/community-hubs/deltav-community-connect/b/delta-vweblog/posts/simplifying-pneumatic-valve-manifold-engineering-and-installationWikipedia defines a solenoid valve as an: … electromechanically operated valve . The valve is controlled by an electric current through a solenoid : in the case of a two-port valve the flow is switched on or off; in the case of a three-port valveen-USTelligent Community 13