PIPE FIXING SYSTEM AND PIPE FIXING METHOD

Abstract

PIPE FIXING SYSTEM AND METHOD FOR FIXING TO A PIPE A pipe fixing system (2) to the inner wall of a pipe (3) comprises a first bracket (9) having a first external shape and a second bracket (9) having a second external shape. A ring (10) separates the first and second brackets (9). The ring (10) is made of a polymer material and is elastically deformable. A compression system (11) connects the first and second brackets (9). The compression system (11) is configured to define the distance between the first and second brackets (9) and to compress the ring (10) between the first and second brackets (9). The ring (10) extends beyond the first and second external shapes to bear against the inner wall of the pipe (3) and fix the fixing system (2) to the pipe (3). Figure for the abridged version: Figure 1

Description

Title of the invention: SYSTEM FOR FIXING TO A PIPELINE AND METHOD FOR FIXING TO A PIPELINE LISTENING technical field

[0001] The invention relates to a pipe fixing system and a pipe fixing method. State of the art

[0002] It is common practice to use pipes to circulate liquids. These pipes are made functional by means of devices that are fixed to the pipe walls in such a way as to interact with the liquid. It is known to fix devices such as check valves, plugs, or cross-section reducers.

[0003] When the pipe is open and the device is to be fixed to the end of the pipe, it is known to cover the terminal part of the pipe so as to bear against the outer wall of the pipe or simultaneously on the inner wall and the outer wall of the pipe.

[0004] When the device needs to be inserted a little deeper or when the pipe stops flush with the structure, it is not possible to access the external wall. In such cases, it is common practice to cut the pipe and insert the device into the cut section by attaching it to the ends of the pipe or by working on the wall.

[0005] Such an assembly is not practical because it requires cutting the pipe or intervening on the wall. Description of the invention

[0006] An object of the invention is to overcome these drawbacks, and more particularly to provide a fixing system which is more efficient than the fixing systems of the prior art and which does not require cutting the pipe, nor taking a support on the external wall of the pipe.

[0007] These drawbacks are addressed by means of a fixing system to an internal wall of a pipe comprising: - a first armature having a first external shape and a second armature having a second external shape; - a ring made of polymer material and elastically deformable, the ring separating the first reinforcement and the second reinforcement along a longitudinal direction of the pipe; - a stiffener fixed to the first reinforcement and mounted to move relative to the second reinforcement, the stiffener being annular in shape, the ring bearing against a wall external of the stiffener; - a compression system linking the first reinforcement and the second reinforcement, the compression system being configured to define the distance between the first reinforcement and the second reinforcement and to compress the ring between the first reinforcement and the second reinforcement, the ring extending beyond the first external form and the second external form to press against the internal wall of the pipe and fix the fixing system to the pipe.

[0008] Advantageously, the compression system passes through the ring.

[0009] In a particular embodiment, the outer wall of the stiffener has a shape complementary to the shape of the inner wall of the ring.

[0010] Preferably, the first and second reinforcements are two annular reinforcements to form a fastening system that can be traversed by a fluid.

[0011] Advantageously, the first armature and the second armature are made of metal.

[0012] In a preferred embodiment, the compression system is formed by a plurality of threaded rods mounted for rotation to define the distance between the first and second reinforcement bars. In one case, the head of the threaded rod is prevented from rotating by the first or second reinforcement bar. In another case, the threaded rods are mounted in nuts prevented from rotating by the first or second reinforcement bar.

[0013] Advantageously, the ring, the first armature and the second armature have a circular external section.

[0014] Preferably, the ring is made of elastomer.

[0015] In a particular embodiment, a stiffener is mounted on one of the first and second reinforcements and mounted to rest on the inner wall of the ring, the stiffener being annular in shape, the inner wall of the ring bearing on the stiffener.

[0016] The invention also relates to a method of fixing a fixing system against the internal wall of a pipe which is simpler to implement than prior art configurations.

[0017] This result is to be achieved by means of a method for fixing a fastening system against the inner wall of a pipe comprising the following steps: - provide a fixing system according to any of the previous configurations and a conduit; - install the fixing system inside the pipe; - compress the ring using the compression system to deform the ring towards the inner wall and secure the fastening system against the canal lisation. Description of the drawings

[0018] Other advantages and features will become clearer from the following description of particular embodiments and implementations of the invention given by way of non-limiting examples and shown in the accompanying drawings, in which:

[0019] [Fig-1]: [Fig.1] schematically illustrates a perspective view of a system of fixing mounted on a non-return valve for piping according to a first embodiment, the non-return valve being in a blocking position;

[0020] [Fig.2]: [Fig.2] schematically illustrates a rear view of the fastening system mounted on a non-return valve for piping according to the first embodiment, the non-return valve being in the blocking position; [Fig.3]: [Fig.3] schematically illustrates a perspective view of a fixing system mounted on a non-return valve for a pipeline according to the first embodiment, the non-return valve being in a blocking position and mounted in a pipeline.

