DE3206311A1 - LOAD CAPACITY FLUID PIPING ARRANGEMENT AND CONNECTION THEREOF - Google Patents

Description

HOFFMANN · EITJTJB & PARTNER

PAT ICN TAN W ΛΓ / Γ Κ DR. ING. E. HOFFMANN (1930-19 / 6). D I Pt.-I NG. W. EITLE · D R. RER. NAT. K. H OFFMAN N. Dl PL.-I NG. W. LEH N

DIPL.-ING. K. FOCHSLC DR. RER. NAT. ti. HANSEN ARABELLASTRASSE 4 (STERNHAUS) D-8000 MD N C Il E N 81 TELE FO N (069) 9110B7. TELEX 05-29619 (PATH E)

36 449 p / hl

Resistoflex Corporation,
Roseland, NJ / V.St.A.

Load-absorbing fluid line arrangement and connection for this

The invention relates to connections for a fluid line and for flow line arrangements formed therefrom.

In the aviation industry, especially in connection with Aircraft engines the requirement for a fluid line with certain functional properties was developed, which cannot be achieved without a strict μηα undesirable aggravation in terms of weight, size, Cost or a combination of these properties.

For example, gas turbines are currently being built with extreme tolerances so that they can be rigidly mounted point-to-point rigid tubing can be used. A rigid pipe is considered by many in the industry to be one Requirement for handling critical fluids such as fuel. The reasons for this are enclosed the consideration of the fire resistance, the Resistance to accidental puncture and the like. In general, aircraft engine designers believe

that a metal pipe is more reliable than a flexible hose. However, metal pipes are sensitive to stress, giving the engine designers a recourse to maintaining the tolerances between the pipe connection points have chosen that move within very narrow limits so that the metal tube assemblies do not come together are subjected to special stress. However, such a practice is costly. Furthermore There is a constant thermal expansion and contraction during engine operation that one has to deal with Has. So far, expensive means have been used to help, such as expansion loops, Dogleg bends or even bellows cuts in the metal pipes to solve this problem. This problem was further complicated by the frequent requirement (due to security considerations) for redundancy (overdetermination) in such fluid lines.

An answer to the redundancy requirements can be found in the Applicant's U.S. Patent 4,293,150. This earlier patent describes a fluid line arrangement with at least two tightly fitting concentric tubes, each of which is independent of one another for the Fluid is impermeable. End fittings attach to each end of the conduit and have separate ones Sections that are each fluid-tight to a different one of the two tubes with a separate fluid therebetween Seal are connected. The outer tube is metallic, while the inner tube is non-metallic. 30th

Although this earlier patent is an answer to the redundancy problem there is no answer to the tight tolerances and thermal expansion and contraction problems.

The object of the invention is therefore to provide a fluid line arrangement of the type mentioned, in which not only the redundancy problems but also the problems of tight tolerances and thermal expansion and contraction are solved.

According to one aspect of the invention is to solve the task of a connection for a flow line arrangement provided in which the conduit comprises at least one fluid-impermeable solid metal tube. The connection comprises a component part, which via a device at one of its ends the connection with a other element connects. At the other end of the component part there is an additional device for attachment at one end of the metallic tube with a fluid-tight connection. This additional facility is connected to the component part so that limited movement between the parts is possible. Also is a Device for independently attaching the interior of the component part with a fluid-tight seal provided at one end of a non-metallic, fluid-impermeable tube, the non-metallic Pipe is sized so that it occupies a substantially tight fit within the additional device and protrudes from this in the component part.

In accordance with another aspect of the invention, a fluid conduit assembly is provided which a fluid conduit which is provided with connections at opposite ends. The line includes at least two tightly fitting concentric tubes, each of which is independently fluid impermeable. That outermost is a solid metal tube and the inner one is a non-metallic tube. The connections each have separate Sections that are each connected to a different of the two pipes, with a separate one in between

located fluid-tight seal. The extreme The tube is connected to the connector by means of limited movement between the ends of the outer tube and the respective associated connection allowed. The innermost tube is constructed and arranged in such a way that that it absorbs any movement between the outer tube and the connectors.

