963Operation of the rotary control valve and power cylinder

Neutral position (Figs 9.38(a) and 9.39(a)) With the steering wheel in its central free position, pressurized fluid from the pump enters the valve sleeve, passes though the gaps formed between the longitudinal groove control edges of both sleeve and rotor, then passes to both sides of the power cylinder. At the same time fluid will be expelled via corresponding exit 'sleeve/rotor groove' control-edge gaps to return to the reservoir. The circulation of the majority of fluid from the pump to the reservoir via the control valve prevents any buildup of fluid pressure in the divided power cylinder, and the equalization of the existing pressure on both sides of the power piston neutralizes any 'servo' action.

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