Have you experienced valve shifting problems due to dirty and wet air?
Consider the Mac Advantage: The force between two electromagnets (the pole piece and armature in the solenoid) varies inversely with the square of the distance between them. This is displayed in the "Force Curve" shown here. Mac air valves use a very short stroke solenoid design to take advantage of this law of physics, resulting in a high shifting force from the solenoid.
Mac solenoid stroke = .014"
Solenoid stroke of typical air valve = .040"
Mac uses a patented oval-shaped armature in their solenoids, which allows for more coils of wire than a typical round armature in the same package size. These additional windings create greater electromagnetic force.
Mac also uses strong return springs in their valves, a benefit that would not be possible without the high shifting forces provided by the solenoid.
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