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PGC5000
PGC5000 Series Service Instructions
7 Subassembly repair
SI/PGC5000-EN, Rev B
64
7.6.1 LSV disassembly on the analyzer
See Figure 7.9 for typical sample valve component location.
Stem
Stem
Seals
Piston Rod
O-Ring
Body
Body O-Rings
Tensioning Nut
O-Ring
Belleville
Springs
Rear
Valve Seat
Sample
Chamber
Tensioning Nut
Piston
Cone Point Set
Screws (2)
Cylinder
Fig. 7.9. Liquid Sample Valve Component Location
1. Stop the analysis at the end of a cycle.
2. Remove power from the analyzer.
3. Allow all temperature zones to cool, maintaining flow while the columns are cooling.
4. Turn off carrier, sample and air to the analyzer.
5. Open the isothermal oven door.
6. Verify that the bolt keeping the vaporizer from turning is tightened to 25 in-lb.
7. Disconnect the tubing coils from the Liquid Sample Valve.
8. Remove the two
cone point set screws
from the
cylinder
.
9. Slide the
cylinder
off the
piston
and
body
.
10. Using a hex key wrench, rotate the
tensioning nut
counterclockwise until the assembly is loose.
11. Unscrew the
body
from the
flange
and
vaporizer chamber
.
12. Withdraw the
piston
and the
piston rod
from the
tensioning nut
.
13. This will free the
seals
from the
stem
.
14. Replace the
seals
.
15. Inspect the stem for visible imperfections. If imperfections are found, replace the stem.
16. Remove the
rear valve seat
from the
body
.
17. Remove the 15
Belleville springs
from the
body
.
18. Inspect the
body O-rings
for visible imperfections. If imperfections are found, remove the
body O-rings
from the
body
and
piston
.
19. Unscrew the
piston rod
from the
piston
and extract the
stem assembly
from the
piston rod
.
20. Inspect the
piston rod O-ring
for visible imperfections. If imperfections are found, remove the
piston rod
O-ring
from the
piston rod
.
21. Unscrew the
tensioning nut
from the
body
.
22. Inspect the
tensioning nut O-ring
for visible imperfections. If imperfections are found, remove the
O-ring
from the
tensioning nut
.
7.9.2 LSV reassembly on the analyzer
In all steps the lubricant used is High Vacuum Grease, ABB part number 006904-1.
1. Clean the
seals
with acetone and air dry them.
2. Clean the
sample chamber
with acetone and air dry it.