Title of Invention

"A FLUID FLOW REVERSAL DEVICE FOR IMPROVEMENTS IN FLUID CIRCULATING SYSTEM"

Abstract

The present invention provides a fluid flow reversal device (100) comprises a first conduit )1), the first conduit (1) having a cross-shaped configuration provided by a first arm (30) and a second arm (32, 34) thereof, a second conduit (6), which second conduit (6) is concentrically arranged about the first arm (30) of the first conduit (1), the second arm (32, 34) of the first conduit (1) being arranged to extend through opposing sides of the second conduit (6), and a valve (2, 3) designed to control the direction of fluid flow through the second arm (32) of the first conduit (1), in use.

Full Text

The present invention relates to the improvements in fluid circulating systems, in particular, although not exclusively to a fluid valve for a textile processing machine. Yam for textile manufacture is commonly wound on a perforated tubular or fluted bobbin, to form a permeable package through which dye liquor can be circulated during a dyeing process. During the dyeing process, the permeable packages are mounted on a perforated spindle in a package carrier, which package carrier is submerged in dye liquor during the dyeing process. In practice, eight or rune packages are commonly stacked on each of a plurality of spindles. A sealing disc in then placed on top of each column of packages and locked onto the spindle to render the top of the column water tight. The package dyeing process involves passing dye or other treatment liquor through the permeable packages, hi order to achieve even colouring throughout the 15 thickness of the yarn package, it is common to pass the dye liquor through the packages hi two opposing directions; namely, inside-out flow and outside-in flow. Inside-out flow means the liquor flows from the 'perforated core of the package, through the yarn, to exterior of the package. Whereas, outside-in flow means the liquor flows from the exterior of the package, through the yarn to the perforated core of the package. Package dyeing machines generally comprise a pump and a reverse valve hi order to facilitate the reversible flow of treatment liquor. The pump often comprises a centrifugal pump, because such a pump provides the high pressure and high flow rate flow required to overcome the high resistance to the flow of the dye liquor exhibited by the yarn packages. However, a centrifugal pump can generally only operate hi one direction. Therefore, a valve is used to facilitate reversal of the flow direction. Typical flow reversal valves require an excessive amount of external piping hi order to facilitate the reversal of fluid flow. Such valve designs are disadvantageous because they require a larger amount of treatment liquor to fill the extra piping. Also, die material costs of making the valve are high. It is an object of preferred embodiments of the present invention to provide an improved pump. A fluid reversal device comprising a first conduit, the first conduit having a first arm and a second arm, the first arm intersecting with the second arm, such that the interior of the first arm is fluid flow communicable with the interior of the second arm, the first arm and the second arm both having an opening at each end, a second conduit concentrically about the full circumference of the first arm of the first conduit, a first end of the second conduit being connectable to the impeller and a second end of the second conduit being closed, a first end of the first arm of the first conduit stopping short of the closed second end of the second conduit, the second arm of the first conduit extending through opposing sides of the first and second arms of the first conduit, designed to control the direction of fluid flow through the second arm of the first conduit, in use. The first end of the first conduit may extend through the second opening in the housing. Alternately, the first end of the first conduit may be contained within the housing. The first end of the second conduit may extend through the second opening hi the housing. Alternatively, the first end of the second conduit may be contained within the housing. The present invention provides a fluid flow reversal device comprising a first conduit, the first conduit having a first arm and a second arm, the first arm intersecting with second arm such, that that the interior of the first arm is fluid flow communicable with the ulterior of the second arm, the first arm and the second arm both having an opening at each end, a second conduit, arranged concentrically about the full circumference of the first arm of the first conduit, a first end of the second conduit being connectable to an impeller and a second end of the second conduit being closed, a first end of the first arm of the first conduit being connectable to the impeller and a second end of the first arm of the first conduit stopping short of the closed second end of the second conduit, the second arm of the first conduit being arranged to extent through opposite sites of the second conduit, and a valve, located at the point of intersection of the first and second arms of the first conduit, Suitably, the first arm of the first conduit comprises a first pipe having a first end and a second end. Suitably, the second arm of the first conduit is provided by first and second pipe sections extending from opposing sides of the first arm. The first and second pipe sections are suitably aligned with one