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Introduction to the Quaternary Pump
Overview
Overview
The quaternary pump is based on a two-channel, dual plunger 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 400 bar.
Degassing of the solvents is done in a vacuum degasser and solvent
compositions are generated on the low-pressure side by a high-speed
proportioning valve.
The pump assembly includes a pump head with an active inlet valve which
has an replaceable cartridge, and an outlet valve. A damping unit is
connected between the two plunger chambers. A purge valve including a
PTFE frit is fitted at the pump outlet for convenient priming of the pump
head.
A continuous seal wash (optional) is available when the quaternary pump is
used with concentrated buffer solutions.
Figure 41 Hydraulic Path of the Quaternary Pump
Inlet
valve
Outlet
valve
Damper
To sampling
unit and
column
To waste
From
solvent
bottles
Vacuum chamber (Degasser)