IE41796B1

IE41796B1 - Branch connection

Info

Publication number: IE41796B1
Application number: IE2003/75A
Authority: IE
Original assignee: Polva Nederland Bv
Priority date: 1974-09-13
Filing date: 1975-09-12
Publication date: 1980-03-26
Also published as: FR2284815B1; NL176883C; DE2540043A1; CH589250A5; CA1032199A; FR2284815A1; BE833318A; JPS5155028A; IT1047988B; NL7412153A; SE7510048L; ES440871A1; AU8468175A; GB1522165A; FI752536A7; IE41796L

Abstract

PURPOSE: To create an injected liquid and a source liquid area using a surface roughness. CONSTITUTION: The inner surface 2a of a nozzle 2 provided on a nozzle plate 1 is rough and the surface (the outer lateral surface of nozzle) is smooth. Thus wetting properties of a nozzle jet orifice is controlled by surface roughness. Therefore, the bending of an ink groove and air induction hardly occur, so that stable ink injection is obtained[JPS5155028A]

Description

The invention relates to a branch connection for connecting a branch pipe to a main pipe, the connection being of the kind which comprises a saddle-shaped part for mounting on the main pipe, said part being provided with an internally screw-threaded tubular member . integral with said saddle-shaped part and a tee piece for connecting the branch pipe, said tee piece comprising a tubular tapping member and a branch pipe receiving socket, the tubular tapping member having an external screw thread which engages with the aforementioned screw thread and a sealing member positioned between the inner surface of the . tubular member and the outer surface of the tee piece.

A branch pipe connection of the aforesaid kind is known. In the known branch pipe connection, in the mounted condition the screw threads on the inner wall of the tubular member and on the outer wall of the tee piece terminate at some distance from that end of the integral tubular . member which is remote from the saddle-shaped part. A sealing ring is located between the said end of the member and the termination of the screw thread.

In this construction the sealing ring may be accomodated in a recess formed - 2 in the wall of the tee piece.

The known branch connection is suitable for use in gas distribution networks but is unsuitable for water distribution networks, in particular if the water flowing through the pipes has a high hardness. Under these . conditions calcium carbonate can deposit between the screw threads so that the position of the tee piece relative to the pipe will become more or less fixed, because the relative mobility of these parts is entirely or largely lost. This may be a disadvantage when soil movements occur in the ground, because stresses in the pipes may give rise to leakages. The . said fixation may also be a disadvantage when work is to be done in the ground on or near the relevant distribution network. In doing such work the exertion of forces on the pipes must be avoided.

According to the present invention there is provided a branch connection for connecting a branch pipe to a main pipe which comprises . a saddle-shaped part for mounting on the main pipe, said part being provided with an internally screw-threaded tubular member integral with said saddle-shaped part and a tee piece for connecting the branch pipe, said tee piece comprising a tubular tapping member and a branch pipe receiving socket, the tubular tapping member having an external screw . thread which engages with the aforementioned screw thread and a sealing member positioned between the inner surface of the tubular member and the outer surface of the tee piece, characterized in that the sealing member is located in a circumferential recess formed in the wall of the tee piece, said recess being positioned between the end of the screw thread and the end . of the tee piece which ends when in use are the ends nearest to the main pipe so as to engage a sealing surface formed by a circumferential part of the inner wall of the tubular member. - 3 41796 In the branch pipe connection the fluid which flows through the pipes, for example water, cannot come into contact with the screw-threads.

A layer of calcium carbonate deposited on that part of the sealing member which contacts the water cannot block motion of the tee piece relative to 5' the tubular member. The sealing member may be disposed in a circumferential recess in the wall of the tee piece and engages a sealing surface formed on the opposite wall. This prevents the sealing member from being pushed out from between the walls of the 10. tubular member and the tee piece when the latter is inserted into the body or when, in the mounted state, the position of the branch pipe relative to the main pipe is changed.

The tee piece comprises the tubular tapping member and the branch receiving socket and the tapping member in the mounted state extends . substantially at right angles to the main pipe. The tubular tapping member is provided at one end with the circumferential recess which accomodates the sealing member, for example a sealing ring, and with the external screw thread, and at the other end may be provided with a opening which can be closed with a closure member. The branch pipe receiving socket may be . integral with the tubular tapping member and may be located at the end remote from the tubular member so that the pipe receiving socket can be readily connected to a branch pipe (service pipe). An opening can be cut in the main pipe by means of a tapping tool which can pass through an opening for a closure member at the end of the tubular tapping member, which tubular . tapping member in the mounted state is substantially at right angles to the pipe. The length of the circumferential sealing surface which is formed by the .part of the inner wall of the tubular member integral with the saddle-shaped pare and engages the sealing member is such that when the final- insertion posit ion is reached by screwing the'tubular tapping member into said tubular member, - 4 41796 the tubular tapping member can be rotated through 360 degrees without the sealing member leaving the sealing surface. Thus, the tubular tapping member can be unscrewed from the tubular member at least through 360°. without the sealing member leaving the sealing surface.

. In an embodiment which has proved of advantage in practice the outer wall of the tubular tapping member, which member in the mounted state is arranged substantially at right angles to the pipe, is provided, at some distance from that end which during the mounting operation faces the saddleshaped part, with a collar which, when inserted into the tubular member . integral with the saddle-shaped part, falls within a recess formed in the rim of that end of the tubular member which is remote from the saddleshaped part. The depth of the recess in the rim of the tubular member may be at least equal to the length of the sealing surface which engages the sealing member, so that the tubular tapping member may be rotated . when in its final inserted position, through an angle of 360° without the collar being disengaged from the recess. This construction provides the advantage that sand or other soil constituents cannot readily find their way between the inner wall of the tubular member integral with the saddleshaped part and the outer wall of the tubular tapping member mounted therein . by means of the screw threads. The branch pipe receiving socket of the tee piece can be connected to a branch pipe in any manner known in the art.