another. Suitably, the first and second pipe sections each extend substantially perpendicular of the first arm. The first pipe preferably has first and second openings in the wall thereof, the first opening corresponding with the location of the first pipe section and the second opening corresponding with the location of the second pipe section. Suitably, the first and second pipe portions are located closer to the second end .of the first pipe than the first end of the first pipe. The second conduit suitably comprises a second pipe. The second pipe is preferably a substantially straight pipe, having a first end and a second end. The diameter of the second pipe is suitably greater than the diameter of the first pipe. An annular passage is provided between the exterior of the first conduit and the interior of the second conduit. Preferably, the second conduit extends substantially parallel to the first arm of the first conduit. Suitably, the centre longitudinal axis of the second conduit coincides with the centre longitudinal axis of the first arm of the :first conduit. The second conduit suitably comprises a first opening and a second opening in a side wall thereof, through which first and second openings the second arm of the first conduit extends. Suitably, the first pipe section of the second arm of the first conduit extends through the first opening in the second conduit. Suitably, the second pipe section of the second arm of the first conduit extends through the second opening in the second conduit. The first pipe, the second pipe and the first and second pipe sections may have any suitable cross-sectional shape, for example, square, rectangular polygonal or, preferably, substantially circular. The first conduit may have any suitable conformation, for example. T-shaped. The first conduit suitably has a substantially cross shaped confirmation. In use of a device according to the present invention, each and of the second arm of the first conduit is suitably connectable to a processing machine, for example, a textile processing machine. The valve may comprise a closure member rotatably mounted on an axle. Suitably, the axle provides an axis of rotation about which the closure member rotates. The axle is suitably located at substantially the centre point of intersection of the first arm and the second arm of the first conduit. The axle may be connected to any suitable actuation means, for example, a motor, which motor controls the movement of the rotatable closure member. The closure member may comprise a separation plate. The separation plate may have any suitable shape, but preferably has a substantially square or rectangular profile. Preferably, the separation plate has a shape that corresponds with the interior profile of the first conduit in a manner such as to effect a substantially fluid tight fit with the interior of the first conduit hi either in the first position or in second position. The axis of rotation of the separation plate may extend across the width of the plate, such that rotation of the separation plate about the axis effects a change in the angle of inclination or the plate relative to the first conduit Preferably, the axis of rotation intersects the centre of the separation plate. The closure member is suitably rotatable between the first position and the second position. Preferably, there is a fluid tight fit between the closure member and the ulterior of the first conduit when the closure member is in the first position. Preferably, mere is a fluid tight fit between the closure member and the interior of the first conduit when the closure member is in the second position. The angle of rotation of the closure member between the first: position and the second position is greater than 0°, suitably greater than 25°, preferably greater than 45° and more preferably greater than 60°. The angle of rotation of the closure member between the first position and the second position is less than 180°, suitably less than 165°, preferably less than 135° and more preferably less than 120°. In a preferred embodiment of the present invention the angle of rotation of the closure member between the first: position and the second position is about 90°. A fluid flow reversal device according to the present invention suitably comprises a connector, which connects places the second arm of the first conduit in a fluid flow communication with a processing machine. The connector may be housing containing at least the second arm of the first conduit. The housing may be of any suitable shape, but is preferably cylindrical. The housing is suitably provided by a high-pressure vessel. The housing may comprise a first end connectable to a processing machine providing a base. The housing may comprise a second end. The second end is substantially opposite the first end. The second end of the housing is suitable closed The end of the second pipe section of the second arm of the first conduit suitably stops short of the closed second end of the housing. The processing machine is suitably a textile yarn processing machine such as a yarn dyeing machine. The first end of the housing suitably comprises one or more perforations therein suitable to place the interior of the housing in fluid flow communication with the exterior of the housing. The first end of the housing may further comprise a first opening arranged to place the interior of the second arm of the first conduit in fluid flow communication with the exterior of the