Although the invention is described herein with reference to a very specific mounting situation, it does is a description of an advantageous thing, the applicability of which is versatile and not on lines for aircraft engines or turbines is limited.

Further details, features and advantages of the invention emerge from the following description of the FIGS Drawings purely schematically illustrated embodiments. It shows:

FIG. 1 is a fragmentary schematic view of FIG Parts of an aircraft turbine housing, between which a fluid line arrangement accordingly the invention is installed,

Fig. 2 is an enlarged view of one end of the flow

medium line arrangement of Fig. 1 with broken away Sections for clarifying the details,

3 is a view similar to FIG. 2 and shows a modified line arrangement connection,

FIG. 4 shows a view similar to FIG. 2, but with the illustration of a further modified connection

ses for use between two sections of tubing,

FIG. 5 is a view similar to FIG. 4, but with yet another modification of the invention and FIG

FIG. 6 is a view similar to FIG. 4, but showing yet another modification

the invention.

The same reference symbols are used in connection with the description of all drawings for the same or the same Parts used.

In Fig. 1 of the drawings, fragments of a motor housing are shown and given the reference numerals 10 and 11. Each housing section is provided with a connection nipple 12 or 13 provided with an external thread. A fluid line arrangement, which is indicated generally by the reference numeral 14 is female end connections 15 and 16 provided. With these connections 15 and 16, the fluid line arrangement is with the Connection nipples 12 and 13 connected.

Construction details of the end connections 15 and 16 can be seen in FIG. Both connections are identical. As shown in Fig. 2, the line arrangement comprises a line 17, which consists of two flush with each other seated concentric tubes 18 and 19 consists. Each of the tubes 18 and 19 is independently impermeable for the fluid. The outermost tube 18 is a solid metal tube and the innermost tube 19 is a non-metallic one Pipe. The tube 18 can be made of stainless steel, while the tube 19 is made of polytetrafluoroethylene (PTFE). One suitable method of making the tube 19 is disclosed in U.S. Patent 2,752,637 entitled "Extrusion of Polytetrafluoroethylene ". One suitable method for installing the PTFE tube 19 within the steel tube 18 is in U.S. Patent 3,050,786 entitled "Methods of Lining and Jacketing Tubular Members with Prestressed Polytetrafluoroethylene "described.

The end fitting includes, at one of its ends, means for connecting it to the other element at Material example with the approach or nipple 12 or 13. Such means consist of the rotary nut 20, which on one end a component part 21 is mounted and held thereon by an obstacle or a retaining wire 22. Additional Means consisting of a metallic sleeve 2 3 are for attachment to an end 24 of the outermost tube 18 provided, for example by soldering the pipe end 24 within the counterbore 25. The sleeve 23 is located with a loose sliding fit within a bore 26 which runs through the component part 21. As shown in Fig. 2, the outside of the sleeve is with a Circumferential groove 27 is provided, which is opposite to a circumferential groove 28 on the inside of the bore 26. An obstacle or Retaining wire 29 is located in grooves 27 and 28 to fix sleeve 23 within component part 21. One of the grooves 27 or 28, in this case the groove 27, has a larger dimension in the axial direction of the connection, whereby a limited axial movement between the sleeve and the component part 21 is possible. In addition, is the outer diameter of the sleeve 23 is smaller than the diameter of the bore 26 where the parts overlap to to allow a slight angular movement between the sleeve 23 and the component part 21. In an example this Embodiment is almost an axial movement of + 1.27 mm (+ 0.05 inch) is allowed between parts 23 and 21 while angular movement between these parts of + 1 1/2 ° is tolerated. However, greater or lesser axial and angular movement can be allowed, such as this is obvious to those skilled in the art.

