Rotary control valve at neutral (Steering)

Rotary control valve at neutral

1 Worm gear 2 Torsion bar 3 Valve sleeve 4 Pin

5 Input shaft and valve rotor 6 Piston/rack 7 Coarse spline 8 Spline (torque shaft to worm gear)

When there is no demand for assistance the torsion bar holds the ports in the valve sleeve and valve rotor in a neutral relationship to one another. The ports in the valve sleeve and the valve rotor are so aligned to allow equal (low) fluid pressure on each side of the piston. Excess fluid flows through ports in the valve rotor through the valve sleeve and back to the reservoir.