a valve through which burned gases from a cylinder escape into the exhaust manifold
gases ejected from an engine as waste products
a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it
device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone
one of the paired hinged shells of certain molluscs and of brachiopods
control consisting of a mechanical device for controlling the flow of a fluid
