecting two pipelines; comprising a groove structure (1) provided on one side of the pipeline flange, a tenon structure (2) provided on the other side of the pipeline flange, and an annular sealing gasket (5) provided between the groove structure (1) and the tenon structure (2); characterized in that: The groove structure (1) has an axially extending main groove (11) on one side end face; the tenon structure (2) has an axially protruding annular tenon (21) on its outer wall, and the main groove (11) and the annular tenon (21) are both coaxially arranged with the flange. The ring tenon (21) has a stepped structure, which is divided into a first stepped section (22) and a second stepped section (23) in the radial direction, and the height of the first stepped section (22) is greater than the height of the second stepped section (23); The annular tenon (21) is inserted into the main groove (11) to press the annular sealing gasket (5) between the second step section (23) and the main groove (11).

7. The tenon and groove structure for easy-to-replace sealing gaskets according to claim 6, characterized in that: Let T1 be the thickness of the annular sealing gasket (5) before compression, and D be the depth of the main groove (11). Then T1 < D. Define the thickness of the annular sealing gasket (5) after compression as T2, and the height difference between the first step segment (22) and the second step segment (23) as L4, then L4 < T2.

8. The tenon and groove structure for easy-to-replace sealing gaskets according to claim 7, characterized in that: Define the height of the first step (22) as L5, then L5≥D≥2mm.

9. The tenon and groove structure for easily replaceable sealing gaskets according to any one of claims 6-8, characterized in that: The first step segment (22) is located on the side close to the outer side of the main groove (11) or on the side close to the inner side of the main groove (11).

10. A method for replacing the gasket in a tenon-and-groove structure with an easily replaceable gasket, based on the tenon-and-groove structure with an easily replaceable gasket as described in any one of claims 6-9, characterized in that... Includes the following steps: Step 1: Remove the groove structure component (1); Step 2: If the annular sealing gasket (5) is located on the second step (23) at this time, remove the annular sealing gasket (5) from the second step (23); if the annular sealing gasket (5) is located in the main groove (11) at this time, remove the annular sealing gasket (5) from the main groove (11). Step 3: Install the new annular sealing gasket (5) onto the second step section (23); Step 4: Put the tenon structure (2) with the new annular sealing gasket (5) back onto the groove structure (1), so that the second step section (23) presses the new annular sealing gasket (5) into the main groove (11) to complete the gasket replacement.

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