FR2888307A1 - FITTING FOR VALVES. - Google Patents

Abstract

The fitting connection (1) is intended for the fixed connection of a pipe (2) with a fitting (4), for example. ex. pipe sleeve, valve or valve body, fittings, etc. comprising a pipe adapter (5) and a collar adapter (6) connectable to the adapter (5) and a connecting pipe (9) housed in the through-holes of the adapter (5) and the adapter to collar (6), and a seal (11) at least housed in a connection area (10) of the adapter (5) with the adapter (6). The connecting pipe (9) is provided with a flange ring (31) projecting at the outer periphery of the connecting pipe (9), and in the adapter (5) and / or the collar adapter (6). is disposed an annular receiving housing receiving the flange ring (31) and the seal (11) .L'invention is applicable in particular in the field of the valve.

Description

- 1 -

  The invention relates to a fitting for valves for the fixed connection of a pipe with a valve p. ex. pipe sleeve, valve or valve body, fittings, etc. comprising a pipe adapter and a collar adapter connectable to the pipe adapter and a connecting pipe housed in the through holes of the pipe adapter and the collar adapter protruding above the adapter to collar with a pointed end and with at least one seal housed in a connection area of the hose adapter with the collar adapter.

  In the state of the art, there are known fittings for a removable connection of plastic pipes with valves or adapters, the pipe to be connected by means of an adapter is surrounded by an olive connection which cooperates with an annular groove in the adapter and, when threaded with the adapter, engages, forming a sharp circular edge, in the wall of the pipe by means of a wrench that surrounds the pipe as well as the olive fitting , and secures the hose in the adapter tightly and protects it against tearing force.

  The object of the invention is to provide a pipe adapter for a fixed connection of pipe with a fitting which ensures a connection of the pipe to the adapter, tear-resistant and watertight, by means of a simple assembly.

  This object of the invention is achieved in that the connecting pipe in the connection area of the pipe adapter with the collar adapter is provided with a flange ring projecting from the outer periphery of the connecting pipe and that in the pipe adapter and / or the collar adapter is disposed an annular receiving housing receiving the flange ring and the seal. The unexpected advantage is that the connecting pipe with the flange ring is securely pressed into the receiving housing between the pipe adapter and the collar adapter and that a high holding force is opposite to a possible tearing force, likely to appear in a segment of the pipe.

