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valve
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 valve
In a vein it's 2 or more cusps arranged to allow blood to flow in only one direction
When these need to be replaced, it's generally the ones on the left side of the heart, where the pressure's higher
(Jimmy of the Clue Crew reports from the Cleveland Clinic.) Robin Williams thanked the Cleveland Clinic team for his heart surgery, saying after getting a replacement one of these from a cow, "the grazing's been fun"