An insert is provided for insertion through an opening in the surface of a conduit, the insert comprising an insert body having first and second open ends defining an axis of flow therebetween. The insert further comprises a valve flap connected to the insert body. The valve flap is movable between
An insert is provided for insertion through an opening in the surface of a conduit, the insert comprising an insert body having first and second open ends defining an axis of flow therebetween. The insert further comprises a valve flap connected to the insert body. The valve flap is movable between a closed position in which it creates a closure, thereby preventing flow along said axis, and an open position in which the valve flap allows flow along the axis. The valve flap is arranged so that, when in the open position, it is substantially U-shaped in side cross-section and is oriented with respect to the insert body so that said U-shape arches over the axis of flow.
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1. An insert for providing a valve in a conduit, the insert being arranged for insertion through a slot created in a surface of said conduit, said slot not extending across a full section of the conduit, the insert comprising: an insert body having first and second open ends, defining an axis of flo
1. An insert for providing a valve in a conduit, the insert being arranged for insertion through a slot created in a surface of said conduit, said slot not extending across a full section of the conduit, the insert comprising: an insert body having first and second open ends, defining an axis of flow therebetween;a valve flap connected to said insert body;the valve flap being movable between a closed position in which the valve flap creates a closure, thereby preventing flow along said axis, and an open position in which the valve flap allows flow along said axis;the valve flap being arranged so that, when in the open position, it is substantially U-shaped in side cross-section and is oriented with respect to the insert body so that said U-shape arches over the axis of flow. 2. The insert as claimed in claim 1 wherein the valve flap is hingedly attached to said insert body. 3. The insert as claimed in claim 1 wherein movement of the valve flap from said closed position to said open position is permitted in a single rotational direction only. 4. The insert as claimed in claim 1 wherein, in the closed position, the cross section of the valve flap when viewed along the axis of flow matches either a cross section of the insert body or a cross section of the conduit to form said closure. 5. The insert as claimed in claim 1 wherein at least a portion of an inner surface of the insert body is curved and wherein a curvature of the U-shape of the valve flap in an open position matches a curvature of said portion of the inner surface of the insert body. 6. The insert as claimed in claim 1, further comprising a biasing means to bias the valve flap towards the closed position. 7. The insert as claimed in claim 1 further comprising a seal arranged to cooperate with the valve flap to form said closure. 8. The insert as claimed in claim 1 further comprising a substance for testing a fluid flow. 9. A system including the insert as claimed in claim 1 and further comprising a sleeve for insertion into the conduit. 10. A system as claimed in claim 9 further comprising sealing means to prevent leakage from the conduit after insertion of the insert therein. 11. The insert for providing a valve in a conduit, the insert being arranged for insertion through a slot in a surface of said conduit, said slot not extending across a full section of the conduit, the insert comprising: an insert body having first and second open ends, defining an axis of flow therebetween; anda valve flap connected to said insert body, wherein the valve flap is at least partially deformable from a first configuration to a second, different configuration;the valve flap being movable between a closed position in which the valve flap creates a closure, thereby preventing flow along said axis, and an open position in which the valve flap allows flow along said axis; andthe valve flap being arranged so that, when in the open position, it is substantially U-shaped in side cross-section and is oriented with respect to the insert body so that said U-shape arches over the axis of flow. 12. The insert as claimed in claim 11 wherein in the first configuration the valve flap is substantially planar and in the second configuration the valve flap is substantially U-shaped in side cross-section. 13. The insert as claimed in claim 11 wherein the valve flap comprises a relatively flexible valve body and one or more relatively rigid portions attached to the relatively flexible valve body. 14. The insert as claimed in claim 13 wherein the one or more relatively rigid portions comprise wire. 15. The insert as claimed in claim 14 wherein the wire comprises spring wire and wherein said spring wire connects to a spring, said spring forming part of a control means for controlling movement of said valve flap. 16. The insert as claimed in claim 15 wherein the control means further comprises a plate having inner and outer plate portions connected to either end of the spring, wherein said inner plate portions are arranged to rotate upon rotation of the valve flap and wherein said rotation of the inner plate portions causes lateral outward movement of the outer plate portions. 