  According to advantageous embodiments, the invention may also comprise at least one of the following features: - an annular abutment surface of the receiving housing facing the flange ring of the connecting pipe, constitutes with an annular abutment surface of the flange ring, facing the latter, a stop against tearing for the connecting pipe, which makes it possible to obtain an exact axial transfer of the tearing force on the collar adapter; - The abutment surfaces are arranged in a plane perpendicular to a longitudinal median axis, which allows a simple geometry of the tools for manufacturing, in particular injection tools; the abutment surfaces are formed as conical assembly surfaces of a truncated cone with an acute angle of between 150 and 175, which makes it possible to economize on all the retaining sleeves intended to prevent the removal of the connection in the presence of a pulling force; the hose adapter is connected to the collar adapter with a friction weld resulting in a durable connection with high strength; in the connection zone, the pipe adapter and the collar adapter are flanged; the opposite end surfaces form a ring-shaped circular male-to-male-fit assembly, and thus the contact surface is enlarged in the connection area of the pipe adapter by means of the collar adapter and the this gives a high resistance; - The receiving housing is disposed in the collet adapter, and one obtains exact prior positioning of the connecting pipe in the collar adapter for the execution of the connection operation; a height of the flange ring protruding above the outer periphery of the connecting pipe is equal to or greater than a wall thickness of the connecting pipe, which reliably prevents tearing of the connecting pipe; a width of the receiving housing is slightly greater than a width of the flange ring, and thus axial clearance is obtained which logically leads to cooperation between the connecting surfaces of the pipe adapter and the collar adapter for the connection operation; - The seal is arranged on the connecting pipe by surrounding the flange ring circumferentially, and thus a reliable seal is obtained both radially and axially by means of a seal; - The seal is made by an O-ring, so standard seals are used; the flange ring is provided at one periphery, surrounding it, with a retaining groove for the seal, the mounting being simplified by the prior positioning of the seal, and the mounting errors are effectively prevented; - the connecting pipe engages in the opening bore of the pipe adapter, and thus the bending forces acting on the connecting pipe are considerably reduced as to their effect on the connection between the adapter hose and collar adapter; A depth of penetration of the connecting pipe into the pipe adapter is limited by the abutment element protruding above an inside diameter of the bore opening from the pipe adapter, in the direction of the longitudinal median axis; the stop element is formed by a stop ring; on an outer periphery of the pipe adapter are formed boss surfaces for a tool, and thus the mounting dimension, i.e., total length of the valve fitting, has been precisely defined; - An area of the outer periphery of the pipe adapter is shaped polygon, and therefore standard tools can be used for mounting the fitting for valves; an end zone of the pipe adapter is provided with a thread; an end zone of the pipe adapter is tapped; the pipe adapter has a flange in the end area, which allows for universal application of the valve fitting in various installation applications; - in the connection pipe is fitted a friction-driven retaining bush, thus obtaining additional protection against bending forces in the connection pipe and by means of which the existing high safety requirements can be fulfilled, particularly in the case of implementation of a pipe junction or a pipe connection in a gas channeling zone; the hose adapter is provided on a front surface facing the receiving housing of the collar adapter with a clamping ring, which makes it possible to obtain a tight fit of protection of the seal in the reception accommodation; - Between the flange ring of the connecting pipe and the collar adapter is provided a holding device for a wall of the connecting pipe; the holding device consists of an undercut groove in a front surface of the flange ring, opposite to the receiving housing, and a retaining ring of the collar adapter cooperating with the groove. against undercut, and thus the removal of the connection pipe and thus the risk of leakage of the valve connection are effectively prevented. In many cases, therefore, the use of a retaining sleeve in the connection pipe can be dispensed with; the hose adapter, the connecting pipe and the collar adapter are preferably made of plastic, which allows economical manufacture, in particular suitable for mass production; the connecting pipe is preferably made of polyethylene, and therefore a material already appreciated with reliable welding properties can be used; the pipe adapter is integrally formed on the fitting, eg. ex. valve body, support collar, etc. A direct connection, according to the embodiment according to the invention, is already obtained to connections prepared for an installation of this type, without the use of screwed adapters, rings, etc. additional.

  The invention will be better understood and other objects, features, details and advantages thereof will appear more clearly in the following explanatory description made with reference to the accompanying schematic drawings given solely by way of example illustrating several modes. embodiment of the invention and in which: FIG. 1 a fitting for valves according to the invention in profile view, in section; - fig. 2 a detailed view of the fitting for plumbing according to fig. 1; - fig. 3 another embodiment of the fitting for fittings on a body; - fig. 4 a new embodiment of the fitting for fittings on a body; - fig. Another embodiment of the fitting for valves; - fig. 6 a detailed view of a connection area of the fitting for valves; - fig. 7 another embodiment of the fitting for valves, in section; - fig. 8 another embodiment of the fitting for valves, in section.

  Let us mention as a preliminary that in the various embodiments described, the identical parts are designated by the same reference numerals or the same part descriptions, the presentations contained throughout the description being able to be transposed by analogy to the identical parts bearing the same parts. numerical references or designations of identical parts. Likewise, the positional indications chosen in the description, such as p. ex. top, bottom, side, etc. also refer to the figure directly described and shown and must in case of change of position, be transposed by analogy to the new position. Individual characteristics or combinations of features apparent from the embodiments shown and described may further represent clean, creative solutions or according to the invention.

  In figs. 1 and 2 is shown a fitting for valve 1 in support of the example of a connection of a pipe 2, in particular of a plastic pipe 3 to a valve 4, eg accessory, body, support collar, etc. The fitting for fitting 1 consists of a hose adapter 5 which can be connected to the fitting 4, a collar adapter 6 connected to the hose adapter 5 and a connecting hose 9 housed in the through bores 7,8 of the pipe adapter 5 and the collar adapter 6 and at least one seal 11, p. ex. an O-ring (12) housed in a connection zone 10.

  The pipe adapter 5 is a hollow cylindrical machined part which, according to the embodiment shown, is provided with a thread 14 in an end zone 13. A flange is formed by forming in an opposite end zone 15. The flange 16 presents , on a front surface 17 of annular shape facing the collar adapter 6, a male engagement 18 projecting therefrom, circular ring-shaped, substantially trapezoidal section.

  The annular body 6 is also provided with a flange 19, opposite to the flange 16. In an annular front surface 20 is disposed a groove 21 housing the male fitting 18 of the pipe adapter 5.