[0021] [Fig.4]: [Fig.4] schematically illustrates a perspective view of a system of fixing mounted on a non-return valve for pipe according to a second embodiment, the non-return valve being in a blocking position and mounted in a pipe;

[0022] [Fig. 5]: Fig. 5 schematically illustrates a longitudinal cross-sectional view of the fixing system mounted on a non-return valve for piping according to the first embodiment, the non-return valve being in the blocking position;

[0023] [Fig.6]: [Fig.6] schematically illustrates a perspective view of a system of fixing according to the first embodiment, the non-return valve being in the passing position and mounted on a non-return valve for piping;

[0024] [Fig.7]: [Fig.7] schematically illustrates a rear view of the fastening system mounted on a non-return valve for piping according to the first embodiment, the non-return valve being in the passing position;

[0025] [Fig.8]: [Fig.8] schematically illustrates a perspective view of a system of fixing mounted on a non-return valve for pipe according to the first embodiment, the non-return valve being in a through position and mounted in a pipe;

[0026] [Fig.9]: [Fig.9] schematically illustrates a perspective view of a system of fixing mounted on a non-return valve for pipe according to the second embodiment, the non-return valve being in a through position and mounted in a pipe;

[0027] [Fig. 10]: [Fig. 10] schematically illustrates a longitudinal cross-sectional view of the fixing system mounted on a non-return valve for piping according to the first embodiment, the non-return valve being in the passing position;

[0028] [Fig. 11]: [Fig. 11] schematically illustrates an exploded view of the fastening system mounted on a non-return valve according to the first embodiment;

[0029] [Fig. 12]: [Fig. 12] schematically illustrates a side view of the fixing system mounted on a non-return valve for piping according to the first embodiment, the non-return valve being in the blocking position. Detailed description

[0030] Figure 1 illustrates a check valve 1 equipped with a fastening system 2 configured to be fixed to an internal wall of a pipe 3. The check valve 1 is equipped with a diaphragm defining a gate 4 which is configured to allow the passage of fluid in the pipe 3 in a first direction of movement A. The gate 4 is configured to prevent the passage of fluid in the pipe 3 in a second direction of movement B which is opposite to the first direction of movement A. In this way, the gate 4 only allows fluid flow in one direction within the pipe 3.

[0031] The gate 4 has an inlet area with a fixed portion 4a and a movable portion 4b. The movable portion 4b is mounted to move relative to the fixed portion 4a. The movable portion 4b deforms to define a first position and a second position. In the first position, called the blocking position and illustrated in Figures 1 to 5, the movable portion 4b prevents fluid flow in the second direction of movement B. In the second position, called the passing position and illustrated in Figures 6 to 10, the movable portion 4b is deformed, allowing fluid flow in the first direction of movement A. The movable portion 4b and the fixed portion 4a ensure the sealing of the check valve 1.

[0032] The first and second directions of movement A and B correspond to the longitudinal direction of the pipeline 3.

[0033] The gate 4 is in the form of a three-dimensional structure with a cross-section decreasing from a first end to a second end. The second end is opposite the first end along the second direction of movement B. The gate 4 is in the form of a conical structure, and more preferably a frustoconical shape, as illustrated in Figures 1 to 12. The first end corresponds to the opening of the cone's mouth, i.e., the entrance of the gate 4, while the second end corresponds to the bottom of the cone.

[0034] The conical or frustoconical structure has a decreasing cross-section along the second direction of movement B. When the fluid moves in the pipe 3 along the In the second direction of movement B, the fluid enters the door 4, i.e., the cone, which generates a force on the inner wall of the membrane. This force pushes the cone wall towards the inner lateral wall of the pipe or the fixing system 2, making it more difficult for liquid to pass through the non-return valve 1.

[0035] Conversely, when the fluid moves along the first direction of movement A, it encounters the outer wall of the gate 4. The fluid exerts a force directed inwards towards the cone, which deforms the entrance of the gate 4 and creates a passage for the fluid. The fluid exerts a force on the movable portion 4b, which deforms to generate a passage.