17. The insert for providing a valve in a conduit, the insert being arranged for insertion through a slot created in a surface of said conduit, said slot not extending across a full section of the conduit, the insert comprising: an insert body having first and second open ends, defining an axis of flow therebetween;a valve flap connected to said insert body;the valve flap being movable between a closed position in which the valve flap creates a closure, thereby preventing flow along said axis, and an open position in which the valve flap allows flow along said axis;the valve flap being arranged so that, when in the open position, it is substantially U-shaped in side cross-section and is oriented with respect to the insert body so that said U-shape arches over the axis of flow; andwherein at least a portion of said insert is impregnated with a substance to be dissolved in a fluid flow or comprises a material that will dissolve or react with a fluid flow. 18. A system comprising: an insert for providing a valve in a conduit, the insert being arranged for insertion through a slot created in a surface of said conduit, said slot not extending across a full section of the conduit, the insert comprising: an insert body having first and second open ends, defining an axis of flow therebetween;a valve flap connected to said insert body;the valve flap being movable between a closed position in which the valve flap creates a closure, thereby preventing flow along said axis, and an open position in which the valve flap allows flow along said axis; andthe valve flap being arranged so that, when in the open position, it is substantially U-shaped in side cross-section and is oriented with respect to the insert body so that said U-shape arches over the axis of flow;wherein the system further comprises: a sleeve for insertion into the conduit; andsealing means to prevent leakage from the conduit after insertion of the insert therein, wherein the sealing means comprises a jointing strap for fitting to an outer surface of the conduit. 19. A system as claimed in claim 18 wherein said jointing strap includes a template for creating a slot in the conduit for insertion of an insert. 20. A method of providing a valve in a conduit, said method comprising: creating a slot in a surface of the conduit, said slot not extending across a full cross section of the conduit, and fitting an insert via said slot, said insert comprising:an insert body having first and second open ends, defining an axis of flow therebetween, and a valve flap connected to said insert body;the valve flap being rotatable between a closed position in which the valve flap creates a closure, thereby preventing flow along said axis, and an open position in which the valve flap allows flow along said axis;the valve flap being arranged so that, when in the open position, it is substantially U-shaped in side cross-section and is oriented with respect to the insert body so that said U-shape arches over the axis of flow. 21. The method as claimed in claim 20 wherein movement of the valve flap from said closed position to said open position is permitted in a single rotational direction only. 22. The method as claimed in claim 20 wherein at least a portion of an inner surface of the conduit is curved and wherein a curvature of the U-shape of the valve flap in the open position matches a curvature of said portion of the conduit. 23. The method as claimed in claim 20 further comprising inserting a sleeve into the conduit, via the slot, before inserting the insert therein. 24. The method as claimed in claim 20 further comprising adding a sealing means to prevent leakage from the conduit after insertion of the insert therein. 25. The method as claimed in claim 20 wherein the slot is created in the conduit in a direction substantially perpendicular to the axis of flow in the conduit. 26. The method as claimed in claim 20 wherein the conduit is comprised in a domestic plumbing system. 27. The method of providing a valve in a conduit, said method comprising: creating a slot in a surface of the conduit, said slot not extending across a full cross section of the conduit;inserting two sleeves into the conduit, via the slot, and locating the sleeves either side of a space into which the insert is to be inserted; andfitting an insert via said slot;said insert comprising: an insert body having first and second open ends, defining an axis of flow therebetween, and a valve flap connected to said insert body;the valve flap being rotatable between a closed position in which the valve flap creates a closure, thereby preventing flow along said axis, and an open position in which the valve flap allows flow along said axis; andthe valve flap being arranged so that, when in the open position, it is substantially U-shaped in side cross-section and is oriented with respect to the insert body so that said U-shape arches over the axis of flow.
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