housing. Suitably, a distal end of the first pipe section of the second arm of the first conduit extends to the first opening in the housing. The second end of the first conduit is suitably spaced apart from the wall of the housing. The second end of the second conduit is suitably connected to the wall of the housing. The wall of the housing inside the second conduit may be curved. The curved section of housing wall suitably has a toroid profile. A fluid flow reversal device according to the present invention is suitably connectable to an impeller. A suitable impeller is a centrifugal pump. The centrifugal pump may comprise any suitable centrifugal pump. The housing of a fluid flow reversal device according to the present invention may comprise a second opening suitable for placing the fluid flow reversal device in fluid flow communication with the impeller. The second opening in the housing may be located in a side wall thereof. In use of a fluid flow reversal device with an impeller, the first end of the first conduit is suitable in fluid flow communication with the impeller. In use of a fluid flow reversal device with an impeller, the first end of the second conduit is suitable in fluid flow communication with the impeller. In this case, the first end of the first arm of the first conduit is suitably connected, in use, to a fluid inlet of the centrifugal pump. The first end of the second conduit is suitably connected, in use, to the fluid outlet of the centrifugal pump. The first end of the first arm of the first conduit and/or the second conduit may be connected indirectly to the fluid outlet of the centrifugal pump. The device according to the present invention may further comprise a heat exchanger. The heat exchanger may be located hi the annular passage between the first arm of the first conduit and the second conduit. Alternatively, or in addition , the heat exchanger may be a separate element located between the first end of the first arm of the first conduit, the first end of the second conduit and the impeller. Suitably the heat exchanger is connected to the outlet of the centrifugal pump. The first end of the first conduit may extend through the second opening in the housing. Alternatively, the first end of the first conduit may be contained within the housing. The first end of the second conduit may extend through the second opening in the housing. Alternatively, the first end of the second conduit may be contained within the housing. Suitably, the impeller is located externally of the housing. However, in an alternative embodiment or the present invention, the impeller may be located within the housing. The impeller is suitably powered by a motor attached either directly or indirectly thereto. Preferably, the motor for the impeller is located externally of the housing. Preferably, the motor of the axle is located externally of the housing. The fluid flow reversal device according to the present invention may be a yam processing machine fluid flow reversal device. In use of fluid flow reversal device according to the present invention, with a yam processing machine, such as a yam dyeing machine, the fluid flow reversal device is connected to the fluid vessel of the yam processing machine, and to an impeller, provided, for example, by a centrifugal pump. Fluid is metered into the system and is circulated around by means of the impeller. The direction of flow of the fluid is controlled by the valve in the fluid flow reversal device. Suitably, the suction flow direction of the impeller is substantially parallel to the discharge flow direction thereof. When the valve is in the first position, the fluid is sucked through the first end of the first arm of the first conduit by means of the impeller. The fluid is discharged from the impeller to flow into heat exchange pipes in a heat exchanger and then into the annular passageway provided between the exterior of the first arm of the first conduit and the interior of the second conduit The fluid flows along the passage to a chamber provided between the second end of the first arm of the first conduit and the wall of the housing. In the chamber between the second end of the first conduit and the housing wall, the fluid turns and enters the second end of the first arm of the first conduit With the valve in the first position, the fluid is directed into the first pipe section of the second arm of the first conduit. The fluid flows up through the first pipe section and out of the housing into a package carrier of the yarn processing machine to which the fluid flow reversal device is connected. The fluid then flows through the perforated cores of the yarn packages housed hi the package carrier and out through the yam. The fluid then flows into a collection vessel surrounding the package carrier. Fluid exits the package carrier via perforations in the housing of the fluid flow reversal device and flows towards the base of the housing. The circulating fluid enters the second pipe of the second arm of the first conduit and flows into the first arm of the first conduit back towards the impeller for re-circulation. With the valve in the second position, fluid is again sucked from the first arm of the first conduit by means of the impeller and discharged from the impeller into heat exchange pipes in a heat exchanger and then into the annular passage provided between the first conduit and the second conduit. The fluid flows along the passage into the chamber between the second