How does a solenoid work?
Different solenoids have different air ports, either one or two. If the solenoid has one output then it could be normally-open or normally-closed. These are all changes used depending on the marker’s design, and are often not interchangeable. If you are familiar with Autocockers you’ll recognize the term three-way as the pneumatic valve that recocks the bolt. What these valves do is direct pressurized air to different ends of a pneumatic piston (commonly called the ram with Autocockers). In electronic markers, this pistion is connected to the sear, so it will push it up to fire the marker much like a mechanical trigger would. In electropneumatics, the piston will somehow fire the marker while the soleniod is open, then once it moves closed again it will discontinue the firing process and allow the marker to be recocked.