A flow agent sealant in the form of an elastomeric O-ring 30, supported by a split cast PTFE ring 31, is located within a circumferential pocket 32,

which is formed between the sleeve 23 and the component part 21. The O-ring is used to set up a fluid tight seal between parts. As can be seen from the drawing, the rear support ring is 31 relatively incompressible and tends to act as a fulcrum for the angular movement of the sleeve 23 within the bore 26 to function. In this regard, a free space between the wire 29 and the groove 27 should be pointed out will.

According to the illustration, the inside diameter of the Sleeve 23 chosen so that it preferably coincides with the inner diameter of the tube 18, whereby a smooth Continuation of the same for the tube 19 is provided. However, the end of the sleeve 23 has an inner diameter which tapers conically at 33 to provide a gradual and smooth transition surface to the portion of the bore 26, which directly receives the end 34 of the PTFE tube 19 running there. The bore 26 is in the area 35 of the component part 21 interrupted by circumferential barbs 36. A radially expanded metal insert 37 is located within end 34 of tube 39 and pushes the end of the tube against the barbs 36 which capture the pipe end and fluid-tight between the respective parts Set up lip seal. A dynamic metallic lip seal 38 is located at the extreme end of the Component part 21 within the nut 20 for establishing a fluid-tight connection with the connection nipple. Reference is made to US Pat. No. 3,083,989 entitled "Reusable Fitting with Metallic Sealing Ring".

The component part 21 is at 39 with key flats provided that allow the part 21 to be made immobile against rotation when the nut 20 to produce the connection

dung with the connection nipple] 12 or 13 is manipulated.

The outer end 40 of the sleeve 23 extends from the component part 21. Two peripheral zones 41 and 43, separated by one Groove 42 are provided on this outer end with a corrugated surface to indicate the relative axial position the sleeve 23 within the bore 26 to serve. With this display available, the installer can use the Verify conduit assembly that the limits of available movement have not yet been reached. Alternatively can this indication can be used to verify that a certain preload is present after an initial installation in order to reduce the amount resulting from use anticipated burdens.

A suitable assembly sequence could be to fix the sleeves 23 on the ends of the metal tube 18, before the PTFE insert tube 19 was installed. The insert 37 is then in a non-expanded state within of the end 34 of the tube 19 is arranged. The O-ring 30 and the rear support ring 31 are installed on the sleeve 23, whereupon the component part 21 is pressed onto the end 34 of the tube 19. A retaining wire 29 is known on Way inserted and the insert 37 expands radially.

Finally, the nut 20 is brought to the desired location and then the wire 22 is attached in a known manner.

When the conduit assembly 14 is in place and in operation, the PTFE tube 19 has sufficient elasticity to expand or to tighten, as may be the case with the axial rotation of the sleeve 23 relative to the Component part 21. At least this is the case for an axial movement of + 1.27 mm (+ 0.05 inch) corresponding to the Design for this example. If necessary, the end

connections are attached to the cable ends is within the bore 16 located sleeve 23 to limit its inward movement, held by the Wire 29. However, the arrangement may be dimensioned such that under nominal conditions of attachment the sleeve 23 will assume an intermediate axial position relative to the component part or a final limit state, depending on how this is desired. The insertion tube should preferably be in the attached state in the nominal position under lighter Tension.

When additional fire resistance is required this can be achieved by replacing the elastomeric O-ring 30 with one made of high temperature graphite fiber material or the like. Existing ring. In addition, if wear resistance is required on the outer surface of the tube 19, where this is in engagement with the nose 33 of the sleeve 23, this can be achieved by using a suitable filler in the outer surface layer of the pipe 19 through a concentric view Extrusion process is introduced in a known manner. Such a filler can also increase the bridging strength of the pipe 19 improve or increase if the pipe 18 should develop stress cracks or the like.

An embodiment of the invention can be used where redundancy in the line is not required shown in FIG. The following description is based on this embodiment.

