AU729577B2 - Internally divided water pipe and diverter valve therefor - Google Patents

Description

WO 99/51905 PCT/AU98/00233 INTERNALLY DIVIDED WATER PIPE AND DIVERTER VALVE THEREFOR FIELD OF THE INVENTION This invention relates to an internally divided water pipe and/or to a diverter valve which can be attached thereto. The invention will be described with reference to its use in water irrigation, but it should be appreciated that the pipe can be used for other liquids, or even fluids.

BACKGROUND ART In crop irrigation, long pipes are laid to convey water from a water supply to the field. The pipe can be one or more kilometers long and water outlets are spaced along the pipe. Smaller diameter hoses can be attached to the outlets and irrigation equipment can be attached to the hose.

These long pipes are also called 'flumes". It is known to have flexible flumes which can be made from a rubberised canvas, flexible plastic, and the like. These flumes can be flattened and rolled up when not in use.

One current disadvantage with these extremely long pipes is that it is time consuming to open and close the various valves spaced along the length of the pipe, it being appreciated that the pipe can be several kilometers long.

OBJECT OF THE INVENTION The present invention is directed to a pipe which can replace current pipes or flumes and where the fluid outlets or valves can be turned off from a central location without having to separately turn off each valve along the pipe.

The present invention is also directed to a diverter valve that can achieve this function.

It is an object of the invention to provide a pipe and/or a diverter valve which may overcome the abovementioned disadvantages and provide the public with a useful or commercial choice.

In one form, the invention resides in a pipe to convey a fluid, the pipe having at least one fluid outlet along its length, the pipe having an internal flexible longitudinal dividing wall which can move between a first flow position where fluid can pass along the pipe and through the said fluid outlet and a WO 99/51905 PCT/AU98/00233 2 second position where fluid is unable to pass through the at least one outlet.

In this manner, the internal flexible dividing wall can be made to move between its first flow position where water can pass along the pipe and through one or more of the fluid outlets, and a second flow position where water can pass along the pipe but is prevented from passing through one or more of the outlets.

The internal dividing wall can be made to move between its positions by diverting water along one or the other side of the internal flexible dividing wall. If water is passed along one side of the dividing wall, the wall will allow water to pass through the outlets, while if the water is passed along the other side of the dividing wall, water is prevented from passing through the outlet.

The pipe can be made flexible such that it can adopt a "lay flat" configuration when not in use. The pipe can be made from any suitable material which can include polyethylenes, polypropylenes, laminated plastics, rubberised canvas, and the like. Of course, a rigid or substantially rigid pipe can also be used.

The pipe has at least one fluid outlet and preferably includes a number of outlets spaced along the pipe. These outlets may be fitted with stop valves and various coupling arrangements can be present to couple irrigation equipment to the pipe.

The internal dividing wall is flexible, and can be either flexible but substantially inextensible, or flexible and extensible (such that the internal dividing wall can stretch if required).

An advantage with having the internal wall flexible as opposed to rigid is that the wall can flex from one side of the pipe to the other side of the pipe. This means that when fluid flows along one side of the wall, the wall flexes such that almost the entire internal diameter of the pipe can be used. If the wall was rigid, this would result in an undesirable reduction in the available flow of water.

The internal wall can be formed by manufacturing a tube of flexible WO 99/51905 PCT/AU98/00233 3 pipe and attaching to the outside of the tube a longitudinal wall (an embodiment of which is illustrated in Figure 3).

To move the internal wall, a diverter valve can be provided, and in another form of the invention, there is provided a diverter valve attachable to a pipe of the type having an internal flexible longitudinal dividing wall which can move between a first flow position where fluid can pass along the pipe and through the said fluid outlet and a second position where fluid is unable to pass through the outlet, the valve having a valve member which is attachable to an end of the dividing wall and which can move the end of the dividing wall between opposed sides of the pipe, thereby allowing fluid to selectively pass along each side of the dividing wall.

The diverter valve can pull an end of the dividing wall between upper and lower positions which divert water into each side of the pipe.

BRIEF DESCRIPTION OF THE DRAWINGS An embodiment of the invention will be described with reference to the following drawings in which Figure 1 illustrates a pipe having an internal wall which has been moved to one side of the pipe to allow water to pass through the pipe and through a series of outlets spaced along the pipe.

Figure 2 illustrates the pipe of Figure 1 where the internal wall has been moved to the other side of the pipe to prevent water from flowing through the outlets.

Figure 3 is a section view showing one preferred manner of manufacturing the pipe.

Figure 4 illustrates the pipe of Figure 3 where the internal dividing wall has moved.

Figure 5 shows a diverter valve according to an embodiment of the invention.

Figure 6 illustrates a section view of a diverter valve fitted to a pipe.

Figure 7 shows a diverter valve of slightly different design fitted to WO 99/51905 PCT/AU98/00233 4 a pipe.

Figure 8 shows a sealing arrangement in the diverter valve.

Figure 9 illustrates another diverter valve.

Figure 10 shows how the divider wall is attached to the arm of the diverter valve of Figure 9.

BEST MODE Referring to the drawings and initially to Figures 1 and 2, there is shown a pipe 10. Pipe 10 in the embodiment is formed from flexible plastic and has an internal diameter of about 30cm and a wall thickness of about 1 2mm.

Pipe 10 can be flattened and rolled up when not in use, and can be several kilometers long.

Openings 11 are spaced along the outer wall of pipe 10 and valves or other connections can be attached to opening 11.

Pipe 10 has an internal flexible longitudinal dividing wall 12. Wall 12 extends entirely along the inside of pipe 10 and can be made from the same flexible material as the pipe.

