Vickers Hydraulic Vane Pump Part 1

Two Pressure Pump Action Automatic Control
It delivers the oil discharge from both pumps while the pressure is lower than the unloading valve setting are engaged.
The delivery of the oil discharge from only the small volume pump when the pressure is higher than the unloading valve setting are engaged.
Large pump discharge recirculates freely within the tank.

Double Pump Action Direct Acting Relief Valves
The outlet that delivers the oil discharge from the small volume pump and the outlet that delivers the larger volume pump.

Remote Control Unloading Valve
This is about the same as the two pressure pump action except that it delivers from both pumps and continues as long as the pressure is put toward the auxiliary pilot control. And even thou pressures are higher than the unloading valve settings. The pressure held upon auxiliary pilot control connection delays unloading valve action as needed.

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