Capsules with degassing valves

A capsule for use in a machine for preparing a liquid product from soluble or extractable products using a pressurized extraction fluid, the capsule comprising:

• a container body made of compostable material and defining a closed chamber for preparation of the liquid product inside the closed chamber using the pressurized extraction fluid, the closed chamber housing the soluble or extractable products, wherein the pressurized extraction fluid is supplied through an injection element of the machine, the container body having a first base, a second base, and a side wall extending along a longitudinal direction between the first base and the second base, wherein the first base has a thickness;
• an injection lid, sealingly associated to the container body and designed to be opened to allow the pressurized extraction fluid to enter the closed chamber;
• a beverage dispensing lid, sealingly associated to the container body and designed to be opened to release a beverage prepared from the soluble or extractable products and the pressurized extraction fluid;
• and
• a degassing valve made of compostable material, the degassing valve comprising:
• a valve body formed as a part of the first base, the valve body having a recess inside the thickness of the first base;
• a membrane arranged inside the recess of the valve body, wherein the membrane is movable between a first operating position, which allows passage of gases from the closed chamber to outside of the capsule, and a second operating position, which prevents the passage of the gases and entry of the pressurized extraction fluid into the closed chamber, wherein the first operating position is allowed when reaching a predetermined gas threshold value;
• and
• holding means that cover the recess of the valve body to prevent loss of the movable membrane;
• wherein the first base, when viewed from the outside of the capsule, comprises:
• a central portion;
• and
• an annular portion surrounding the central portion;
• wherein the annular portion is recessed with respect to the central portion,
• wherein first openings are provided in the annular portion of the first base for passage of the pressurized extraction fluid,
• wherein the injection lid has a first area covering the first openings, a second area including at least one notch putting the degassing valve in fluid communication with the closed chamber, and a third area dividing the first and second areas,
• wherein the injection lid is sealed to the first base all along the third area,
• wherein the first base has second openings between the movable membrane and the third area,
• wherein the degassing valve is actuated in an open configuration by the gases released by the soluble or extractable products and in a closed configuration by the pressurized extraction fluid,
• wherein the degassing valve is in fluid communication with the closed chamber through the at least one notch, and
• wherein the pressurized extraction fluid is able to enter the closed chamber only after the injection lid has been opened.