[0036] It is particularly advantageous to provide a gate 4 with a specific shape to ensure effective blockage of the fluid when it flows in the second direction of movement B and to have the ability to deform easily when the fluid flows in the first direction of movement A. The more easily the gate 4 deforms, the lower the fluid flow rate it can allow, thus preventing fluid stagnation. This reduces the pressure losses generated by the check valve 1.

[0037] Using a cone corresponding to its mathematical definition, that is, with a plurality of circular sections that decrease linearly, does not provide a satisfactory result. The cone is able to effectively block the fluid flow in the second direction of displacement B, but it is necessary to apply a significant force in the first direction of displacement A to obtain sufficient deformation of the cone to allow the passage of a low-flow fluid. In other words, the cone only deforms if a sufficient height of fluid is present in the pipe 3.

[0038] In order to improve the ability to deform the gate 4 for low fluid flow rates along the first direction of movement A, i.e. at a low flow rate, it is proposed to provide a gate 4 which is devoid of circular section along cutting planes which are perpendicular to the first direction of movement A, i.e. to the longitudinal direction of the gate 4 and the pipe 3.

[0039] Preferably illustrated in [Fig. 2], the first end of the door 4 is formed with a movable portion 4b which has a lip 4b' and two hinges 4b'. The lip 4b' has a radius of curvature that is greater than the radii of curvature of the two hinges 4b'. The two hinges 4b' are separated by the lip 4b', and each of the hinges 4b' separates the lip 4b' from the fixed portion 4a. This configuration makes it possible to form a lip 4b' that deforms more easily when a force is applied to the outer wall of the lip 4b' in the direction of the inside of the cone. The lip 4b' deforms between a contact position where the lip 4b' closes the gate 4 and a deformed position where the lip 4b' defines a channel for the passage of a fluid.

[0040] It is also advantageous to provide that the inlet area of ​​the gate 4 defines two reinforcements 5 that separate the fixed portion 4a and the movable portion 4b. The two reinforcements 5 create a narrowing of the width of the gate inlet 4. The width is measured along a longitudinal direction perpendicular to the axis of the pipe 3 when the check valve 1 is mounted in the pipe 3. Preferably, each reinforcement 5 defines an inflection in the radius of curvature of the gate inlet 4. Preferably, each of the reinforcements 5 defines a reversal of the curvature with respect to the curvature present in the movable portion 4b. The reinforcement areas 5 separate the fixed portion 4a and the movable portion 4b. Depending on the configuration, the reinforcement areas 5 are mounted fixed or movable with respect to the mounting system 2.

[0041] By changing the orientation of the radius of curvature, the reinforcement zones 5 are able to concentrate the forces of the liquid on the moving portion 4b to facilitate the deformation of the moving portion 4b at low flow rate.

[0042] Advantageously, the radius of curvature of the reinforcement zones 5 has a value which is greater than the value of the radius of curvature of the hinges 4b” in absolute value.

[0043] When the pipe 3 has a circular cross-section, it is advantageous to use a fastening system 2 which also has a circular external cross-section. Preferably, the center of the circular external cross-section corresponds to the center of the radius of curvature of the lip 4b'.

[0044] Advantageously, the movable portion 4b extends from the entrance, i.e., the first end, towards the second end, retaining the lip 4b', the hinges 4b' and the reinforcements 5 for less than 30% of the length of the door 4, preferably less than 20% of the length of the door 4. The radius of curvature can be kept constant along the entire length of the movable portion 4b, but it is also possible to allow a reduction in the radius of curvature as long as it remains less than that of the hinges 4b'.

[0045] To facilitate the opening of the gate 4 at a low flow rate applied to the outer wall of the moving portion 4b, it is advantageous for the moving portion 4b to have a constant radius of curvature over at least 5%, and preferably at least 10%, of the length of the gate 4. The length is measured along the perimeter of the membrane. Maintaining the radius of curvature reduces the force required to deform the moving portion 4b and form the channel that allows fluid to pass through in the first direction of movement A.

[0046] In a particular embodiment, the movable part 4b is made of polymer material, preferably elastomer. Advantageously, the door 4 is entirely made of a polymer material, for example, an elastomer. The movable part 4b deforms elastically between its first and second positions. Depending on the configuration, the thickness of the material forming the fixed portion 4a may be greater than or equal to the thickness of the material forming the movable portion 4b. It is also possible to specify that the thickness of the material forming the two hinges 4b” is greater than or equal to the thickness of the lip 4b'. It is also possible to specify that the thickness of the material forming the fixed portion 4a is greater than or equal to the thickness of the material forming the two reinforcement zones 5.