The elements 20, 21, 22, 29, 30, 31 and 37 are identical to those of the embodiment described in connection with FIG. 2. However, the additional means for connecting the connector to the line is the metal sleeve 50, to the right of the groove 27 when FIG. 3 is viewed, is constructed differently. This means that the sleeve is now generally

the reference number 50 bears. It runs to the right and is provided with a countersunk hole 51 on one shoulder 52 to receive the end of the solid metal tubing 53 ends. The tube 53 can be soldered to the sleeve 50 or be connected to it in a similar way. The interior of the sleeve 50 is to the left of the shoulder 52 in the area with an enlarged diameter and provided with barbs 55 formed at a distance on the circumference, which are mirror images to the section 35 of the component part 21 are dimensioned and designed. A short section of the PTFE tube 56 takes the place of the protruding storage tube 19 of FIG. Its end 57 is in a fluid-sealing one Contact with the barbs 5 5 pinched by a radially expanded insert 58. The insert 58 is preferably identical to insert 37, but turns into opposite ones during assembly Direction aligned. It is intended to dimension the groove 27 relative to the wire 29 so that an axial movement of the sleeve 50 relative to the part 21 by + 1.587 mm (+ 0.0625 inch) and an angular movement of + 2 °. However, these dimensions should only be considered as an example.

One suitable arrangement is to place the inserts 37 and 58 in opposite ends of the pipe section 56 to use. The rear support ring 31 and the O-ring 30 are then arranged on the sleeve 50 and telescoped the latter over the end 57 of the tube 56 until the shoulder 52 abuts the insert .58, which is still is in the non-expanded state. The component part 21 is now pressed over the end 34 of the tube 56. The retaining wire 29 is inserted in a known manner and the inserts 37 and 58 are both expanded radially, preferably in a single operation with an extracted tool. Eventually, the mother will 20 at her particular Put in place and the wire 22 attached in a known manner.

It should be assumed that the end fitting is now a fully assembled unit. So they can Connections by applying a suitable mold block to the exterior of the sleeve 50 to the left of the shoulder 52 on the Ends of the metal pipe are attached, while the counterbore 51 is soldered to the end of the metal line. Of the Mold block prevents degradation of the end 57 of the tube 56 during soldering or possibly welding is carried out completely.

The embodiment shown in Fig. 3 is with a threaded connector for coupling the connector with a part which is other than a metallic pipe is. However, the invention is well suited for attachment to a unitary fitting for Connect with two metal pipes. Especially in situations that require the insertion of a connector in require an existing plumb line, with the ability of a defined but limited degree of articulation, it was found that the connector shown in Fig. 4 is preferable. Essentially it is the one with the connectors 2 and 3 the same construction, which provides the reactive movement, combined with two welding or Solder collars or the like. For interposing between two sections of a metal pipe. For example in a reinsertion situation, the existing end connections on the line can be left in place and the line can be interrupted at one or more desired points, whereupon the connections as shown in Fig. 4 may be positioned to reunite the severed ends.

According to FIG. 4, the connection comprises a component part 60 which is provided with a countersunk bore 61 at its ends is provided for receiving the end 6 2 of a first section of the metal tube. The design of the counterbore 61 and the adjacent sections of the component part 60

is intended for welding the connection to the pipe. Obviously, other suitable methods can be used for Connecting the component part 60 to the pipe end 62 can be used. An additional means, which from a metallic sleeve 63, can be attached to an end 64 of another portion of the metal tube be provided. In this example, the end of the sleeve 63 is provided with a counterbore 65 for receiving the pipe end 64 and provided for welding thereto in the same manner as the pipe end 62 in the counterbore 61.

