Beer dispensing machines and mechanical systems for infusing and mixing gases, including nitrogen, carbon dioxide, and custom gas blends, into beer for consistent carbonation, nitrogenation, and foam stability; components for gas-infused draft beer dispensing systems, including gas regulators, gas mixers, gas generators, gas cylinders, infusion chambers, and foam detectors; mechanical draft beer systems designed to deliver optimized taste, texture, and beverage quality for use in commercial, ...