Bottle Cap Pressure Regulator

This is the design for a pressure regulator that sits on top of a normal plastic bottle. Because some parts are quite small and others require smooth sliding or sealing surfaces, this design is only suited for resin printers.

On the output side, a 6mm OD plastic hose is used.
To fill the bottle, eriher a compressorcan be attached to the 1/4 inch thread, or a bike valve can be screwed in.
When using 1/4 inch adapter with rubber seal, a check valve can be added with a spring and a BB.

Output pressure can be set by the nozzle/seat area combination, spring constant and pre-tension of the spring.

The dummy plug is not needed. It can however be used to replace the bottle for testing, or when a compressor is used.