69. What do hydraulically, servo-operated, automatic, changeover valves, used in a two-ram hydraulic steering gear accomplish?

Prevent either main pump from being hydraulically motored when idle by cross pressure flow
Prevent both units from operating simultaneously which could result in doubling the flow of oil and pressure leading to over pressurization of the system
Allow an alternate main pump to start in the fully loaded condition thus developing immediate full torque
Allows both units to operate simultaneously which result in doubling the flow of oil and speed of the steering gear

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