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The Collaborative International Dictionary
Throttle valve

Throttle \Throt"tle\, n. [Dim. of throat. See Throat.]

  1. The windpipe, or trachea; the weasand.
    --Sir W. Scott.

  2. (Steam Engine) The throttle valve.

    Throttle lever (Steam Engine), the hand lever by which a throttle valve is moved, especially in a locomotive.

    Throttle valve (Steam Engine), a valve moved by hand or by a governor for regulating the supply of steam to the steam chest. In one form it consists of a disk turning on a transverse axis.

WordNet
throttle valve

n. a valve that regulates the supply of fuel to the engine [syn: accelerator, throttle]

Usage examples of "throttle valve".

The steam passes up into the steam dome, from which it is released to the cylinders by the throttle valve.

Suspended above its massive black-iron boiler the locomotive had a curious long, thick pipe, almost like a second and thinner boiler, bridging the two bowler-hat-like domes that housed the throttle valve and safety valve.

As Hunt eased the throttle valve open with a screwdriver, the pitch rose, then settled at a smooth, satisfying whine.