  This embodiment allows a very solid and centered connection between the pipe adapter 5 and the collar adapter 6.

  The through-bores 7,8 of the pipe adapter 5 and the collar adapter 6 have the same internal diameter 22 and this substantially corresponds to the outside diameter 23 of the connecting pipe 9 housed in the bores opening 7,8. . Said connecting pipe protrudes above a penetration depth 24 in the pipe adapter 5 and above the collar adapter 6 in an opposite end zone 25 and forms with this end zone 25 what the a pointed end 26 is designated for the connection of the pipe 2. The penetration depth 24 is limited by abutment elements 28 projecting above the inside diameter 22 of the pipe adapter 5 in the direction of an axis longitudinal median 27, for example by studs machined and regularly distributed on the inner periphery. However, it is also possible to make the stop element 28 in annular form, the projection 29 overhanging the inner diameter 22 in the direction of the longitudinal median axis 27 preferably not being greater than a wall thickness 30 of the pipe connection 9.

  For protection against tearing of the connecting pipe 9, said pipe is provided with a flange ring 31 in the region of the collar adapter 6 and the collar adapter 6 has an annular receiving housing 32 for receiving the flange ring 31 in the through bore 8. An inner diameter 33 corresponds approximately to an outer diameter 34 of the flange ring 31. A height 35 of the flange ring 31 is substantially equal to or greater than the wall thickness 30 of the connecting pipe 9. The flange ring 31 bears with an annular abutment surface 36, on an abutment surface 37 of the receiving housing 32, opposite to said abutment, an area 38 consisting of by the abutment surfaces 36, 37, according to the present embodiment, being directed vertically with respect to the longitudinal central axis 27.

  Thus, a pulling force exerted substantially on the valve connection 1 - according to the arrow 39 - is absorbed by the fitting for valve 1.

  On the periphery, on the flange ring 31 is arranged the seal 11 and with a further step in the opening bore 8 of the collar adapter 6 is provided an annular groove 40 for the seal 11 A section of the groove 40 is slightly smaller than the maximum dimension of the section of the seal 11, allowing tight fitting in the groove 40 to achieve a reliable sealing effect.

  The connection of the hose adapter 5 to the collar adapter 6, in the connection zone 10 having the male interlock 18 and the groove 21, is preferably performed by means of a friction welding operation. . However, a collage is naturally possible.

  As is apparent from FIG. 1, it is intended to connect the pointed end 26 of the connecting pipe 9 to the pipe 2 by means of a butt welding operation, in particular by end-reflector welding, known for this application in the state of the art.

  As also shown by the dotted lines in fig. 2, it is of course also possible to machine in the end zone 13 of the pipe adapter 5, instead of the male thread 14, a flange 41 for connection to the valve 4, p. ex. valve body, valve body, support collar, etc. A type of attachment to the fitting for a similar valve 1 could consist of providing instead of a collar 41 surrounding the cylindrical end zone 13, a plurality of fastening tabs distributed around the periphery.

  The latest embodiments described with the flange 41 or with fastening tabs are however more expensive compared to the embodiment with a tool for the injection operation of the plastic pipe adapter 5.

  The realization of the connection zone 10 with the male fitting 18 on the pipe adapter 5 and the groove 21 on the collar adapter 6 is one of the many other possibilities of enlarging the contact surfaces between them. to obtain a high solidity and simultaneously, to center the parts between them, that is to say to reach an exact alignment of the axes. Other embodiments of the contact surfaces are naturally also conceivable. For the friction welding connection method, however, a symmetrical axis embodiment is required, since this type of operation requires both a welding pressure and a relative movement between the connecting surfaces and in this case this is done concretely by a relative rotational movement of the parts between them.

  Fig. 3 now shows another embodiment of the valve fitting 1. According to this embodiment, the pipe adapter 5 is machined in one piece on a body 42, p. ex. a valve body 43 of a shut-off valve. This type of embodiment allows the direct connection of the pipe 2 by means of the connection pipe 9 and its locking between the pipe adapter 5 machined on the body 42 and the collar adapter 6, with the aid of the flange ring 31 positioned in the receiving housing 32 of the collar adapter 6. Making the connection zone 10 with the receiving housing 32 for the flange ring 31 and the arrangement of the seal 11 corresponds to the exemplary embodiments already described in the previous figures.

  In fig. 4 is shown by way of example, another embodiment of the fitting for valve 1 in which the pipe adapter 5 is machined directly on a body portion 44 of a support collar 45.

