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valves
A valve is a evice that regulates the flow of materials (gases, fluidized solids, slurries, or liquids) by opening, closing, or partially obstructing various passageways. Valves are technically pipe fittings, but usually are discussed separately.
Trivia about valves
The heart has 4 of these to regulate the flow of blood, including the mitral
These include the bicuspid & tricuspid
If you listen to your heart using a stethoscope, you'll hear the sound of these flaps opening & closing
Inside the heart there are 4 of these; 2 semilunar, a bicuspid & a tricuspid
They're fingered to control the pitch of a trumpet