User manual

Bio-inert Quaternary Pump User Manual 11

Introduction

Overview of the Hydraulic Path

The bio-inert quaternary pump is based on a two-channel, dual-piston

in-series design which comprises all essential functions that a solvent delivery

system has to fulfill. Metering of solvent and delivery to the high-pressure side

are performed by one pump assembly which can generate pressure up to

600 bar.

Degassing of the solvents is done in a built-in vacuum degasser. Solvent

compositions are generated on the low-pressure side by a high-speed

proportioning valve (MCGV).

The pump assembly includes a pump head with an active inlet valve and an

outlet valve. A damping unit is connected between the two piston chambers. A

purge valve including a PTFE frit is fitted at the pump outlet for convenient

priming of the pump head.

The pump includes an active seal wash function, which cleans pistons and

seals for the use of buffer solutions.