A solenoid valve can be defined as a control unit that, when electrically energized or de-energized, either shut off or allows fluid flow.
According to the mode of actuation, solenoid valves can be distinguished as direct-acting valves, internally piloted valves, and externally piloted valves. Another distinguishing feature is the number of port connections.
To specify solenoid valves it needs to be defined the electric current they use, the mechanism they use to regulate the fluid and the type and characteristics of fluid they control.
A solenoid valve can use a two-port design to regulate a flow or use a three or more port design to switch flows among ports.
Multiple solenoid valves can be placed together on a manifold.
Controval offers solenoid valves to be used in a wide array of industrial applications, including general on-off control, calibration and test stands, pilot plant control loops, process control systems, and various original equipment manufacturer applications.