Solenoid Actuated Valve

solenoid
a coil of wire around an iron core; becomes a magnet when current passes through the coil
The solenoid defines the packing of DNA as a 30nm fiber of chromatin and results from the helical winding of at least five nucleosome strands.
A cylindrical coil of wire acting as a magnet when carrying electric current
A solenoid is a three-dimensional coil wound into a tightly packed helix. In physics, the term solenoid refers to a loop of wire, often wrapped around a metallic core, which produces a magnetic field when an electric current is passed through it.

actuated
(actuate) trip: put in motion or move to act; "trigger a reaction"; "actuate the circuits"
(actuate) motivate: give an incentive for action; "This moved me to sacrifice my career"
Cause (someone) to act in a particular way; motivate
moved to action; "a man actuated by unworthy desired"
Cause (a machine or device) to operate

valve
A device for controlling the passage of fluid through a pipe or duct, esp. an automatic device allowing movement in one direction only
control consisting of a mechanical device for controlling the flow of a fluid
A membranous fold in a hollow organ or tubular structure, such as a blood vessel or the digestive tract, that maintains the flow of the contents in one direction by closing in response to any pressure from reverse flow
a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it
device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone
A cylindrical mechanism in a brass instrument that, when depressed or turned, admits air into different sections of tubing and so extends the range of available notes