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1. A compact security valve to be used in a dispenser equipped with an opening probe, the compact security valve comprising a tamper-proof security mechanism and an encrypted opening code etched on an outer surface of the valve, wherein the security mechanism comprises a series of cylinders having a single position in which the valve is capable of being removed, and three key disks located concentrically, an inner disk, a middle disk and an outer disk, which are capable of rotating independently and freely, wherein the inner disk has a step on an outer surface of the inner disk that transmits a rotation of the inner disk to the middle disk by pushing a step of the middle disk located on a top surface of the middle disk, while the middle disk transmits a rotation of the middle disk by means of another step located on an outer surface of the middle disk to the outer disk by pushing a step located on a top surface of the outer disk, and wherein each key disk has a key groove that is carved at a given and variable angle with respect to the rotation step of each key disk, wherein the alignment of the key grooves allows the release of the valve for removal and wherein said opening code is formed by three encrypted numbers representing the angle at which the key groove has been etched on each of the three key disks.
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