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valve (n.)

late 14c., "one of the halves of a folding door," from Latin valva (plural valvae) "section of a folding or revolving door," literally "that which turns," related to volvere "to roll," from PIE root *wel- (3) "to turn, revolve." Sense extended 1610s to "membranous fold regulating flow of bodily fluids;" 1650s to "mechanical device that works like an anatomical valve;" and 1660s in zoology to "halves of a hinged shell." Related: Valved.

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Definitions of valve from WordNet

valve (n.)
a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it;
valve (n.)
device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone;
valve (n.)
control consisting of a mechanical device for controlling the flow of a fluid;
valve (n.)
the entire one-piece shell of a snail and certain other molluscs;
valve (n.)
one of the paired hinged shells of certain molluscs and of brachiopods;
From wordnet.princeton.edu