Replacing the Rotor Seal

The rotor seal forms a high-pressure seal between the stator and the
rotor. Replace the rotor seal when leaking occurs between the stator
and the stator ring or when you notice a decrease in injection
precision.
Stator
Stator ring
The lot ID sticker on the stator ring identifies the week and year
(WWYY) of the manufacture date.
Injection valves manufactured week 37 of 2008 or later have a
factory-applied, red mark on the valve body. The alignment of the
red mark on the valve body and the dimple on the pressure
adjustment nut corresponds to the optimal pressure setting for the
valve with the factory-installed rotor seal. Because the optimal
pressure setting depends on the rotor seal thickness, it is subject to
change when you replace the rotor seal.
The factory-applied red mark on injection valves manufactured
before week 37 of 2008 does not correspond to the optimal pressure
setting. You must make your own marks.
To replace the rotor seal, follow these procedures:
1. Removing the Injection Valve from the Autosampler
2. Disassembling the Injection Valve
3. Installing a New Rotor Seal
4. Reassembling the Injection Valve
5. Reinstalling the Valve and Checking for Leaks
Removing the Injection Valve from the Autosampler
To remove the injection valve from the autosampler
1. Disconnect the fingertight fittings from ports 2 and 3.
2. Using a 1/4-in. open-end wrench, loosen and remove the swaged
fittings from ports 5 and 6.
3. Using a #2 Phillips screwdriver, loosen and remove the two
screws that secure the valve to the autosampler, and then pull the
valve out of the autosampler.
Revision A 60157-97XXX
Copyright© 2008 Thermo Fisher Scientific Inc.
All rights reserved.
Replacing the Rotor Seal
Pressure
adjustment nut
Log ID Coupling unit
Ports 2 and 3
fingertight
fittings
Screw
Disassembling the Injection Valve
20 µL
2
3 1
4 6
5
Screw
Ports 5 and 6
swaged
fittings
To disassemble the injection valve
1. Determine the manufacture date of the valve.
2. For valves manufactured before week 37 of 2008, make reference
marks on the pressure adjustment nut and the valve body to
identify the current alignment.
Drive shaft
Coupling unit
Pressure adjustment nut mark
Valve body mark
CAUTION Do not remove the coupling unit
from the drive shaft of the injection valve. If you
do remove the coupling unit, return the valve to
Thermo Fisher Scientific for realignment.
3. Using a 9/64-in. hex wrench, remove the three socket head cap
screws that secure the stator to the valve.
3
2
1
4
5
6
Socket head
cap screws
CAUTION The polished (sealing) surface of the
stator contains six easily damaged ports. Avoid
touching this polished surface as you remove the
stator from the injection valve. Do not place the
polished surface face down on a hard surface.

4. Pull the stator off the valve. Place it on its side on a clean surface.
5. If the polished surface of the stator is scratched, replace the valve.
6. Pull the stator ring off the valve.
7. Pull the rotor seal off the three pins on the drive shaft.
8. Inspect the valve components for contamination. Clean as
necessary.
Installing a New Rotor Seal
To install a new rotor seal
Hold the rotor seal with the engraved flow passages facing away
from the drive shaft and mount the rotor seal onto the drive
shaft’s three alignment pins. The pins align with the rotor seal in
only one way.
Reassembling the Injection Valve
To reassemble the injection valve
1. Ensure that the drive shaft stop pin is positioned within the slot
in the valve body.
2. To mount the stator ring onto the valve body, align the body
locating pin with the alignment hole in the valve body. Then
insert the body locating pin into the alignment hole.
Log ID
sticker
Drive shaft
stop pin
7715-00
P/N
Polished sealing surface
Alignment hole
Rotor seal with three grooves
Alignment pins (for rotor seal)
Stator ring
Body locating pin
Alignment hole in the
valve body
Valve body
3. To mount the stator onto the stator ring, hold the stator with its
polished surface facing the stator ring. Align the alignment hole
in the stator with the stator locating pin on the stator ring. Then
insert the locating pin into the alignment hole.
2
Alignment
hole in the
stator
Stator locating
pin
7715-00
P/N
25 µL
Socket head
cap screws (3x)
Stator ring
4. Insert the three socket head cap screws into the stator.
5. Using a 9/64-in. hex wrench, tighten each screw a little at a time,
keeping the stator surface parallel to the stator ring surface.
6. If you have an adjustable torque wrench with a 1/4-in. shaft and a
hex driver attachment, evenly torque the three socket head cap
screws to 20 inch-pounds.
Reinstalling the Valve and Checking for Leaks
To reinstall the injection valve and check for leaks
1. Align the holes in the valve plate with the two small holes to the
left and right of the valve receptacle, and then insert the valve
drive shaft into the valve receptacle.
20 µL
Valve receptacle
2. Using a #2 Phillips screwdriver, tighten the screws that secure the
valve to the autosampler.
3. Reconnect the transfer tubing to port 2 and the waste tubing to
port 3. Hand-tighten the fittings.
4. Reconnect the heat exchanger outlet to port 5. Hand-tighten the
fitting, and then tighten the fitting an additional 90 degrees
(1/4 turn) with a 1/4-in. open-end wrench.
5. If the valve leaks between the stator and the stator ring, remove
the valve from the autosampler, and tighten the pressure
adjustment nut an additional 30 degrees with a 9/16-in. openend
wrench. Then reinstall the valve, and check for leaks.
Pressure
adjustment nut
Pressure adjustment nut
turned 30 degrees