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The present invention provides a flow-control support for a distributor plate in a composite pressure vessel. The distributor plate includes a thermoplastic polymeric disk having a top side, a bottom side, a perimeter edge and a central opening and a plurality of fluid flow passages through the disk

The present invention provides a flow-control support for a distributor plate in a composite pressure vessel. The distributor plate includes a thermoplastic polymeric disk having a top side, a bottom side, a perimeter edge and a central opening and a plurality of fluid flow passages through the disk. The flow-control support is disposed between the bottom side of the disk and an inner side of an end of a thermoplastic liner assembly. The flow-control support includes a spirally fluted upper surface that is adapted to direct fluid flowing from a supply pipe disposed in the central opening of a distributor plate that is supported by the flow control support such that the fluid swirls in a space between the bottom side of the distributor plate and an inner side of an end portion of a water treatment vessel. The swirling water insures that fluid is distributed to substantially all of the fluid flow passages through the disk during backwashing operations.

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1. A flow control support for a distributor plate disposed within a composite pressure vessel, the flow control support comprising: a disk having a spirally fluted upper surface;a plurality of support members extending from the disk for supporting a bottom side of the distributor plate above the spi

1. A flow control support for a distributor plate disposed within a composite pressure vessel, the flow control support comprising: a disk having a spirally fluted upper surface;a plurality of support members extending from the disk for supporting a bottom side of the distributor plate above the spirally fluted upper surface of the disk; anda plurality of feet provided on a side opposite the spirally fluted upper surface of the disk for contacting an inner side of an end portion of the composite pressure vessel;wherein an axial opening is provided through the disk. 2. The flow control support according to claim 1 wherein the spirally fluted upper surface of the flow control support is adapted to direct fluid flowing from a supply pipe disposed in a central opening of the distributor plate above the axial opening such that at least a portion of the fluid flowing from the supply pipe swirls in a space between the bottom side of the distributor plate and the inner side of the end portion of the composite pressure vessel. 3. The flow control support according to claim 2 wherein the spirally fluted upper surface of the flow control support is adapted to swirl the fluid flowing from the supply pipe in a counter clockwise direction relative to the upper surface of the flow control support and about the central opening of the distributor plate. 4. The flow control support according to claim 3 wherein a first portion of the fluid flowing from the supply pipe is adapted to pass through the axial opening at the same time as a second portion of fluid flowing from the supply pipe contacts the spirally fluted upper surface of the flow control support. 5. The flow control support according to claim 4 wherein the first portion of fluid that passes through the axial opening is adapted to exit from beneath the flow control support through gaps between a bottom side of the flow control support and the inner side of the end portion of the composite pressure vessel. 6. The flow control support according to claim 4 wherein the second portion of fluid that contacts the spirally fluted upper surface of the flow control support is adapted to exit from the space through gaps between the bottom side of the distributor plate and the spirally fluted upper surface of the flow control support. 7. The flow control support according to claim 1 wherein the plurality of support members extend from peaks in the spirally fluted upper surface of the disk. 8. The flow control support according to claim 1 wherein the plurality of support members each include a groove for receiving a fin extending from the bottom side of the distributor plate. 9. A water treatment vessel comprising: a hollow thermoplastic liner having an inner side and a first end portion;a reinforcing layer covering the hollow thermoplastic liner, the reinforcing layer comprising a plurality of glass filaments wrapped helically and circumferentially around the hollow thermoplastic liner; anda first distributor plate comprising a first plate having a top side, a bottom side, a central opening, a perimeter edge and a plurality of fluid flow passages through the first plate, the perimeter edge being welded to the inner side of the thermoplastic liner proximal to the first end portion;a flow control support for the first distributor plate, the flow control support comprising:a disk having a spirally fluted upper surface;a plurality of support members extending from the disk for supporting the bottom side of the first distributor plate above the spirally fluted upper surface of the disk; anda plurality of feet provided on a side opposite the spirally fluted upper surface of the disk for contacting the inner side of the first end portion of the hollow thermoplastic liner anda supply pipe disposed in the central opening of the distributor plate above the disk. 10. The water treatment vessel according to claim 9 wherein an axial opening is provided through the disk. 11. The water treatment vessel according to claim 10 wherein the spirally fluted upper surface of the flow control support is adapted to swirl a backwashing fluid flowing out of the supply pipe in a counter clockwise direction relative to the upper surface of the flow control support and about the central opening of the distributor plate in a space between the bottom side of the distributor plate and the inner side of the first end portion of the hollow thermoplastic liner. 12. The water treatment vessel according to claim 11 wherein a first portion of the backwashing fluid flowing from the supply pipe is adapted to pass through the axial opening at the same time as a second portion of backwashing fluid flowing from the supply pipe contacts the spirally fluted upper surface of the flow control support. 13. The water treatment vessel according to claim 12 wherein the first portion of the backwashing fluid that passes through the axial opening is adapted to exit from beneath the flow control support through gaps between a bottom side of the flow control support and the inner side of the first end portion of the hollow thermoplastic liner. 14. The water treatment vessel according to claim 12 wherein at least some of the second portion of backwashing fluid that contacts the spirally fluted upper surface of the flow control support is adapted to exit from the space through gaps between the bottom side of the distributor plate and the spirally fluted upper surface of the flow control support. 15. The water treatment vessel according to claim 9 wherein the first distributor plate is adapted to support a first water treatment media. 16. The water treatment vessel according to claim 15 wherein the plurality of fluid flow passages through the first distributor plate are adapted to swirl a backwashing fluid in a counter-clockwise direction relative to the top side of the first distributor plate and about the central opening in the first distributor plate. 17. The water treatment vessel according to claim 15 further comprising a second distributor plate comprising a second plate having a top side, a bottom side, a central opening, a perimeter edge and a plurality of fluid flow passages through the second plate, the perimeter edge being welded to the inner side of the thermoplastic liner above the first distributor plate. 18. The water treatment vessel according to claim 17 wherein the second distributor plate is adapted to support a second water treatment media that is different than the first water treatment media and wherein the plurality of fluid flow passages through the second distributor plate are adapted to swirl the backwashing fluid in a counter-clockwise direction relative to the top side of the second distributor plate and about the central opening in the second distributor plate. 19. The water treatment vessel according to claim 9 wherein the plurality of fluid flow passages through the first plate comprise slits provided in a radial pattern about the central opening. 20. The water treatment vessel according to claim 9 wherein the flow control support is formed of polypropylene.