Dionex LC20, Руководство оператора, Страница: 46 / 70

5. Unscrew the leaking cap from the valve body (Figure 2-3).
Inspect the cap O-ring for cracks and replace if necessary
(P/N 038650).
6. Press the disconnected air line (Step 4) against the small vent
hole between ports 1 and 5. Activate the valve switch to apply
air pressure against the slider. The piston will pop out of the
valve body.
7. Inspect the piston O-ring for cracks and replace if necessary
(P/N 038651).
8. Carefully lubricate the piston O-ring with a small amount of
silicone grease.
Use the grease sparingly. Excess grease may contaminate
the eluent.
9. Press the piston back into the valve body.
10. Make sure that the cap O-ring is inside the cap. Screw the cap
back onto the valve body. Tighten it only fingertight.
11. Reconnect the air line to the valve.
5.6 Cleaning the Column Select Valve Slider
A dirty or plugged valve slider causes excessive system
backpressure and may cause poor chromatographic
performance.
1. Turn off the pump and the eluent selector valves.
2. Remove the plugged valve from its mounting clip (see Figure 2-3
3. Disconnect the air line from one cap. If necessary, use the valve
switch to turn off the air through the disconnected line.
LC20 Chromatography Enclosure
5-6
Doc. 034859-02 9/93