Digital servo-valve

摘要: An hydraulic rotary valve is provided which permits the accurate control in an open loop system of position a plate for directing flow or pressure between multiple paths. Mechanical centering means are returning to predetermined closed whenever power turned off lost stepper motor comprising actuating means. A linked and machine intelligence controlling operation provided, including registering when mechanically returned position, determining required number electrical pulses at desired frequency sufficient activate degrees rotation output shaft advance return (in clockwise counterclockwise rotation) position. No feed back sensors constantly measure actual plate.