ADJUSTING VALVE DRIVE MECHANISM AND STEAM TURBINE

摘要

An adjusting valve drive mechanism (15) of a steam turbine drives an adjusting valve (13) which opens and closes a steam channel, through which steam flows, by a valve element (132) so as to adjust a flow rate of the steam serving as a working fluid of the steam turbine. The adjusting valve drive mechanism (15) includes a rotary motor (151), a spur gear (154) which is rotated by the rotary motor (151), and a chain (155) which meshes with teeth of the spur gear (154), advances and retracts in a predetermined advance/retract direction (S) which is a tangential direction of the spur gear (154) in accordance with rotation of the spur gear (154), and causes the adjusting valve (13) to advance and retract.