  An embodiment of this type is more particularly suitable for directly connecting the pipe 2 by placing the body portion 44 on a supply pipe 46 in the wall of the pipe which is created a passage. The following embodiment of the collar adapter 6, a connecting pipe 9 with flange ring and seal, corresponds to the examples already described above.

  In fig. 5 shows another embodiment of the fitting for fittings 1. According to this embodiment, the hose adapter 5 has in the end zone 15, a tarauadage 47 for connection to a valve. To limit the penetration depth 24 of the connecting pipe 9, the abutment element 28 has been designed as an abutment ring 48, according to the present embodiment.

  The realization of the connection zone 10 between the pipe adapter 5 and the collar adapter 6 with holding the connecting pipe 9 by means of a flange ring 31 and a seal 11 surrounding the flange ring 31 corresponds to the embodiments described in the previous examples.

  On the other hand, this exemplary embodiment shows a possibility of connection welded between the connecting pipe 9 and the pipe 2, by means of a welding sleeve 49 surrounding the pointed end 26 and the pipe 2, in the zone d a location of the seal 50. The solder sleeve 49 is provided with resistance wires 51 which can be supplied with electric current. Thanks to the temperature that can thus be obtained, a fusion is achieved with formation of a welding layer 52 between the inner wall of the welding sleeve 49 and the outer wall of the connecting pipe 9 or between the pointed end 26 and the channel 2. FIG. 5 also shows that in the connecting pipe 9, a holding bush 53, in particular a thin-walled metal bushing, is projected above the connection zone 10. With the latter, the radial withdrawal of the connecting pipe 9 in the direction of the longitudinal median axis 27 in the presence of a pulling force - according to arrow 54 is effectively prevented, therefore, even in the presence of forces d upper tearing - according to arrow 54-, the flange ring 31 does not detach from the receiving housing 32 in the collar adapter 6.

  In fig. 6 is shown another embodiment of the fitting for valve 1, relating to the connection zone 10 between the pipe adapter 5 and the collar adapter 6.

  This improvement concerns in particular the realization of the flange ring 31 of the connecting pipe 9 as well as of the receiving housing 32 and the arrangement of the seal 11. According to this embodiment, the abutment surfaces 36, 37 are arranged along the flange ring 31 and the receiving housing 32, in the form of conical mounting surfaces, concentric with respect to the longitudinal central axis 27, of a truncated cone, comprising lines of conical assembly imaginary on the longitudinal median axis 27 at the intersection point 55, said cone being offset with respect to the flange ring 31, in the opposite direction to the tearing force exerted, according to -flèche 54 -. In the presence of the tearing force - according to arrow 54 -, this results in a force component exerted in a radial direction along arrow 56 on the flange ring 31, effectively preventing the withdrawal of the connecting pipe. 9 in the direction of the longitudinal median axis 27. An acute angle 57 of the imaginary cone preferably measures from 150 to 170 approximately.

  As can be seen from fig. 6, the flange ring 31 is circumferentially provided with a holding groove 58 formed by a circular cavity for positioning the O-ring 12. The collar adapter 6 has a sealing surface 59 facing the O-ring 12 , corresponding substantially to the circular section of the O-ring 12. The dimensions must however be adapted to a tight fitting of the O-ring 12, in order to obtain a high sealing effect of the O-ring 12.

  In fig. 7 is shown another embodiment of the valve fitting 1 with the connection zone 10 between the pipe adapter 5 and the collar adapter 6 sealingly connecting the connecting pipe 9 with the pipe adapter 5 by means of A seal 11. The connection of the hose adapter 5 with the collar adapter 6 is preferably effected, as already described in the preceding figures, by means of friction coupling the male socket 18 of the collar 16 of the pipe adapter 5 to the groove 19 of the collar adapter 6. The connecting pipe 9 is held in the collar adapter 6 by means of the ring in the receiving housing 32, and as already described in the previous figure, is radially protected, against tearing of the wall of the pipe in the direction of the longitudinal median axis 27, by means of the surfaces stopper 36, 37 of truncated conical shape, available On the opposite side, extending at the acute angle 57. In the receiving housing 32, the seal 11 is pressed against opposing annular end surfaces 60, 61 of the flange ring 31 and the pipe adapter 5, the end surface 61 of the pipe adapter 5 being provided, projecting above said front surface in the direction of the end surface 60 of the flange ring 31, with a ring of clamping 62 which exerts on the seal 11, a preload for a safe sealing of the connection zone 10.

