Solenoid Engine Valves

solenoid
A cylindrical coil of wire acting as a magnet when carrying electric current
a coil of wire around an iron core; becomes a magnet when current passes through the coil
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.
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.

engine
A thing that is the agent or instrument of a particular process
A machine with moving parts that converts power into motion
A railroad locomotive
locomotive: a wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks
something used to achieve a purpose; "an engine of change"
motor that converts thermal energy to mechanical work

valves
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
(valve) control consisting of a mechanical device for controlling the flow of a fluid
(valve) a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it
A device for controlling the passage of fluid through a pipe or duct, esp. an automatic device allowing movement in one direction only
(valve) device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone
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