throttle hole diameter

large-diameter water throttle

ratio of diameter of labyrinth passage to diameter of particle

above throttle valve EGR system

Adiabatic Throttle

air throttle

altitude throttle

Angle Throttle Valves

at full throttle

auto throttle

automatic throttle

automatic throttle control

automatic throttle valve

autothrottle

barrel throttle

barrel throttle valve

below throttle valve EGR system

butterfly throttle valve

by-pass throttle speed control