[0047] To facilitate the opening of the door 4 when low flow rates are applied to the outer wall of the door, it is advantageous to extend the lip 4b with a tail 6 that extends over at least 30% of the length of the door 4. The tail 6 does not contribute to the sealing of the check valve 1; that is, the tail 6 is not in contact with the pipe 3, the fastening system 2, or any other element that contributes to the sealing of the locked position. The tail 6 may be flat or slightly rounded. Slightly rounded means a radius of curvature that is greater than or equal to the radius of curvature of the lip 4b'. The radius of curvature of the tail 6 is oriented in the same direction as the lip 4b'. It is also possible to have a tail 6 with a radius of curvature that is greater than 85% of the radius of curvature of lip 4b'.Preferably, the length of the tail 6 represents at least 60% of the total length of the gate 4, i.e., the sum of the length of the inlet area and the tail 6. If the fastening system 2 bears only on the inner wall of the pipe 3, the width of the tail 6 corresponds to 30% of the width of the fastening system 2. If the fastening system 2 bears only on the outer wall of the pipe 3, the width of the tail 6 corresponds to 30% of the bearing area on the outer wall, less the thickness of the pipe 3. Preferably, the width of the tail 6 is at least equal to 50% of the inner width of the pipe 3. Preferably, the gate 4 and the tail 6 form a single unit that constitutes the membrane. The tail 6 is preferably without the reinforcements 5.Preferably, the outer wall of tail 6 is not in contact with another wall to ensure the door is sealed in the locked position.

[0048] The cross-section of the gate 4 decreases as one approaches the second end. The lower outer wall of the tail 6 moves away from the lower inner wall of the pipe 3, that is, it moves closer to the upper inner wall of the pipe 3 as one approaches the second end. In other words, the lower wall of the tail is inclined upwards from the inlet towards the bottom. This helps to limit the pressure loss when the fluid has to flow through the pipe 3.

[0049] When the check valve 1 is mounted in a pipe 3 and is intended to block or allow the passage of a liquid, the lower part of the gate 4 is formed by the lip 4b' while the upper part of the gate 4 is formed by the fixed portion 4a. Preferably, the fixed portion 4a of the inlet is extended by a fixed portion of the tail 6 which extends along the longitudinal direction of the pipe 3 so that the upper part of the gate 4 remains at a constant distance from the upper part of the pipe 3 or deviates less than the lower part of the tail 6. Conversely, the lower part of the tail 6 is oriented so as to approach the upper part of the pipe 3 when moving from the first end to the second end.The lower wall of the tail 6 has an inclination which allows it to reach at least the centre of the pipe 3 and preferably at least the upper third of the pipe 3. Depending on the configurations, the shape of the pipe 3 corresponds substantially or exactly to the shape of the fixing surface of the fixing system 2.

[0050] In a particular embodiment, the hinge 4b” extends over a length greater than the length of the lip 4b' and extends into the tail 6. Preferably, the hinge 4b” extends to the bottom wall of the tail 6. The hinge 4b” preferably extends along a longitudinal direction or at an angle less steep than the angle of the bottom wall of the tail 6. This embodiment is particularly advantageous when the hinge 4b” extends over a length less than 20% of the longitudinal direction of the pipe, i.e., along the length of the gate 4, and when the reinforcement zone 5 extends beyond the hinge 4b”. The edges of the tail 6 are curved so as to close the gate 4 and define a substantially conical or frustoconical element.Preferably, tail 6 defines a section whose width-to-height ratio (1 / h) decreases as one approaches the back of gate 4.

[0051] In a preferred embodiment, the check valve 1 has a stiffener 7 which is configured to stiffen one or more portions of the gate 4. It is advantageous to fix the upper portion of the tail 6 to the pipe 3 and / or the fixing system by means of the stiffener 7. The stiffener 7 prevents the bottom of the gate 4 from deforming towards the lower part of the pipe 3 and partially obstructing the pipe 3. The use of a stiffener 7 facilitates the formation of the membrane, for example in a single material and advantageously with a thickness that is more homogeneous between the different portions.

[0052] Preferably, the stiffener 7 provides the interface between the fastening system 2 and the membrane. The stiffener 7 can contribute to the sealing of the fastening system 2. In the illustrated embodiment, the stiffener 7 has an annular portion that surrounds the door entry area. The fixed portion 4a is attached to the stiffener 7 which is itself fixed to the fixing system 2. The lip 4b' comes to rest on the internal wall of the stiffener 7 to achieve the seal in the locking position.

