Rotary Valve: Notes

The rotary valve assembly comprises the worm. See Figure . The valve sleeve, which has valve ports in its inner bore, is a snug fit into the worm and is retained with the trim screw. The input shaft, which is attached to the steering wheel via the steering shaft and steering column, also has valve ports on its outer diameter to align with those in the sleeve. The input shaft and sleeve valve ports are held in neutral alignment by the torsion bar, which is secured with pins at each end to the worm and input shaft.