end of the first arm of the first conduit and the housing wall. In this chamber the fluid turns and enters the second end of the first arm of the first conduit. The valve then deflects the fluid into the second pipe section of the second arm of the first conduit and out into the ulterior of the housing. The fluid flows through the housing to exits therefrom through the perforations in the first end thereof. The fluid flows from the perforations into the fluid collection vessel of the yarn processing machine and into the packages through the yam towards the perforated core. On passing through the perforated core of the packages, the fluid flows into the package carrier and back into the first conduit via the first pipe section of the second arm thereof. The impeller sucks the fluid back along the first arm of the first conduit for re-circulation. A fluid flow reversal device in accordance with the present invention advantageously comprises a reduced amount of external piping between the centrifugal pump and the valve, which reduces cost of manufacture and the amount of treatment fluid required. Moreover, in embodiments of the present invention, the rotatable closure member of the valve may be the only moving part within the fluid flow reversal device thereby reducing the maintenance requirements of the device. Furthermore, a fluid flow reversal device in accordance with the present invention advantageously comprises a heat exchanger connected between the centrifugal pump and the annular passage to heat up or cool down the fluid, for example the dye liquor. The present of the heat exchanger can improve the liquor ratio. In embodiments of the present invention, only the axle for supporting the rotatable closure member of the valve pierces the housing. Therefore, less material is required for reinforcement of the high pressure vessel around the openings in the walls thereof, The annular flow discharge arrangement of the fluid flow reversal device creates reduced flow resistance therefore requiring less power to drive the fluid flow. The present invention will now be described, by way of example only, with reference to the following drawings, in which: Figure 1 is a schematic, cross-sectional side view of a fluid flow reversal device arranged for use; Figure 2a shows the apparatus of figure 1 in use with a package carrier of a yam treatment machine, with the valve located in the first position, and Figure 2b shows the apparatus of figure 1 in use with a package carrier of a yam treatment machine, with the valve located in the second position. Figures 1,2a and 2b show a fluid flow reversal device 100 comprising a cross pipe 1, a rotatable closure member 2, mounted on an axle 3, an outer pipe 6 and a housing 7. The cross pipe 1 comprises a first pipe 30, and first and second pipe sections 32, 34 extending substantially perpendicular from the first pipe 30. The first and second pipe sections 32,34 extend from opposite sides of the first pipe 30 and are axially aligned. A first opening 36 and its second opening 38 in the side wall of the first pipe 30 ensures that the first pipe section 32 and the second pipe section 34, respectively is in fluid flow communication with the first pipe 30. The cross pipe 1 has four ports 11, 12,16 and 17. Port 16 of the first pipe 30 extends into the interior of the outer pipe 6, such that the cross pipe 1 is in fluid flow communication with the outer pipe 6 via the port 16. Port 12 of the cross pipe 1 is connected to the fluid inlet of a centrifugal pump 5. The centrifugal pump 5 houses an impeller 4. The centrifugal pump 5 is driven by an external motor 10. The outer pipe 6 has an ulterior diameter mat is greater man the exterior diameter of the first pipe 30. The outer pipe 6 is arranged concentrically with the first pipe 30 of the cross pipe 1. A first end 46 of the outer pipe 6 is connected to one end of heat exchange pipes 51 in a heat exchanger 50. The other end of the heat exchanger pipes 51 is connected to the fluid outlet of the centrifugal pump 5. A second end 48 of the outer pipe 6 is welded to the housing 7. The wall of the housing 7 has a curved profile 23 in the region at which the outer pipe 6 is welded thereto. The distal ends of the first pipe section 32 and the second pipe section 34 each extend through opposing sides of the outer pipe 6. The housing 7 has a generally cylindrical shape. One end of the housing 7 is closed and provides a base 44. The other end of the housing 7 is provided with a plurality of perforations 18 to allow fluid flow between the exterior and the interior of the housing 7, when in use. The first pipe section 32 of the cross pipe 1 extends through the full height of the housing 7 to the pierce the perforated end of the housing 7, thus allowing for fluid flow between the interior of the first pipe section 32 and the exterior of the housing?. The axle 3 of the closure member 2 is controlled by a motor (not shown), which motor is located externally of the housing. The closure member 2 can rotate between first position (shown in Figure 1) and a second position (as illustrated in dashed lines in Figure 1). Figure 2a and 2b illustrates the fluid flow reversal device 100 in use connected to a dyeing vessel 19 of a yarn dyeing machine (not shown). The arrows indicate the direction of flow of the fluid. When the closure member 2 is in the first position, as illustrated in figure 2a, fluid flows from the inside to the outside of the yarn packages 22 in the dye