[0053] The check valve 1 may be without the fixing system 2. It is then advantageous to use a stiffener 7 which achieves the fixing of the check valve 1 on the fixing system 2 or any means which is fixed on a fixing system 2.

[0054] The check valve 1 has a fixing system 2 which is configured to fix the fixed portion 4a on the pipe 3. In the illustrated embodiment, the fixing system 2 is configured to fix the fixed portion 4a on the inner wall of the pipe 3, but another fixing means may be used.

[0055] It is particularly advantageous to provide an embodiment in which the radius of curvature of each of the two reinforcement zones 5 is greater than the radius of curvature of the moving portion 4b. As a reminder, the radius of curvature of the two reinforcement zones 5 is opposite to the radius of curvature of the lip 4b' and the hinges 4b”. Such a configuration makes it easy to form two reinforcement zones 5 which will facilitate the deformation of the moving portion 4b and thus facilitate the formation of a channel allowing the passage of a fluid in the first direction of movement A when the fluid applies a force to the outer wall of the moving portion 4b.

[0056] Preferably, the fixed portion 4a defines a zone with a reversal of curvature of its lateral wall, and this reversal of curvature is located equidistant from the two hinges 4b” and / or equidistant from the two reinforcement zones 5. The reversal of curvature is used to stiffen the fixed portion 4 and thus prevent the hinges 4b’’ from using part of the force applied by the fluid to deform the fixed portion 4a. In the advantageous embodiment illustrated, the reversal of curvature of the fixed portion 4a is located opposite the moving portion 4b along the plane of the perpendicular bisector of the two hinges 4b”.

[0057] In an advantageous embodiment, the movable portion 4b and the two hinges 4b' ' extend over less than 20% of the length of the door 4, the length being measured along the first direction of movement.

[0058] It is particularly advantageous that the movable portion 4b of the inlet zone, which ensures sealing, does not extend over a length exceeding 30% of the length of the gate 4, as this has the effect of reducing the length of the tail 6 and therefore reducing the effective surface area of ​​the outer wall of the gate 4 that receives the force from the fluid flowing in the first direction of movement, i.e., the lower face of the tail 6. By using a tail 6 that has at least 50% of the length of the membrane, the greater the length of the tail 6, the more the membrane is able to deform in the presence of a low flow rate. The force applied by the fluid on the wall external force 6 of the tail is applied over a large area, generating a significant force that aims to deform the moving portion 4. A person skilled in the art will adjust the inclination of the external wall of the tail to define the flow rate from which the moving portion 4b deforms.

[0059] It is also advantageous not to have reinforcement zones 5 extending over the entire length of the door 4 because this implies having reinforcement zones 5 with an orientation that changes with depth in the door 4, which makes it more difficult to obtain a deformable movable wall with a low fluid flow.

[0060] It is particularly advantageous that the reinforcement zones extend over a length that represents less than 80% of the length of the door 4, preferably less than 30%, preferably at least 5%.

[0061] To facilitate the operation of the door 4, and more specifically of the movable portion 4b, it is particularly advantageous to provide a door 4 with planar symmetry, i.e., a plane of symmetry. It is also particularly advantageous for the second end of the door 4 to be located above a separation plane passing through the two reinforcement zones 5 and perpendicular to the plane of symmetry. The movable portion 4b, located at the first end, is situated below the separation plane.

[0062] In the illustrated example, the check valve 1 is a check valve designed to block a liquid. The fixed part 4a of the inlet area and the final portion of the second end are located in the upper part of the check valve 1, while the movable part 4b at the first end is located in the lower part of the check valve 1. The separation plane is a horizontal or substantially horizontal plane defined by the two reinforcement areas 5.

[0063] Below the separation plane, a force applied to the outer wall of the tail 6 deforms the movable portion 4b. The two hinges 4b” facilitate the deformation of the lip 4b' to allow the fluid to pass through. A force applied to the outer wall of the tail 6 above the separation plane also deforms the gate 4 to facilitate the flow of liquid. However, when the fluid reaches an outer wall located above the separation plane, the total force applied by the fluid is sufficient to cause significant deformation of the gate, thus indicating a large flow of fluid. In this case, the fluid is able to exert a significant force to deform the gate 4, and it is preferable that the obstruction of the check valve 1 in the lower part of the pipe 3 be as small as possible.

[0064] It is particularly advantageous to offset the gate 4 relative to the pipe 3 so that the inclination of the bottom wall of the tail 6 is greater than the inclination of the fixed part of the gate 4, i.e. the upper part of the membrane. In the illustrated embodiments, it appears that the upper part of the gate 4 remains substantially at the same distance from the upper part of the pipe 3, while the lower part of the gate 4 moves closer to the upper part of the pipe 3 when moving from the first end to the second end.

