1
Introduction
Functional Description
4
Accela Pump Hardware Manual
Thermo Scientific
pumps. In addition, the ruby ball and sapphire seat are virtually wear-free as opposed to the
polymeric membrane of a diaphragm valve, which becomes more brittle and less responsive as
it ages.
Purge Valve
The purge valve is located to the left of the LDA (see
Figure 3
). Turning the wingnut
counterclockwise opens the purge valve.
When the purge valve is open and the solvent flow is experiencing backpressure from either an
LC column or a backpressure regulator, mobile phase exits the LDA from the left side of the
outlet module, passes through the crossover tubing that connects the LDA to the pressure
transducer, and exits out the purge valve.
When the purge valve is closed, mobile phase flows out the front of the LDA assembly and
into the high-pressure tubing that connects the LDA to the mixer and the mixer to the
autosampler.
Figure 3.
View of the purge valve
A
B
C
D
PU RGE
PUL
S
E
D AMPENER
F LU
S
H
Purge valve
Connection to
autosampler
Dynamic
mixer
