/community-hubs/fluid-control-pneumatics/b/fluid-control-pneumatics-blog/posts/differences-between-direct-acting-and-pilot-operated-solenoid-valves-343797814According to the Solenoid valve page on Wikipedia at the time this post was written, the invention of these devices dates back to 1910 by ASCO, now part of Emerson . Solenoid valves are electromechanical devices: …in which the solenoid uses an electricen-USTelligent Community 13