The sleeve 63 is with a loose sliding fit inside a bore 26 running through the component part 60. As can be seen from Fig. 4, the outside is the sleeve 63 is provided with a circumferential groove 27 which is opposite a circumferential groove 28 on the inside of the bore 26. An obstruction or retaining wire 29 is in the grooves 27 and 28 to the sleeve 63 within the Component part 60 to be defined. One of the grooves 27 or 28, in this case the groove 27, has in the axial direction of the Connection a larger dimension, whereby a limited axial movement between the sleeve 6 3 and the component part 60 is possible. However, the outer diameter of the sleeve 63 is made a little smaller than the diameter of the Bore 26 where the parts overlap to allow slight angular movement between the sleeve 63 and the Component part 60 to allow. In this example there is an axial movement of + 1.27 mm between parts 63 and 60 (+ 0.05 inch) and an angular movement between these parts of + 11/2 ° tolerated. However, a greater or lesser axial movement and angular movement may be provided subsequently, as would be the case for those skilled in the art is recognizable.

A fluid sealant in the form of an elastomeric O-ring 30 connected by a split cast PTFE ring 31 is supported behind, is located within a peripheral pocket 32, which between the sleeve 6 3 and the Component part 60 is formed. The O — Ring is used for Establish a fluid seal between these parts. The rear support ring 31, which is relatively incompressible tends to act as a fulcrum for angular movement of the sleeve 63 within the bore 26.

10 In this regard it should be borne in mind that between the wire 29 and the groove 27 there is a free space.

According to the illustration, the inside diameter is the Sleeve 63 is preferably chosen so that it coincides with the inner diameter of the tubes 62 and 64. However has the inner end of the sleeve 6 3 has a conically tapering diameter at 33, around a gradual and smooth transition surface to provide the portion of the bore 26, which directly the tapering end 34 of the short portion of the PTFE tube 56 receives. The bore 26 is in the area 35 of the component part 60 is interrupted by circumferential barbs 36. A radially expanded metal insert 37 is located within the end 34 of the tube 56 and presses this tube end against the barbs 36, which the Capture the pipe and form a fluid-tight lip seal in between.

The outer end 66 of the sleeve 63 protrudes from the component part. Two circumferential zones 41 and 43, which are defined by a groove 42 are separated from each other, are provided with a corrugated surface as an indicator for the relative axial position the sleeve 63 within the bore 26 is used. With this available display, the line assembly attaching Person verify that the limits of available movement have not been reached. Alternatively, this

Display can be used to verify that a certain preload is present after initial application to reduce those resulting from use anticipated burdens.

The interior of the sleeve 63 is constructed in the same way as that of the sleeve 50 in Fig. 3 and is shouldered 67 at the end of a section 54 which has an enlarged diameter. There are circumferential barbs there 55, which are dimensioned in mirror image to those of the section 35 of the component part 60 and are designed. The end 57 of the short section of the PTFE tube 56 is in fluid-tight contact with the barb 55 squeezed by a radially expanded metal insert 58. The insert 58 is preferably identical to insert 37 but oriented in the opposite direction during assembly.

A suitable arrangement sequence can be that the inserts 37 and 58 are inserted into opposite ends of the pipe section 56. Thereupon be Rear support ring 31 and the O-ring 30 positioned on the sleeve 63. The latter is then telescoped over the end 57 of the tube 56 until the shoulder 67 on the insert 58 which insert is in its unexpanded state. The component part now becomes 60 pressed over the end 34 of the tube 56. The position hindering or holding wire 29 is in a known manner used. The inserts 37 and 38 are both expanded radially, preferably with an elongated tool in a single process.

Thus, the connection is designed as a completely assembled unit. The connection can be on the ends 62 and 64 of the metal pipe are applied in that a

appropriate mold block on the exterior of the sleeve 63 left the shoulder 67 is applied while the counterbore portion 6 5 is welded to the end of the metal pipe. The mold block prevents degradation of the end 57 of the tube 56 while the welding is being carried out. Likewise the counterbore 61 is welded to the pipe end 62, with a mold block covering the component part 60 over the area 35 surrounds. The embodiment of FIG. 4 functions in the same way as the embodiments of FIG. 2

and 3. '

