240
Agilent 7820 GC Service
Actuators
Valve rotors are driven by air-operated actuators. The air is
controlled by solenoid valves inside the right side panel.
Installing the actuators
The actuators use pneumatic pressure (40 to 70 psi) to switch
the valves between their two positions.
1 After installing the valves and valve box as described in the
Valve Box ( 234) section, you can install the valve actuators.
Set each actuator to the appropriate degree of rotation. Move the
grenade style pin to the hole on the actuator marked with the
correct degree of rotation, as shown below:
 Four port valves—Place the pin in the 90° hole
 Six port valves—Place the pin in the 60° hole
 Ten port valves—Same as six port valves, but with the
tubular 36° actuator limiter on the pin.
Mount an actuator over each valve installed using two Torx T-20
screws.
Engage the actuator drive shaft coupler with the valve.
a Loosen the hex nut on the actuator near the drive shaft.
b Slide the shaft down.
c Insert a flat bladed screw driver in the slot on the top of
the actuator and turn the shaft back and forth until you
feel the coupler engage the valve.
d Tighten the set screw.
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