  In fig. 8 is shown another embodiment of the flange ring 31 of the connecting pipe 9 of the fitting 1, in order to obtain a holding effect before removal of the wall of the pipe in the direction of the longitudinal central axis 27 , the connection zone 10 between the pipe adapter 5 and the collar adapter 6, as well as the receiving housing 32 and the arrangement of the seal 11 corresponding to the figure previously described.

  In this embodiment of a holding device 63, to obtain a holding effect of the wall of the connecting pipe 9, the flange ring 31 is provided with an undercut groove 65 on a front surface 64 opposite to the seal 11.

  The collar adapter 6 has a holding ring - 14 - 66 cooperating with the undercut groove 65 and engaging in the undercut groove 65 after the connection of the pipe adapter 5 and the collar adapter 6. A withdrawal of the wall of the connecting pipe 9 - according to arrow 67 - is thus effectively prevented, even in the presence of high tensile stresses, oriented in the axial direction, between the pipe adapter 5 and the pipe connection 9.

  Note also that the appropriate material used for the elements of the fitting for valve 1 is the plastic and for the connecting pipe 9 preferably polyethylene. These materials are easy to machine, offer high strength, can be used in a wide range of temperatures and are insensitive to various active ingredients.

  The exemplary embodiments show possible variants of embodiment of the fitting for valve 1, while noting however here that the invention is not limited to the special embodiments presented, but that on the contrary, it is possible to combine the different variants and that this possibility of variation, resulting from the practical training of the technique underlying the present invention, is reserved for the know-how of those skilled in the art operating in this technical sector. Therefore, also included in the protection, all conceivable embodiments resulting from the combination of different details of the embodiment shown and described.

  For the good shape, let us mention finally that for the better understanding of the design of the fitting for tapware 1, the latter as well as its constituents have been partly represented on another scale and / or enlarged and / or reduced.

  The task behind creative solutions

  own can be deduced from the description.

  In particular, the different embodiments shown in FIGS. 1, 2; 3; 4; 5; 6; 7, 8 may be the subject of clean solutions, according to the invention. The tasks and solutions relating to said solutions according to the invention must be deduced from the

  detailed descriptions of these figures.

  - 16 - Nomenclature of the characteristic marks 1 Fitting for 41 Fitting collar 42 Body 2 Channel 43 Valve body 3 Plastic pipe 44 Body part 4 Fitting 45 Clamp pipe adapter Hose 46 Line 6 Clamp adapter 7 Opening bore 47 Female thread 8 Through bore 48 Thrust ring 9 Connection pipe 49 Welding sleeve Connection area 50 Gasket location 11 Gasket 51 Resistance wires 12 O-ring 52 Welding layer 13 Terminal area 53 Retaining sleeve 14 Thread male 54 Arrow End zone 55 Intersection point 16 Collar 56 Arrow 17 Front surface 57 Sharp angle 18 Male interlocking 58 Holding groove 19 Collar 59 Joint surface Terminal area 60 Front surface 21 Groove 61 Front surface 22 Inside diameter 62 Clamping ring 23 Outer diameter 63 Holding device 24 Depth of 64 Front surface penetration 65 Undercut end slot 24 Pointed end 66 Retaining ring 27 Longitudinal mid-axis 28 Stop element 29 Projection Wall thickness 31 Flange ring 32 Receiving housing 33 Inside diameter 34 Outside diameter Height 36 Stop surface 37 Stop surface 38 Zone 39 Groove Arrow

Claims (1)