When complete redundancy is required, it is possible to use one connection embodiment in certain situations To make use, which is shown in FIG. This embodiment will now be described. The connection consists of a component part 70 and a sleeve 71 which are connected to one another by a retaining wire 29 which cooperate with grooves 27 and 28 in exactly the same way as in the examples described above. A fluid tight seal between parts 7 0 and 71 is provided by an O-ring 30, which is supported in a pocket 32 by a ring 31. The display components 41, 42 and 43 are also the same. However, the component part 70 is provided with a counterbore 7 2 for receiving the end 7 3 of the sleeve 71 provided, both of which have a slight inner slope. The parts 70 and 71 are also with a uniform inner diameter of the same dimension and Equal to the inner diameter of the metal pipes 74 and 75, so as to have a continuous smooth and uniform Provide bore when the two tubes 7 4 and 75 are connected to one another. The outer ends of the Parts 7 0 and 71 are provided with weld countersunk bores 61 and 6 5, respectively, which are the same as those of FIG. To save weight the outer diameters of parts 70 and 71 in areas 76 and 77 can be reduced, as shown in FIG can be seen in the drawing.

It is envisaged that the metal pipes 74 and 75 will be connected to each other by the connecting parts 70 and 71 or several sections of the metal pipes are connected to one another by similar connections, whereupon the entire assembly is encompassed by a tube 78 made of PTFE by pulling the insert down and is pulled through the line in a known manner. Then the covered and easily hinged line bent and shaped in the areas between the terminals in any known manner, if so desired is. The ends of the conduit thus formed can be provided with end connections of the type shown in FIG.

In certain circumstances it may be desirable to introduce greater flexibility in the line than this achieved with the previously described embodiments can be. While the dimensions can be changed to provide more clearance for increased range of motion, this is not desirable.

The embodiment according to FIG. 6 serves as an alternative, which can be used advantageously. The embodiment of Fig. 6 can be developed using the parts used in the embodiment of Figure 6, but with a minimum of modification. If you have the Comparing the two figures, it can be seen that the embodiment of FIG. 6 has two identical component parts 60 with two retaining wires 29, two O-rings 30, two split PTFE rear support rings 31 and two metal inserts 37, all of which are the same as the corresponding parts of FIG. With the preceding parts acts a new sleeve 80 together, the left end of which when looking at the drawing on its outer diameter up to corrugated zone 43 is identical to part 63 of Fig. 4, and on its inner diameter to the area below the groove 27. The right half of the sleeve 80 is now mirror-like

figuratively to the left half, namely around a transverse plane. Since the parts of the sleeve 80 are essentially on the right and left side are the same, those on the right side are denoted by the same reference numerals, but with the addition of the letter "A". All other parts are with mirror image symmetry assembled. An encased tube 81 made of PTFE extends between the cavities 35 in the respective component parts 60. The arrangement and operation of the connector of Figure 6 are essentially the same as the connector according to FIG. 4. With regard to the differences between the parts Of course, there are also differences with regard to the arrangement and operation.

It should be understood that the principle of doubling up shown in FIG. 6 applies to any of those described herein Embodiments can apply. It exists thus no limitation to the modification of the embodiment according to FIG. 4.

While the illustrated and described embodiments, for example, a fastening of the connections Showing metal pipes by soldering or the like, it will be understood that any other form of attachment can be used with a suitable known modification of the connecting portion of the terminal. this means that various types of mechanical attachment, welding, gluing, etc. in connection with the Subject of the invention can be used.

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Claims (1)

