User manual

1260 Nanoflow Pump User Manual 13

Introduction to the 1260 Infinity Nanoflow Pump

Introduction to the Pump

closes the outlet valve, preventing any chamber 2 solvent from back-streaming

into chamber 1. After a predefined piston 1 stroke length, the servo motor is

stopped, and the active inlet valve is closed. The pistons now reverse

directions. Piston 1 begins its delivery stroke (high pressure), and piston 2

begins its intake stroke. Piston 2 is moving at only half the speed of piston 1.

The outlet valve is forced open by the pressure generated by piston 1. Piston 1

begins to deliver the volume previously sucked into chamber 1. Because of the

2:1 speed ratio of the pistons, half of the solvent flow from chamber 1 is forced

out of the pump head, continuing into the pump hydraulic path. The other half

of the flow from chamber 1 simultaneously refills chamber 2.

When piston 1 has completed its delivery stroke, the pistons reverse direction,

and the cycle is repeated.

Figure 3 Operating Principle of the Pump Head

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