What does a solenoid do for electro-pneumatic markers?
In electropneumatic markers, the solenoid actuates the movements of some variety of air piston to fire the marker. The piston may be part of the markers valve or it may be connected to the hammer. Q: What is dwell? A: Dwell is the amount of time the solenoid remains open, which usually translates to the amount of time the marker takes to fire. This number is usually less than 20 milliseconds. Q: What is a spool? A: The spool is the part of the solenoid that actually directs the air flow. It is the main moving part of the solenoid; it is the part with the o-rings around it. This is the equivalent of an Autococker three-way valve’s shaft. Don’t be confused with the term spool valve design, which generally refeers to a certain type of marker (one which only has one moving part, the bolt).
