Patent ID: 7784396

Claim:
A brewing head for a beverage brewing system comprising: A) pod holder means for receiving a beverage pod, the pod holder means including a sealing surface, B) support means for supporting the pod holder means with a beverage pod in a first fixed position, C) an open bottom boiler unit fixed in to the support means at a second position for receiving water under pressure, D) a piston valve sub-assembly adapted for motion relative to the boiler unit and the pod holder means, and E) an expandable seal having one end attached to the boiler unit adjacent the open bottom, the other end being attached to the piston valve sub-assembly and a intermediate portion thereof overlying the pod holder means sealing surface whereby as the pressure of the water in the boiler unit and in contact with the interior of the expandable seal increases an exterior portion of the expandable seal forms a seal with the pod holder means sealing surface.