17 Maintaining a Valve
To Align a Rotary Valve Rotor
270 Maintaining Your GC
To Align a Rotary Valve Rotor
1 Gather the following:
• Flathead screwdriver
• 3-mm hex key wrench
• T-20 Torx screwdriver
2 Set the oven and valve box heated zones to a safe handling temperature (25 °C).
3 Set all valves to Off.
The oven, inlet, detector, and valve box may be very hot. If they are hot, wear heat-resistant
gloves to protect your hands.
4 Loosen the adjustment set screw.
5 Locate the rotor adjustment shaft on top of the actuator. Using a flathead screwdriver,
rotate the valve rotor counterclockwise until it stops, then back it off a small amount to set
one end of the rotor’s motion (< 1 mm).
6 Tighten the adjustment set screw.
7 Turn the valve On, turn Off to check for smooth operation.
8 Restore the analytical method.
Rotor adjustment
slotted shaft
Adjustment set screw
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