In order to reduce the uncertainty of electric flow diverter

improve its stability and reliability

and make it more convenient to be used in industrial field

a method of double-optoelectronic timing and positioning is proposed and tested

for the electric flow diverter directly driven by step motor

on the basis of analyzing the working principle and defects of single optoelectronic timing method. Theoretical analysis and verification results using flowmeter method show that the value of uncertainties of flow diverter timing at central points and both sides of the nozzle are relatively similar as the performance of the motor is very stable. Based on the double optoelectronic switches

electric flow diverter can realize automatic positioning and reset of the flow distributor. As a result

the problem of position judgment and automatic positioning of the flow distributor after power on is solved.The test data by transfer time difference method conformed that the uncertainty of the electric flow diverter can reach 0. 000 6 %.