Internal wall 12 is flexible and can move between a first flow position illustrated in Figure 1 where wall 12 is adjacent one side of pipe 10, and a second position illustrated in Figure 2 where wall 12 has moved to the opposite side of pipe To allow this movement, wall 12 can be formed from stretchable material, although it is at this stage desired that the wall is formed from flexible substantially inextensible material, so the width of wall 12 will need to be longer than the intemrnal diameter of pipe 10 to allow the wall to move between its positions.

One advantage of this movement of internal wall 12 is that the useable diameter of the pipe is virtually unchanged, and this is illustrated in Figures 1 and 2.

For instance, in Figure 1, wall 12 has moved entirely to its one side and water can flow virtually through the entire internal diameter of pipe 10 and out openings 11.

WO 99/51905 PCT/AU98/00233 However, when wall 12 is moved to its position illustrated in Figure 2, water can still flow virtually along the entire internal volume of pipe 10, but wall 12 in the position of Figure 2, prevents water from flowing through openings 11.

The internal dividing wall 12 is sealed adjacent its longitudinal edges such that water cannot pass from one side of wall 12 to the other side of wall 12 while flowing along the pipe.

Figures 3 and 4 illustrate one preferred way in which the divided pipe can be made. Referring to Figure 3, a flexible tube 13 is formed and an outer longitudinal sheet 14 is attached to tube 13 at longitudinal edges 15. This, in essence, makes the top part 16 of tube 13 the internal flexible wall, and this is illustrated in Figure 2 which shows wall 16 having moved to one of its positions.

Figure 5 illustrates a diverter valve 17 which is attached to one end of pipe 10 to divert water either along channel A or channel B (see Figures 1 4).

Simply stated, diverter valve 17 pushes the flexible wall 12 between the positions illustrated in Figures 1 and 2 by attaching wall 12 to a valve member 18 (valve member 18 being internal and better illustrated in Figures 6 and 7).

Referring to Figures 6 and 7, there are shown two slightly different diverter valves which function in the same way. Referring initially to Figure 6, diverter valve 17 has an outer rigid tubular wall 19, and one end of the flexible pipe 10 is attached to wall 19 either by a clamp, by welding, or any other suitable means. Once attached, the internal wall 12 is looped around an edge of valve member 18 and fastened by any suitable method at Valve member 18 can be manually moved via an external handle 21 (see Figure 5) between an upper position illustrated in Figures 6 and 7, and a lower position where valve member 18 has been rotated in the direction of arrow 22 to a lower position. As valve member 18 moves, it will move wall 12 between an upper position illustrated in Figures 6 and 7 and a lower position (not shown).

In the upper position illustrated in Figures 6 and 7, water flows in the direction of arrow 23 along one side of wall 12, while when in the lower position, water flows again in the direction of arrow 23 along the other side of wall 12.

In the embodiment, diverter valve 17 has a flow portion 24 which WO 99/51905 PCT/AU98/00233 6 functions to re-direct water flow away from the edge portion 25 of valve member 18 to prevent water from passing along the wrong side of wall 12.

Figure 8 shows a sealing arrangement. Referring to Figure 8, there is illustrated wall 19 of diverter valve 17, a portion of valve member 18, an axle 26, ring seals 27, 28, a split pin 29, and collar The flexible pipe allows internal wall to be simply moved from side to side to seal all openings 11 thereby doing away with the requirement to separately shut off each opening. The diverter valve 17 is a simple yet reliable mechanism to move internal wall 12 between its positions.

Figures 9 and 10 show a valve member 18 formed from two parts 18A, 18B (see Figure 10), between which can be sandwiched dividing wall 12.

Spring clips 30 are used to hold parts 18A, 18B together.

It should be appreciated that various other changes and modifications may be made to the embodiment described without departing from the spirit and scope of the invention.

Claims (8)

1. A pipe to convey a fluid, the pipe having an inlet and a plurality of fluid outlets along its length, the pipe having an intemrnal flexible longitudinal dividing wall which divides the pipe into a first part and a second part, and which can move between a first flow position where fluid can pass along one. said part of the pipe and through the said fluid outlets which are all in communication only with the said one part, and a second position where fluid is unable to pass through the at least said one part and therefore unable to pass through the plurality of outlets. lo

2. The pipe of claim 1, wherein the pipe comprises a flexible outer wall and the intemrnal flexible longitudinal dividing wall.

3. The pipe of claim 2, having a multiplicity of said fluid outlets spaced along the pipe.

4. The pipe of claim 3, comprising a first flexible tubular member and a second flexible elongate rectangular sheet member where the longitudinal edges of the sheet member are attached to the first flexible tubular member at spaced apart positions and in a fluid tight manner such that the sheet member and part of the tubular member define the outer wall of the pipe and another part of the tubular member is the internal dividing wall.

5. The pipe of claim 1, wherein the dividing wall seals against the said at least one fluid outlet when in the second position.

6. The pipe of claim 1, wherein a diverter valve is attached to the inlet side of the pipe, the diverter valve being able to move the dividing wall between its said first flow position and said second position.

7. The pipe of claim 6, wherein the diverter valve has a valve member which is attachable to an end of the dividing wall and which can move the end of the dividing wall between opposed sides of the pipe, thereby allowing fluid to selectively pass along each side of the dividing wall between the said first flow position and the said second position.

8. A diverter valve for a pipe to convey a fluid, the pipe having an inlet and at least one fluid outlet along its length, the pipe having an internal Ay AMENDa:. SHEE) 1PEAIAU PCT/AU98/00233 S/ Received 19 November 1999 8 flexible longitudinal dividing wall which can move between a first flow position where fluid can pass along the pipe and through the said fluid outlet and a second position where fluid is unable to pass through the at least one outlet, and a diverter valve which is attached to the inlet side of the pipe, the diverter valve being able to move the dividing wall between its said first flow position and said second position. AMENDED SHEE'