EXHAUST VALVE
\ɛɡzˈɔːst vˈalv], \ɛɡzˈɔːst vˈalv], \ɛ_ɡ_z_ˈɔː_s_t v_ˈa_l_v]\
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In a steam-engine, the valve which regulates the passage of waste steam from the cylinder: a valve in the eduction passage of the steam cylinder of an engine, placed between the cylinder and air-pump, and wrought by the tappet-motion, so as to open shortly after the equilibrium valve, and admit the steam to the condenser.
By Daniel Lyons