17 CLAIMS   1. Fitting for taps (1) for the fixed connection of a pipe (2) with a tap (4) p. ex. pipe sleeve, valve or valve body, fittings, etc. comprising a pipe adapter (5) and a collar adapter (6) connectable to the pipe adapter (5) and a connecting pipe (9) housed in the through holes (7,8) of the pipe adapter (5) and the collar adapter (6) projecting above the collar adapter (6) with a pointed end (26) and with at least one seal (11) housed in a connection zone (10) of the pipe adapter (5) with the collar adapter (6), characterized in that the connecting pipe (9) in the connecting region (10) of the pipe adapter (5) with the collar adapter (6) is provided with a flange ring (31) projecting at the outer periphery of the connecting pipe (9) and in the pipe adapter (5) and / or the adapter to collar (6) is arranged an annular receiving housing (32) receiving the flange ring (31) and the seal (11).   Fitting for a fitting (1) according to claim 1, characterized in that an annular abutment surface (37) of the receiving housing (32) facing the flange ring (31) of the connecting pipe ( 9), forms with an annular abutment surface (36) of the flange ring (31), facing it (37), a stop against tearing for the connecting pipe (9).   Valve connection (1) according to claim 2, characterized in that the abutment surfaces (36, 37) are arranged in a plane (38) perpendicular to a longitudinal central axis (27).   Valve connection (1) according to Claim 2, characterized in that the abutment surfaces (36, 37) are formed as conical connecting surfaces of a truncated cone with an acute angle (57) of between 150 and 175   Valve connection (1) according to claim 1, characterized in that the pipe adapter (5) is connected to the collar adapter (6) by friction welding.   Valve connection (1) according to claim 1, characterized in that in the connection zone (10) the pipe adapter (5) and the collar adapter (6) are flanged.   Valve connection (1) according to claim 6, characterized in that the opposite end surfaces (20) form a ring-shaped circular male groove connection.   Valve connection (1) according to claim 1, characterized in that the receiving housing (32) is arranged in the collar adapter (6).   Connection fitting (1) according to claim 1, characterized in that a height (35) of the flange ring (31) projecting above the outer periphery of the connecting pipe (9) is equal to or greater than a wall thickness (30) of the connecting pipe (9).   Valve connection (1) according to one of claims 1 or 8, characterized in that a width of the receiving housing (32) is slightly greater than a width of the flange ring.   Valve connection (1) according to claim 1, characterized in that the seal (11) is arranged on the connecting pipe (9) surrounding the flange ring (31) circumferentially.   Valve connection (1) according to Claim 11, characterized in that the seal (11) is formed by an O-ring (12).   Valve connection (1) according to one of claims 11 or 12, characterized in that the flange ring (31) is provided at one periphery, in the surrounding area, with a holding groove (58). for the seal (11).   Valve connection (1) according to Claim 1, characterized in that the connecting pipe (9) engages in the through bore (7) of the pipe adapter (5).   Valve connection (1) according to Claim 14, characterized in that a penetration depth (24) of the connection pipe (9) in the pipe adapter (5) is limited by the stop element ( 28) protruding above an inner diameter (22) of the through bore (7) of the pipe adapter (5) in the direction of the longitudinal center axis (27).   16. Fitting connection (1) according to claim 15, characterized in that the stop element (28) is formed by an abutment ring (48).   Valve connection (1) according to Claim 1, characterized in that boss surfaces for a tool are formed on an outer periphery of the pipe adapter (5).   Valve connection (1) according to claim 17, characterized in that a region of the outer periphery of the pipe adapter (5) is polygonal in shape.   19. Fitting connection (1) according to claim 1, characterized in that an end zone (13) of the pipe adapter (5) is provided with a thread (14).   20. Fitting connection (1) according to claim 1, characterized in that an end zone (15) of the pipe adapter (5) is provided with a tapping.   Valve connection (1) according to claim 1, characterized in that the pipe adapter (5) is provided with a flange (41) in the end zone (13).   22. Fitting connection (1) according to claim 1, characterized in that a friction-holding retaining sleeve (53) is accommodated in the connecting pipe (9).   Valve connection (1) according to one of the preceding claims, characterized in that the pipe adapter (5) is provided on a front surface (61) facing the receiving housing (32) of the adapter collet (6), a clamping ring (62).   Valve connection (1) according to Claim 1, characterized in that between the flange ring (31) of the connecting pipe (9) and the collar adapter (6) is provided a holding device ( 63) for a wall of the connecting pipe (9).   Connection fitting (1) according to claim 24, characterized in that the retaining device (63) consists of an undercut groove (65) in a front surface (64) of the flange ring (31), opposite to the receiving housing (32), and a retaining ring (66) of the collar adapter (6), cooperating with the groove groove (65).   Valve connection (1) according to claim 1, characterized in that the pipe adapter (5), the connecting pipe (9) and the collar adapter (6) are preferably made of plastic.   27. Valve connection (1) according to claim 26, characterized in that the connecting pipe (9) is preferably made of polyethylene.   28. Fitting connection (1) according to claim 1, characterized in that the pipe adapter is integrally formed on the fitting, e.g. ex. valve body, support collar, etc.