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A capsule adapter (1) is described, for use in a beverage producing machine. The capsule adapter comprises: a capsule receptacle (3) for housing a capsule (C) and having an apertured bottom wall (3B); a first piercer (19) arranged in the capsule receptacle (3); a cover (5) for closing the capsule re

A capsule adapter (1) is described, for use in a beverage producing machine. The capsule adapter comprises: a capsule receptacle (3) for housing a capsule (C) and having an apertured bottom wall (3B); a first piercer (19) arranged in the capsule receptacle (3); a cover (5) for closing the capsule receptacle (3), the cover having at least one water-inlet port (37); a second piercer (27) arranged on the cover (5). The capsule adapter is configured for being introduced in a brewing chamber of a beverage producing machine, with a capsule housed therein.

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1. A capsule adapter for use in a beverage producing machine, said capsule adapter comprising: a capsule receptacle for housing a capsule and having an apertured bottom wall;a first piercer arranged in said capsule receptacle;a cover for closing said capsule receptacle, said cover having at least on

1. A capsule adapter for use in a beverage producing machine, said capsule adapter comprising: a capsule receptacle for housing a capsule and having an apertured bottom wall;a first piercer arranged in said capsule receptacle;a cover for closing said capsule receptacle, said cover having at least one water-inlet port;said capsule adapter being configured for being introduced in a brewing chamber with a capsule housed therein;wherein a second piercer is arranged on said cover and is movably connected thereto, andwherein said capsule receptacle comprises an annular shoulder surrounding a capsule seat; and an annular sealing gasket is arranged for co-acting with said annular shoulder when said capsule adapter is in a closed condition. 2. Capsule adapter according to claim 1, comprising a reversible locking arrangement for reversibly locking said cover to said capsule receptacle, said cover comprising two oppositely arranged pins radially projecting from said cover, wherein said pins are adapted for engagement in respective channel guides provided along an upper rim of said capsule receptacle, and wherein said pins slidingly engage along said respective channel guides thereby reversibly engaging said cover to the capsule receptacle. 3. Capsule adapter according to claim 1, wherein said cover comprises a sealing gasket co-acting with said capsule receptacle. 4. Capsule adapter according to claim 1, wherein said second piercer is resiliently biased in a closed rest position by a resilient member in said cover, wherein in said closed rest position said second piercer is retracted in a hollow space inside of a hollow space inside a collar. 5. Capsule adapter according to claim 4, wherein the resilient member is a helical compression spring retained between a first surface said second piercer and an annular abutment radially inwardly projecting from said collar. 6. Capsule adapter according to claim 5, wherein the length of the piercing projections and the height of the collar are selected such that in the closed resting position, the perforating projections will not perforate the top wall of the capsule retained in the capsule receptacle. 7. Capsule adapter according to claim 1, wherein said second piercer is rotatingly connected to said cover, so that said second piercer is prevented from rotating with respect to the capsule receptacle while the cover and said capsule receptacle rotate one with respect to the other to engage the cover to the capsule receptacle. 8. Capsule adapter according to claim 1, wherein said first piercer comprises: a first piercing plate, provided with a first surface facing the bottom wall of said capsule receptacle and a second surface facing the interior of said capsule receptacle; at least one central piercing projection extending from said second surface towards the interior of the capsule receptacle; and at least one through aperture fluidly connecting said first surface and said second surface of said first piercing plate. 9. Capsule adapter according to claim 1, wherein said water inlet port is centrally arranged in said cover and wherein said second piercer comprises: a second piercing plate, provided with a first surface facing said cover and a second surface facing the interior of said capsule receptacle, when said cover is connected to said capsule receptacle; a plurality of piercing projections extending from said second surface. 10. Capsule adapter according to claim 9, wherein said second piercer further comprises a plurality of through apertures fluidly connecting said first surface and said second surface of said second piercing plate. 11. Capsule adapter according to claim 1, comprising a recognition element. 12. A system for producing beverages by means of single serve capsules containing at least one ingredient, said system comprising: a beverage-producing machine with a brewing chamber:and a capsule adapter said capsule adapter being designed to be housed in said brewing chamber;wherein said capsule adapter comprises: a capsule receptacle for housing a capsule and having an apertured bottom wall;a first piercer arranged in said capsule receptacle;a cover for closing said capsule receptacle, said cover having at least one water-inlet port;wherein a second piercer arranged on said cover and is movably connected thereto, andwherein said capsule receptacle comprises an annular shoulder surrounding a capsule seat; and an annular sealing gasket is arranged for co-acting with said annular shoulder when said capsule adapter is in a closed condition. 13. System according to claim 12, wherein said machine comprises a sensor for detecting the presence of said capsule adaptor in said brewing chamber, and wherein said machine comprises a water pump and a setting device, for setting at least one water-flow parameter according to whether said sensor detects the presence of said capsule adapter in the brewing chamber. 14. System according to claim 12, wherein said sensor is designed and arranged to detect a recognition element on said capsule adapter, when said capsule adapter is introduced in said brewing chamber. 15. System according to claim 12, wherein said machine comprises a control unit connected to said sensor said control unit being arranged for modifying at least one water flow parameter based on a signal from said sensor. 16. System according to claim 12, wherein at least one capsule piercing member is arranged in said brewing chamber. 17. System according to claim 16, wherein said brewing chamber, said at least one capsule piercing member arranged in the brewing chamber and said capsule adapter are designed so that when said brewing chamber is closed with said capsule adapter therein, said at least one capsule piercing member arranged in the brewing chamber does not pierce the capsule adapter. 18. System according to claim 16, wherein said brewing chamber, said at least one capsule piercing member arranged in the brewing chamber and said capsule adapter are designed so that when said brewing chamber is closed with said capsule adapter therein, said at least one capsule piercing member arranged in the brewing chamber is positioned in or in front of a port provided in said capsule adapter, preventing said piercing member from damaging the capsule adapter. 19. System according to claim 16, wherein said at least one capsule piercing member arranged in the brewing chamber and said capsule adapter are designed such that said at least one capsule piercing member arranged in the brewing chamber is positioned to deliver water in said water inlet port of said cover of the capsule adapter. 20. System according to claim 16, wherein a second capsule piercing member is arranged in said brewing chamber, and wherein said brewing chamber, said second capsule piercing member arranged in the brewing chamber and said capsule adapter are designed so that when said brewing chamber is closed with said capsule adapter therein, said second capsule piercing member arranged in the brewing chamber does not pierce the capsule adapter. 21. System according to claim 16, wherein a second capsule piercing member is arranged in said brewing chamber, and wherein said brewing chamber, said second capsule piercing member arranged in the brewing chamber and said capsule adapter are designed so that when said brewing chamber is closed with said capsule adapter therein, said second capsule piercing member arranged in the brewing chamber is positioned in or in front of a port provided in the bottom wall of said capsule receptacle, preventing said second piercing member from damaging the capsule adapter. 22. System according to claim 21, wherein the second capsule piercing member arranged in the brewing chamber is positioned so that a beverage dispensed from said capsule adapter flows there through.