MAINTENANCE
CAUTION: Hot
Before carrying out the following steps,
switch off the heaters and allow the oven
and liquid injection valve to cool down!
Removing the liquid injection valve
n
Switch off sample flow in conditioning cabinet
n
Allow sample line to empty, and purge line
n
Move injection tappet to filling position (against ex-
ternal wall of cylinder)
n
Switch off chromatograph
n
Shut off carrier gas and control air
n
Unscrew sample line and control line on liquid injec-
tion valve
n
Only if you wish to completely remove the liquid in-
jection valve: dismount the carrier gas inlet line and
the vaporizer outlet in the oven, and then completely
remove the valve.
Dismounting the liquid injection valve
n
Unscrew the valve body (3) from the flange (8) with
vaporizer (7), and separate
n
Unscrew the two hexagon screws (11) on the control
cylinder (1), loosen the control cylinder and remove
n
Lift off the vaporizer (7), sample flow unit (5) and
adjustment assembly (4) from the injection tappet
n
Remove the sample flow unit and the lenticular gas-
ket (if the latter has not remained stuck in the vapor-
izer), allow the plate springs to drop out
n
Pull the control piston with tappet (22) out of the
valve body (3). Do not insert any aids such as a
screwdriver into the gap between the piston and the
valve body. This would damage the valve body and
control piston.
Cleaning vaporizer, injection tappet,
injection hole and sample flow unit
n
Clean the interior of the vaporizer using an appropri-
ate solvent. Remove insoluble components using a
3.3-mm diameter drill.
IMPORTANT: Internal diameter
The internal diameter of the vaporizer hole
must now be 3.3 mm. Older versions have a
diameter of 3.5 mm. Check using a
drill/reamer!
n
Clean the sample flow unit with the same solvent.
Remove stubborn residues using a drill.
n
Clean the surface of the injection tappet using sol-
vent. If this is not possible, clean the tappet using a
soft cloth and a little polishing paste. Make sure that
the tappet is not tapered at any point.
n
If the cross-hole in the dosing tappet is blocked, push
through with a soft wire (e.g. copper wire with insu-
lation), and blow free with compressed air. The
cross-hole must not have any burr on the outside; re-
move manually if necessary using a twist drill and
subsequently polish with a soft cloth.
2-VI Register8.vp Stand: 20.11.2000
Liquid injection valve
1
21
43
5
22
7
91
9
2
3
6
11
23
23
4
42/41
11
32
31
92
93
8
Liquid injection valve
1 Control cylinder
11 Hexagon screw
2 Control piston
21 Guide pin
22 Injection tappet
23 O-ring, large
3 Valve body
31 Label for dosing volume
32 O-ring, small
4 Adjustment assembly with nut (41) and conternut (42)
43 Plate springs (8 off)
5 Sample flow unit
6 Lenticular gaskets
7 Vaporizer
8 Flange
9 Heating mushroom
91 Heating cartridge
92 Temperatur sensor
93 Safety temperature limiter
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