Not quite home-improvement, however the engineering question lends itself to the expertise of the fine folks in this forum.
I am interested in pressurizing a hopper of tennis balls with a device like:
I would like the device to be limited to 12 PSI, so I am thinking a pressure relief valve for safety and that for simplicity, an electric pump to bring the pressure to 12 PSI and shut off automagically at the target presure.
Is there a simple and inexpensive control mechanism that can cut off the electric pump when it reaches the target pressure. Ideally one could 'dial in' the target pressure.
The goal is for the non-technical tennis player is able to quickly / easily / SAFELY pressurize and depressurize the container.