[0065] This feature allows, when a large flow circulates in the pipe 3 in the first direction of movement A, the deformation of the movable portion 4a to be permitted while not preventing or reducing the generation of a force applied to the upper part of the outer wall of the door 4 which would tend to deform the door downwards, which tends to obstruct the section of the pipe 3 and thus limit the flow of fluid.

[0066] It is particularly advantageous to have an upper part of the non-return valve 1 and more particularly of the gate 4 which is located beyond the median horizontal section of the pipeline and even more preferably in the highest 25% of the pipeline in a vertical direction.

[0067] In the embodiment illustrated in the various figures, the lip 4b' forms a step. The step rests on a complementary form of the fastening system or stiffener 7, which ensures a good seal of the lip 4b'.

[0068] In a preferred embodiment, the lip 4b comes into direct contact with the fastening system 2 and, even more preferably, with the stiffener 7 attached to the fastening system 2. The liquid flowing in the first direction of movement A comes into contact with the tail 6. The force applied to the tail 6 deforms it, causing it to deepen. As the force increases, the deepening progresses towards the first end. Once a threshold force is reached, the lip 4b' pivots from the closed position to the open position, defining a channel that allows the liquid to flow. Since the radius of curvature of the tail 6 is large, the contact area with the liquid is significant, generating a greater force than prior art configurations. It is then possible to open the door with a lower fluid flow rate.Preferably, the tail 6 has a constant inclination along a vertical cross-sectional plane when the check valve 1 is installed. It is advantageous for the tail 6 to have a width that represents at least 33% of the internal width of the pipe 3 over at least 50% of the length of the gate 4 so that the fluid exerts a significant force on the tail 6. Preferably, the width is at least equal to 50% or even 66% of the internal width of the pipe 3. The width is measured along a horizontal direction and can correspond to a diameter for a circular cross-section.

[0069] It is also particularly advantageous to provide that the non-return valve 1 is equipped with a stiffener 7 which is fixed to the fixing system 2 and which is also fixed to the door 4 and more particularly to the fixed portion 4a of the door 4. The stiffener 7 is configured to have greater rigidity than the fixed portion 4a of the door 4 and thus prevent the second end from falling under the effect of its weight when the door 4 is fixed only by means of its first end.

[0070] Depending on the configurations, the stiffener 7 can be made of metallic materials, wood or plastic materials or any other material which can withstand the mechanical stresses applied by the weight of the door 4. It is particularly advantageous to make the stiffener 7 out of plastic materials.

[0071] In a preferred configuration, the second end of the gate 4 defines one or more through holes 8 that extend along the first direction of movement A. In the illustrated embodiment, the second end of the gate 4 defines two through holes 8. It is advantageous for the stiffener 7 to have two end rods 7a. The two rods 7a pass through the two through holes 8 so as to support the second end of the gate 4. It is also advantageous for the two rods 7a to apply a tensile force to the two through holes 8 and the first end so as to stretch the gate 4 along the first direction of movement A, which facilitates maintaining its shape over time. The tensile force applied by the two rods 7a reduces the deformation of the gate 4, which facilitates achieving a good seal when the fluid flows in the second direction of movement B.

[0072] In an advantageous embodiment, the fastening system 2 has a circular cross-section for attachment to a pipe 3 whose inner wall also defines a circular cross-section. It is particularly advantageous that the circular cross-section defined by the fastening system 2 shares the same center of curvature as the radius of curvature of the movable portion 4b of the gate 4 and preferably of the lip 4b'. In this particular configuration, the force applied by the fluid, which is supported on the inner wall of the pipe 3 and on the outer wall of the gate 4, preferably on the movable portion 4b and even more preferably on the tail 6, generates a radial force on the movable portion 4a, which facilitates the deformation of the lip 4b'.

[0073] Advantageously, the movable portion 4b of the gate 4 is in the form of a lip 4b' which comes to rest against the fixing system 2, against the stiffener 7 or against the inner wall of the pipe 3. When a flow of liquid enters the gate 4 according to the second direction of movement B, the weight of the liquid presses on the lip 4b' which increases the sealing of the non-return valve 1.

[0074] In a particular embodiment, the fastening system 2 is configured to be fixed to the inner wall of a pipe 3, i.e., to bear solely on the inner wall of the pipe 3. Even more advantageously, the fastening system 2 is waterproof.