vessel 19. The centrifugal pump 5 creates a suction force to draw fluid through the first pipe 30 of the cross-pipe 1 and through port 12. The fluid is discharged from the centrifugal pump 5 through the heat exchange pipes 51 in the heat exchanger 50 and then into the annular passage 14 provided between the first pipe 30 and the outer pipe 6. As can be seen from the figures 2a and 2b, the suction flow direction is substantially parallel to the discharge flow direction. The fluid enters the turning chamber 15 provided between the housing, wall and the port 16 of the first pipe 30. The curved shape 23 of the housing wall at this location smooths the flow of fluid from the annular passage 14 into the port 16. The fluid is deflected by the closure member 2 to flow upwards through port 17 of the cross pipe 1 and out of the housing 7 into the package carrier 20 of the yam dyeing machine. The fluid flows into the perforated core 21 of each package 22, our through die yarn wound on the core 22 and into the dyeing vessel 19. The fluid then passes through the perforations 18 in the housing 7 to flow towards the base 44 of the housing 7 and up into the cross pipe 1 via port 11, to return to port 12 thereof. When the closure member 2 in the second position, as illustrated in figure 2b, fluid flows from the outside to the inside of the yarn packages 22. The centrifugal pump 5 sucks fluid from the cross pipe 1 via port 12 and then discharges the fluid into the annular passage 14. The fluid then enters the turning chamber 15 and enters the cross pipe 1 via port 16. The closure member 2 deflects the fluid to exit the cross pipe 1 via port 11. The fluid thus passes from the cross pipe 1 into the ulterior of the housing 7. The fluid flows upwards through the housing to exit therefrom via perforations 18 into the dye vessel 19. The fluid then passes through the yam on the packages 22 into the perforated cores 21 thereof. The fluid passes therefrom into the package carrier 20 and back into the cross pipe 1 via port 17 to return to the centrifugal pump 5 via port 12. WE CLAIM: 1. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems which comprises of a first conduit, the conduit having a first arm and a second arm, the first arm intersecting with the second ami, such that the interior of the first arm is fluid flow communicable with the interior of the second arm, both arms having openings at each end, a second conduit concentrically about the full circumference of the first arm of the first conduit, a first end of the second conduit being connectable to an impeller and a second end of the second conduit being dosed, a first end of the first arm of the first conduit stopping short of the closed second end of the second conduit, the second arm of the first conduit extending through opposing side walls of the second conduit, a valve designed to control the direction of the fluid flow through the second arm of the first conduit as mentioned in Figure 1. 2. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in Claim 1, wherein the second arm of the first conduit comprises first and second pipe sections extending from opposite sides of the boundary wall of the first arm. 3. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in Claim 2, wherein the first arm of the first conduit has two openings in the wall, the first opening corresponding with the location of the first pipe section and the second opening corresponding with the location of the second pipe section. 4. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in any one of the preceding claims, wherein the diameter of the second conduit is greater than the diameter of the first arm of the first conduit. 5. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in Claim 4, wherein a passage is provided between the exterior of the first conduit and the interior of the second conduit. 6. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in Claim 1, wherein the second conduit comprise first and second openings in a wall thereof, through which first and second openings the second arm of the first conduit extends. 7. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in any one of the preceding Claims 1£, wherein a valve is movable between a first position and a second position, wherein in the first position the second end of the first arm of the first conduit is in fluid communication with the first pipe section of the second arm of the first conduit and in the second position the second end of the first arm of the first conduit is in fluid flow communication with the second pipe section of the second arm of the first conduit. 8. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems device as claimed in any one of the preceding Claims 1-7, wherein the valve comprises a closure member rotatabaly mounted on an axle which is a separation plate. 9. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in the preceding Claims 1-8, wherein rotation of the separation plate about the axle effects a change in the angle of inclination of the plate relative to the first conduit. 10. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in Claims 8-9, wherein the angle of inclination of the closure member between the first position and the second position is greater than 0°and less than 180°. 11. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in Claim 10, wherein the angle of inclination of the closure member between the first position and the second position is greater than 45°. 12. