Beverage dispenser and variable pressure regulator cap assembly

A regulator cap assembly comprising:

• a cap body;
• a high pressure cavity at least partially defined by the cap body, wherein the high pressure cavity is configured to receive pressurized gas from a compressed gas reservoir;
• a low pressure cavity at least partially defined by the cap body, wherein the low pressure cavity is connected to the high pressure cavity via a high pressure gas passageway, wherein the low pressure cavity defines a low pressure gas passageway that penetrates the cap body;
• a piston seat positioned on a high pressure cavity side of the high pressure gas passageway;
• a piston at least partially positioned in the high pressure cavity, the piston configured to regulate introduction of the pressurized gas into the high pressure gas passageway;
• an ambient pressure cavity at least partially defined by the cap body;
• a diaphragm positioned between the ambient pressure cavity and the low pressure cavity, wherein the diaphragm includes a piston translation portion configured to translate the piston relative to the piston seat and a spring surface defining a boundary of the ambient pressure cavity;
• a drive screw that defines a first portion of a threaded connection;
• a spring hat that includes a second portion of the threaded connection;
• and
• a main spring positioned between the spring surface of the diaphragm and the spring hat, wherein rotation of the drive screw translates the spring hat to affect compression of the main spring against the diaphragm.