Agilent Technologies Agilent 7890 Series Maintenance Manual page 342

19
Maintaining a Valve
WA R N I N G
342
The valve box insulation is made of refractory ceramic fibers
(RCFs). To avoid inhaling RCF particles, we recommend these
safety procedures:
1. Ventilate your work area
2. Wear long sleeves, gloves, safety glasses, and a disposable
dust/mist respirator
3. Dispose of insulation in a sealed plastic bag
4. Vacuum any residual particles and discard
5. Wash your hands with mild soap and cold water after handling
RCFs.
6 Remove the upper valve box. (See
Valve Box" on page 344.) Vacuum any RCF insulation
particulates from the valve box area.
Note the tubing connections to the existing valve and
7
label if desired.
Disconnect the existing valve fittings.
8
Remove the two T- 10 Torx screws attaching the valve to
9
the valve box, then remove the valve from the valve box.
10 Place the new valve in the valve box. The gap in the
index ring on top of a 6- port valve points toward the
back of the GC if installed correctly. This is the On
position. Install and tighten the two screws with a
screwdriver.
11 Use needle- nosed pliers to move the valve rotor index pin
of the valve counterclockwise until the pin touches the
valve stop Off position.
"To Remove the Upper
Maintaining Your GC