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in Claims 10 and 11 wherein the angle of inclination of the closure member between the first position and the second position is less than 135°. 13. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in Claim in 10, 11 or 12, wherein the angle of inclination of the closure member between the first position and the second position is 90°. 14. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in any one of the preceding Claims 1-13, wherein the first conduit has a cross shaped configuration and each end of the second arm of the first conduit is connectable to a processing machine. 15. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in Claim 14, wherein the processing machine is a textile processing machine. 16. A device as claimed in any one of the preceding Claims, which has a connector which connector places the second arm of the first conduit in fluid flow communication with a processing machine. 17. A device as claimed in Claim 16, wherein the connector is a housing containing the second arm of the first conduit. 18. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in any one of the preceding Claims 1-17, wherein the housing has a first end connectable to the processing machine and a second end which is closed, the end of the second pipe section of the second arm of the first conduit stopping short of the second end of the housing. 19. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in the preceding Claims 17-18 wherein the first end of the housing comprises one or more perforations suitable to place the interior of the housing in fluid flow communication with the exterior of the housing. 20. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in any one of Claims 17-19, wherein the first end of the housing comprises a first opening connected to place the exterior of the housing in fluid flow communication with the interior of the second arm of the first conduit. 21. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in any one of Claims 17-20, wherein the second end of the second conduit is connected to the housing wall, wherein the housing wall is curved inside the second conduit. 22. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in Claim 21, wherein the housing wall comprises a toroid curve inside the second conduit. 23. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in any one of Claims 17-22, wherein the housing comprises a second opening located in a side wall thereof, through which the first end of the first arm of the first conduit extends. 24. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in any of the preceding Claims 1-23, wherein the first end of the second conduit extends through the second opening in the housing. 25. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in Claims 17-24 wherein the first end of the first arm of the first conduit is contained within the housing. 26. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in Claims 17-25, wherein the first end of the second conduit is contained within the housing. 27. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in any one of the preceding Claims 1-26, wherein the first end of the first arm of the first conduit is connected to the fluid inlet with an impeller. 28. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in any one of the preceding Claims 1-27, wherein the first end of the second conduit is connected to the fluid outlet of an impeller. 29. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in to any one of the preceding Claims 1-29, which is a yarn processing machine fluid flow reversal device. 30. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in any one of the preceding claims, having an impeller. 31. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in Claim 30, wherein the impeller has a discharge and a suction flow direction that are parallel to each other. 32. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in any one of the preceding Claims 1-31, having a heat exchanger located in the passage, provided between the exterior of the first arm of the first conduit and the interior of the second conduit. 33. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in any of the preceding Claims 1- 32, wherein the heat exchanger extends through the passage from the impeller towards the intersection of the first and second arms of the first conduit. 34. A device as claimed in Claim 33, wherein the heat exchanger stops short of the point of intersection of the first and second arms of the first conduit. 35. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in any one of the preceding Claims 1-34 wherein the impeller is provided by a centrifugal pump. 36. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in any one of the preceding Claims 1-35, wherein used in a textile yam processing machine. 37. A Fluid Flow Reversal Device for Improvements in Fluid Circulating Systems as claimed in any one of the preceding Claims 1-38 substantially as described herein and with reference to the drawings thereof.

Documents:

1119-del-2002-abstract.pdf

1119-del-2002-claims.pdf

1119-del-2002-correspondence-others.pdf

1119-del-2002-correspondence-po.pdf

1119-del-2002-description (complete).pdf

1119-del-2002-drawings.pdf

1119-del-2002-form-1.pdf

1119-del-2002-form-13.pdf

1119-del-2002-form-19.pdf

1119-del-2002-form-2.pdf

1119-del-2002-form-3.pdf

1119-del-2002-form-4.pdf

1119-del-2002-form-5.pdf

1119-del-2002-gpa.pdf

1119-del-2002-petition-137.pdf