Abstract: A system and method for storing coffee beans in a vacuum environment and dispensing them into an external environment at atmospheric pressure is provided. An upper valve selectively passes coffee beans from a hopper to a metering chamber when open and forms an airtight seal between the metering chamber and the hopper when closed. A lower valve selectively dispenses the coffee beans from the metering chamber when open and forms an airtight seal between the metering chamber and the external environment when closed. An actuator mechanism synchronously operates the upper and lower valves to establish and maintain a vacuum environment in the hopper while dispensing an accurate quantity of coffee beans on demand.