1 Installing the GC
Installation and First Startup 47
Step 15 Connect valve actuator air (if present)
Valves are driven by air actuators. Valves should have a dedicated air source; they cannot
share detector air supplies.
Do not share air between a detector and valves.
Valves can use nitrogen as an alternate supply. In this case, the nitrogen does not have to be
chromatographic grade but must be free from contaminants.
Valve actuator air is supplied through 1/4-inch plastic tubing. If your GC was ordered with
valves, the plastic tubing will already be attached to the actuators and will extend from the
back of the GC. Additional valves are shipped with a 1/4 to 1/8-inch reducing union to be used
in plumbing.
Route the tubing away from the oven exhaust. The hot air will melt the plastic tubing.
Turn off the air supply at the source. If needed, shorten the supplied plastic tubing using a
sharp knife. Connect the tubing to the air source using a 1/4-inch Swagelok nut and ferrules.
See Figure 13.
Figure 13. Valve actuator air tubing
Hole for
actuator air
tubing
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