Pressure retention closure

A threadless pressure retention closure for a container, comprising:

• a pressure closure assembly including
• a pressure relief valve, and
• an inner shell having an inner shell base wall configured to retain the pressure relief valve, a pressure relief slot for exposing a portion of the pressure relief valve, and an outer skirt extending away from the inner shell base wall and including a circumferentially interrupted portion and a circumferentially continuous portion;
• and
• an outer release shell configured to be coupled to the pressure closure assembly, and including
• a first portion having a first portion base wall configured to rest on top of a corresponding portion of the inner shell base wall when assembled, and a pressure relief tab projecting therefrom corresponding to the pressure relief slot of the inner shell, the first portion further having an outer skirt extending away from the first portion base wall and configured to wrap around the circumferentially interrupted portion of the outer skirt of the inner shell when assembled, and
• a second portion having a second base wall configured to overlap a second corresponding portion of the inner shell base wall when assembled, and an outer skirt extending away from the second portion base wall and being diametrically larger than the outer skirt of the first portion.

A threadless pressure retention closure for a container, comprising:

• a pressure closure assembly including
• a pressure relief valve having a central hub and a radially outer disc, and
• an inner shell having an inner shell base wall with a central valve retention aperture for retaining the central hub of the pressure relief valve of the pressure closure assembly, a semi-circular pressure relief slot extending partially circumferentially around the central valve retention aperture for exposing the radially outer disc of the pressure relief valve, a pressure relief pad at one end of the valve release aperture, and an outer skirt extending away from the inner shell base wall and including a circumferentially interrupted portion and a circumferentially continuous portion;
• and
• an outer release shell configured to be coupled to the pressure closure assembly, and including
• a semi-circular major portion having a major base wall configured to rest on top of a corresponding portion of the inner shell base wall when assembled, and a pressure relief tab projecting therefrom corresponding to the semi-circular pressure relief slot of the inner shell and configured to rest on the pressure relief pad when assembled, the major portion further having an outer skirt extending away from the major base wall and configured to wrap around the circumferentially interrupted portion of the outer skirt of the inner shell when assembled, and
• a semi-circular minor portion having a minor base wall stepped axially away from the major base wall and configured to be spaced above a corresponding portion of the inner shell base wall when assembled, and an outer skirt extending away from the minor base wall and diametrically larger than the outer skirt of the major portion.