[0075] In a particular embodiment, the fastening system 2 comprises a first frame 9 that defines a first external shape and a second frame 9 that defines a second external shape. Preferably, the first external shape is identical to the second external shape.

[0076] The fastening system 2 also includes a ring 10 made of deformable polymer material. The ring 10 separates the first reinforcement 9 and the second reinforcement 9 according to the direction of fluid flow inside the pipe 3.

[0077] The fastening system 2 includes a compression system 11 that connects the first reinforcement 9 and the second reinforcement 9. The compression system 11 is configured to define the distance between the first reinforcement 9 and the second reinforcement 9. The compression system 11 is configured to compress the ring 10 between the first reinforcement 9 and the second reinforcement 9. Depending on the configuration, the first reinforcement 9 may be in direct contact with the ring 10 or it may be separated from the latter by an intermediate element, for example, the stiffener 7 or a membrane fastening element with the fastening system 2. It is also possible to provide that the second reinforcement 9 is in direct contact with the ring 10 or that it is separated from the latter by an intermediate element, for example, the stiffener 7 or a membrane fastening element with the fastening system 2.

[0078] The closer the first armature 9 and the second armature 9 are to each other, the more the ring 10 is compressed and deforms to press against the inner wall of the pipe 3. The force applied by the ring 10 on the inner wall of the pipe 3 makes it possible to fix the fixing system 2 to the pipe 3. It has been observed that the deformation of the ring 10 induces a fixing force which is sufficient to obtain a strong fixing of a device for functionalizing the pipe 3, for example a non-return valve 1.

[0079] Applying a compressive force to the ring 10 by means of the first reinforcement 9 and the second reinforcement 9 causes the ring 10 to protrude beyond the first and second external shapes and to bear against the inner wall of the pipe 3. Figures 5, 10 and 12 illustrate a ring that is domed with a central portion that is closer to the inner wall of the pipe 3 than the ends of the ring 10 in the longitudinal direction of the pipe 3. This configuration is more advantageous than the opposite configuration where the ends are closer to the inner wall than the central portion of the ring 10.

[0080] In a particular embodiment, the outer face of the ring 10 extends in a straight line between the first outer form and the second outer form in the absence of mechanical stress. It is particularly advantageous that the The first external shape is identical to the second external shape. Advantageously, in the absence of stress from the first and second reinforcements 9, the ring 10 extends beyond both the first and second external shapes. Compression of the ring 10 by the two reinforcements 9 accentuates the curvature of the ring 10. The two reinforcements 9 are preferably made of metal to form rigid structures and facilitate the deformation of the ring 10.

[0081] Preferably, the compression system 11 passes through the ring 10, which facilitates the joining of the compression system 11 and the ring 10 to form a fixing system 2 which is watertight.

[0082] Advantageously, the first and second fittings 9 are both annular fittings, that is, fittings that define a through hole. It is then possible to form a fastening system through which a fluid can pass. This embodiment is used to secure a non-return valve 1, which is illustrated in Figures 1 to 12. Alternatively, the first and / or second fittings 9 are sealed. The fastening system 2 then forms a pipe plug.

[0083] The fastening system 2 is particularly advantageous because it bears against the inner wall of the pipe 3, thus allowing for a compact installation. It is advantageous to use a compression system that employs one or more screws 1la and one or more corresponding nuts 11b. In one configuration, the screw 1la is fixedly mounted to the first or second bracket 9, and the nut 11b is rotatably mounted to adjust the compression force applied to the ring 10. In another configuration, the nut 11b is fixedly mounted to the first or second bracket 9, and the screw 1la is rotatably mounted to adjust the compression force applied to the ring 10. These embodiments are simple because they allow the compression force to be adjusted when only one end of the pipe 3 is accessible.

[0084] The fixing system 2 can be completely disassembled and it is possible to interchange the two armatures 9 and the screws 1la and the nuts 11b to adapt to the configuration of the pipeline 3.

[0085] The figures illustrate the installation of the fastening system 2 on a check valve 1, but such a fastening system 2 can be used on other pipeline functional devices 3. It is possible to replace the diaphragm check valve with a band check valve or with a check valve using another technology. It is also possible to replace the check valve with another device, for example, a section reducer, a plug, or a pipeline flow monitoring device.

[0086] When the fastening system 2 is intended to fasten a device that allows the When a liquid passes through it, it is advantageous for the thickness of the ring 10 in its lower portion to be less than the thickness of the material in the upper portion. This limits the height of the step that the liquid must overcome at very low flow rates. This prevents excessive amounts of liquid from pooling in front of the fastening system 2. Preferably, the compression system 11 compresses the thickest part of the ring 10 to better control its deformation. It is particularly advantageous for the internal shape of one or both of the reinforcements 9 to replicate the shape of the ring 10 in order to better distribute the compressive force across the thickness of the ring 10. It is also advantageous to route the compression system 11 through the ring 10 to orient the ring 10 and the reinforcements 9 in the same direction.