HOFFATANN · EFTL / R Λ PAKTNICIi 1ΆΤ Ii N TAN WÄl / Γ Ii DR. ING. ü. HOFFMANN (1930-1Ϊ76). D I PL.-I N G. W. Γ Il LE ■ D R. RER. N AT. K. Il O f-FMAN N · D I PL.-I N G. W. I.E H N DIPL.-ING. K. FDCHSLr DR. KER. NAt B. HANSFN ARABFtLASTRASSE 4 (STAR HOUSE). D-8000 MD N C Il C N Ol ■ TELE FO N (08V) 911007. TE LEX 05-2V61? (PATH E) 36 449 p / hl Resistoflex Corporation,
Roseland, NJ / V.St.A. Load bearing fluid line arrangement and connection for this Claims MJ connection for a fluid line arrangement, characterized in that this connection has a first part (21) which on one of its Ends a device (20) for connecting the connector to another fluid-carrying one Element (10) is arranged, and a second part (23) comprises which at the other end of the first part (21) is arranged for attachment to a further one fluid-guiding element (17) that the second Part (23) is arranged in the first part that a limited relative movement to the first part (21) is provided and that means (36, 37) for independently mounting the interior of the first part (21) with a fluid tight seal at one end (34) of a non-metallic fluid impermeable Tube (19) is provided, woboi the non-metallic tube is sized so that there is a substantially tight, tight fit within the second Part (23) produces and protrudes from there into the first part. "2. Connection according to claim 1, characterized in that the second part (23) is a metallic one Comprises sleeve which is arranged with a slight sliding fit within a bore (26) through the first part (21) extends that a device (29) in the sleeve with the first part (21) for a limited Movement between these parts connects, and that between the sleeve (23) and the first part (21) a fluid sealing device (30) is arranged. 3. Connection according to claim 2, characterized in that that the means for connecting the sleeve (23) with the first part (21) comprises an annular part (29) which is arranged in opposing grooves (27, 28) is, of which a groove (28) on the inside of the bore (26) and the other groove (27) on the outside of the Sleeve (23) is arranged, with at least one of the two grooves in the axial direction of the first part one has a larger dimension than the ring part (29), with a limited one between the sleeve (23) and the first part (21) Axial movement is possible. 4. Connection according to one of claims 2 or 3, characterized in that the fluid sealing means comprises an elastomeric O-ring (30). 5. Connection according to one of claims 2 to 4, characterized in that the metallic sleeve (23) has one end which protrudes outward from the bore (26) 5, which end is so constructed and arranged net is that the metallic tube (18) is attachable thereto, said end of the sleeve from the first Part (21) protrudes. 6. Connection according to claim 5, characterized in that the outwardly facing end (40) of the sleeve (23) is constructed and arranged so that it protrudes from the first part, and that an indicator (41, 42, 43) on the sleeve near the protruding end (40) is provided to the correct Attachment to indicate when the connection is attached between two substantially fixed connection points is. 7. Connection according to one of claims 2 to 6, characterized in that a section (56) a non-metallic, fluid-impermeable tube within both the metallic sleeve (50) and a component part (21) is arranged, one end (34) of the section (56) on the inside of the component part (21) attached to it by means of a device (37) for attaching this component part is, and that the metallic sleeve (50) with a device for attachment to its interior with a fluid tight seal is provided at the opposite end of the section (56). 8. Fluid line arrangement with a connection accordingly One of the preceding claims, characterized in that the further element guiding a fluid is a fluid-impermeable element comprises solid metal tube which is attached at one end to the second part. -A- 9. flow means line arrangement according to claim 8, characterized characterized in that the second part (23) sits within the first part (21), and with the fluid sealing device arranged in between (30), and that both the fluid seal means and the non-metallic tube (19) are so constructed and arranged that both axial movement and angular movement are limited Scope between these two parts is allowed. 10. fluid line arrangement according to claim 8 or 9, characterized in that the non-metallic pipe (19) is made of a fluorocarbon resin is made and that its ends between the inner wall of the corresponding part and a respective one concentric, radially expanded insert (37) is squeezed. 11. Fluid line arrangement according to one of the claims 8 to 10, characterized in that the other element guiding a fluid is fluid-impermeable, solid metal pipe, and that the means having the first part for attaching the connector to that element at one end of the latter metallic tube is attached. 12. Fluid line arrangement according to one of claims 8 to 11, characterized in that that the non-metallic tube is an insert for the massj ve metallic pipe is and .from this in the first part protrudes to accommodate any movement between the first part and the metallic tube.