Valves 6
Advanced Operation Manual 215
The Valve Box
The GC holds up to four valves in a heated valve box on top
of the oven.
The valve box is the preferred location for valves because it
is a stable temperature zone, isolated from the column oven.
Valves may also be mounted inside the column oven.
Heating the valves
The valve box contains two heated blocks, each with two
valve mounting locations (shaded in Figure 3). The middle
hole on each block is used to pass tubing into the column
oven.
If two valves are used, mount them on the same block. This
allows them to be heated using only one control channel
(Aux Temp 1 or Aux Temp 2, depending on how the heaters are
wired). With more than two valves, both channels must be
used for heating the two blocks. Set them at the same
temperature.
Figure 3 Diagram of valve locations on GC
Valve heater
blocks
Valve box,
cover removed
Back of chromatograph
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