Agilent Technologies 7820A Manual page 280

15
Maintaining a Valve
WA RN IN G
280
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 282.) Vacuum any RCF insulation
particulates from the valve box area.
7 Note the tubing connections to the existing valve and label if
desired.
Disconnect the existing valve fittings.
8
Remove the two T-10 Torx screws attaching the valve to the
9
valve box, then remove the valve from the valve box.
Place the new valve in the valve box. The gap in the index
10
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.
Use needle-nosed pliers to move the valve rotor index pin of
11
the valve counterclockwise until the pin touches the valve
stop Off position.
"To Remove the Upper
Maintaining Your GC