Abstract: The faults of the electric actuators used in Baotou Power Generation Branch of Huadian Inner Mongolia Energy Company Limited were occurred frequently, which reduce the equipment reliability greatly; and the optimal control effect can not be obtained. The electric actuators for the inlet gas baffle of air preheater, the electric actuators for the attemperating water adjusting valve of the boiler superheater and the electric actuators for the butterfly valve of water circulating system all were transformed into split type electric actuators. The reliability of the reformed electric actuators was increased greatly; the hidden danger of the equipments was eliminated thoroughly; the maintenance cost was decreased; and the favorable effect was obtained.

Key words: split type actuator, equipment fault, reliability, technical reformation, reformation effect