The sealing member may be an 0-ring made of an elastically compressible material, for example natural rubber or a rubber-like synthetic material. The saddle-shaped part and the other parts of the branch connection are made of . materials suitable for their particular functions. Suitable materials are, for example, cast iron, polypropylene, polyvinylchloride, polyoxymethylene.

One advantage of the present branch connection construction is that the screwed connection between the tee piece and the tubular member is not loaded - 5 41796 by the internal pressure of the fluid in the pipe so that at the location of the screw threads, at least for the tubular member integral with the saddle-shaped part, a smaller material thickness can be used as compared .with a construction in which such screwed connection would be subjected . to this pressure.

Another advantage of the present branch connection construction is that in using the tee piece the position of the branch receiving socket relative to the pipe can be chosen at will so that under any circumstances the most advantageous position can be selected. For example, when a branch pipe . made of a comparatively rigid material is used the branch receiving socket may have to be arranged parallel to the main pipe and to be connected to the branch pipe via a bend. A change in the position of the branch pipe relative to the main pipe then will not give rise to stresses in the connection, provided the latter permits rotation.

. An embodiment of the invention will now be described, by way of example, with reference to the accompanying diagrammatic drawing, the single figure of which shows the branch connection in part cross-sectional view.

The figure shows a main pipe 1 made of a synthetic resin material . on which saddle-shaped parts 4 and 5 are secured by means of closure members or clamps 2 and 3. A tubular member 6 is integral with the saddle-shaped part 4. It is provided with a screw thread 7A in its inner wall, and its end remote from the pipe 1 is formed with a recess 8A.

The tee piece comprises a tubular tapping member 9 which at the end . remote from the pipe 1 is closed hy a closure cap 9A screwed on to it. At its end facing main pipe 1 tubular tapping member 6 is provided with a screw - 6 41796 thread 7B which engages with the screw thread 7A. The said end is formed with a recess 10 in which the sealing member in the form of an O-ring 11 is accomodated. Tubular tapping member 9 has a collar 8B which when the tapping member 9 is screwed into the tubular member 6 is entirely or . partly received in the recess 8A. The provision of the collar 8B prevents soil particles from finding their way between the screw threads 7A and 7B when the branch connection is buried. The depth of the recess 8A is at least equal to the length of the path which the sealing member 11 travels along a sealing surface 14 when the tubular tapping member . 9 is rotated through 360° from the final position so that the collar 8B does not leave the recess 8A. Tubular tapping member 9 has a branch receiving socket 12 for connection to a branch pipe. The branch connection can be secured to main pipe 1 in the following manner: The saddle-shaped parts 4 and 5 are secured to the pipe 1 by means . of the clamps 2 and 3. Then the tubular tapping member 9 is secured in the tubular member 6. After the branch pipe has been secured to socket 12 a tapping tool (a milling cutter or the like, not shown), which may be a permanent fixture, is inserted through the opening adapted to he closed by the cap 9A to cut an opening 13 in main pipe 1. After removal of the . tool, if desired, the tubular tapping member 9 is closed by screwing on the cap 9A.

Claims

1. I. A branch connection for connecting a branch pipe to a main pipe, which comprises a saddle-shaped part for mounting on the main pipe, said part being provided with an internally screw-threaded tubular member integral with said saddle-shaped part and a tee piece for connecting the 5. branch pipe, said tee piece comprising a tubular tapping member and a branch pipe receiving socket, the tubular tapping member having an external screw thread which engages with the aforementioned screw thread and a sealing member positioned between the inner surface of the tubular member and the outer surface of the tee piece, characterized in that the 10. sealing member is located in a circumferential recess formed in the wall of the tee piece, said recess being positioned between the end of the screw thread and the end of the tee piece which ends when in use are the ends nearest to the main pipe so as to engage a sealing surface formed by a circumferential part of the inner wall of the tubular member. 15.

2. A branch connection for a pipe as claimed in Claim 1, characterized in that the tee piece comprising the tubular tapping member and the branch pipe receiving socket is provided substantially at one end with the recess in which the sealing member is accommodated and at the other end, with a second external screw thread terminating in an opening with a closure 20. member, and in which the branch pipe receiving socket is integral with the tubular tapping member intermediate from the ends thereof.

3. A branch connection as claimed in Claim 2, characterized in that the length of the circumferential sealing surface which is formed by the part of the inner wall of the tubular member integral with the saddle-shaped part and engages 25. the sea 1ing member is such that, when the final inserted position is reached oy screwing the tubular tapping member into said tubular member, the - 8 41796 tubular tapping member can be rotated through 360 degrees without the sealing member leaving the sealing surface.

4. A branch connection as claimed in Claim 3, characterized in that the outer wall of the tubular tapping member is urovided with a collar which when 5. this tubular tapping member is inserted into the tubular member integral with the saddle-shaped part falls within a recess formed in the rim of that end of the tubular member, which is remote from the saddleshaped part.

5. A branch connection as claimed in Claim 4, characterized in that 10. the depth of the recess formed in the rim of that end of the tubular member integral with the saddle-shaped part which is remote from this part is at least equal to the length of the sealing surface which engages tne sealing member.

6. A branch connection for a pipe substantially as hereinbefore described 15. with reference to the accompanying drawing.