A device that controls the flow of a gas or fluid through a pipe.
One of the pieces or divisions of bivalve or multivalve shells.
One of the pieces into which certain fruits naturally separate when they dehisce.
One of the two similar portions of the shell of a diatom.
A device that admits fuel and air into the cylinder of an internal combustion engine, or one that allows combustion gases to exit.
One or more membranous partitions, flaps, or folds, which permit the passage of the contents of a vessel or cavity in one direction, but stop or control the flow in the opposite direction
A vacuum tube.
A small portion of certain anthers, which opens like a trapdoor to allow the pollen to escape, such as in the barberry.
One of the leaves of a folding-door, or a window-sash.
To control (flow) by means of a valve.
A wheel, propelled by running or falling water, used to power machinery.
A wheel with buckets used to raise water.