2. If tightening the fitting does not stop the leak, disconnect the
fitting from the valve. Occasionally, fittings stop leaking if
simply disconnected and then immediately reconnected. If the
leak continues, install a short length of tubing, with fittings,
between the pressure bolt and the suspect fitting. Connect the
fitting to the tubing with a union. A leaking fitting will also leak
inside the union. If necessary, replace the fitting. If you replace
the fitting, also replace the ferrule.
NOTE
When connecting or disconnecting fittings from the valve
pressure bolts, use a wrench to hold the bolt and prevent it from
turning.
3. Make sure all valve pressure bolts are evenly tightened. Refer to
Installation and Maintenance of the Dionex Inert High-Pressure
Valve (Document No. 032678) for the torque requirements.
Use caution as overtightening may break off the bolt in the
valve body.
4. If tightening the pressure bolts does not stop the leak, refer to
Section 5.7 for instructions to replace the port face.
5.5 Column Select Valve Air Leaks
An air leak around the valve piston or cap results in excessive
air consumption and may cause the valve to operate sluggishly
or not at all.
1. Remove the column switching valve from its mounting clip.
2. Make sure that the top and bottom caps are tight. If necessary,
tighten them fingertight.
3. If the leak continues, determine which end of the valve leaks by
activating the corresponding switch. Air will escape through the
vent hole when the leaking end is pressurized.
4. Disconnect the air line from the leaking cap. If necessary, use
the valve switch to turn off the air through the disconnected line.
5
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Service
Doc. 034859-02 9/93
5-5
Summary of Contents for LC20
Page 6: ...Contents iv Doc 034859 02 9 93 ...
Page 8: ...LC20 Chromatography Enclosure 1 2 Doc 034859 02 9 93 ...
Page 12: ...LC20 Chromatography Enclosure 2 2 Doc 034859 02 9 93 ...
Page 24: ...LC20 Chromatography Enclosure 2 14 Doc 034859 02 9 93 ...
Page 26: ...LC20 Chromatography Enclosure 3 2 Doc 034859 02 9 93 ...
Page 29: ...Figure 3 7 Drawing Sample 3 Operation and Maintenance Doc 034859 02 9 93 3 5 ...
Page 32: ...LC20 Chromatography Enclosure 3 8 Doc 034859 02 9 93 ...
Page 34: ...LC20 Chromatography Enclosure 4 2 Doc 034859 02 9 93 ...
Page 40: ...LC20 Chromatography Enclosure 4 8 Doc 034859 02 9 93 ...
Page 42: ...LC20 Chromatography Enclosure 5 2 Doc 034859 02 9 93 ...
Page 50: ...LC20 Chromatography Enclosure 5 10 Doc 034859 02 9 93 ...
Page 52: ...LC20 Chromatography Enclosure A 2 Doc 034859 02 9 93 ...
Page 56: ...LC20 Chromatography Enclosure B 2 Doc 034859 02 9 93 ...
Page 65: ...Figure B 6 Electrochemical Cell Plumbing Schematic B Installation Doc 034859 02 9 93 B 11 ...