[0087] In order to better control the deformation of the ring 10, it is advantageous to provide a stiffener 7 whose outer wall bears against the inner wall of the ring 10. The stiffener 7 is fixedly mounted to one of the reinforcements 9 and is mounted to move relative to the other of the reinforcements 9. In this way, when the compression system 11 moves the reinforcements 9 relative to each other, the ring 10 is compressed and is blocked by the stiffener 7 which limits the deformation of the ring 10 towards the inside. Preferably, the outer wall of the stiffener 7 has a shape complementary to the shape of the inner wall of the ring 10. The use of a stiffener 7 allows the use of a ring 10 of reduced thickness which limits the amount of stagnant water in the bottom of the pipe when the fixing system 2 is associated with a through-fitting device.

[0088] In a particular embodiment, the first end of the door 4 has a shape complementary to the first end of the stiffener 7. The fixed portion 4a of the door 4 is wedged between the two reinforcements 9 by means of the ring 10.

[0089] It is particularly advantageous to have a ring 10 whose length is at least equal to 20% of the diameter of the pipe 3, which corresponds to the external diameter of the fixing system 2.

[0090] Preferably, the ring 10 is made of a polymer material having a hardness between 20 and 80 shore, preferably between 30 and 70 shore.

Claims

Demands

1. A fastening system (2) to an internal wall of a pipe (3) comprising: - a first reinforcement (9) having a first external shape and a second reinforcement (9) having a second external shape; - a ring (10) made of elastically deformable polymer material, the ring (10) separating the first reinforcement (9) and the second reinforcement (9) along a longitudinal direction of the pipe (3), the ring (10) having a length at least equal to 20% of the external diameter of the fastening system (2) corresponding to the diameter of the pipe (3); - a stiffener (7) fixed to the first reinforcement (9) and mounted to move relative to the second reinforcement (9), the stiffener (7) being annular in shape, the ring (10) bearing against an external wall of the stiffener (7);- a compression system (11) connecting the first reinforcement (9) and the second reinforcement (9), the compression system (11) being configured to define the distance between the first reinforcement (9) and the second reinforcement (9) and to compress the ring (10) between the first reinforcement (9) and the second reinforcement (9), the ring (10) extending beyond the first external form and the second external form to press against the internal wall of the pipe (3) and fix the fixing system (2) to the pipe (3).

2. Fixing system (2) according to claim 1 in which the compression system (11) passes through the ring (10).

3. A fastening system (2) according to any one of claims 1 and 2 in which the outer wall of the stiffener (7) has a shape complementary to the shape of the inner wall of the ring (10).

4. Fixing system (2) according to any one of claims 1 to 3 wherein the first reinforcement (9) and the second reinforcement (9) are two annular reinforcements to form a fixing system (2) which can be traversed by a fluid.

5. Fixing system (2) according to any one of the preceding claims wherein the first frame (9) and the second frame (9) are made of metal.

6. A fastening system (2) according to any one of the preceding claims, wherein the ring (10), the first reinforcement (9) and the second reinforcement (9) are of circular external section.

7. A fastening system (2) according to any one of the preceding claims, wherein the compression system (11) is formed by a plurality of threaded rods mounted for rotation to define the distance between the first reinforcement (9) and the second reinforcement (9), and wherein either the head of the threaded rod (1a) is blocked against rotation by the first or second reinforcement (9), or the threaded rods (1a) are mounted in nuts (11b) blocked against rotation by the first or second reinforcement (9).

8. Fastening system (2) according to any one of the preceding claims wherein the ring (10) is made of elastomer.

9. Fixing system (2) according to any one of the preceding claims wherein the stiffener (7) is mounted on one of the first reinforcement (9) and the second reinforcement and mounted to bear on the inner wall of the ring, the stiffener (7) being annular in shape, the inner wall of the ring bearing on the stiffener (7).

10. Method of fixing a fastening system (2) against the inner wall of a pipe (3) comprising the following steps: - providing a fastening system (2) according to any one of the preceding claims and a pipe (3); - installing the fastening system (2) inside the pipe (3); - compressing the ring (10) by means of the compression system (11) so as to deform the ring (10) towards the inner wall and fixing the fastening system (2) against the pipe (3).

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