Thermo Scientific SOLA II, User Manual

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Thermo Fisher Scientific SOLA II User Guide B-1
Appendix B
Rotary Valve Service
Some applications use rotary valves manufactured by Valco Instruments Co.
Inc. (VICI). This appendix describes operation and cleaning instructions for
the valves typically used. The material in this appendix is taken from VICI
Technical Note 201 (TN-201 9/00), copyright 2000 VICI and from VICI
Technical Note 409 (TN-409 4/01), copyright 2001 VICI. Technical Notes used
with permission (www.VICI.com).
Caution
The sample line must be purged with air to remove all sample prior
to performing valve maintenance to prevent sample leaking to the pyrolyzer.
Open the oven and disconnect the tubing from the injection valve to the
pyrolyzer before servicing the valve.
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Note
For Valco W and UW Type valves.
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After unpacking the valve, do not remove the protective tape from the valve
ports until you are ready to install the valve. As supplied, all surfaces are clean
and free of contaminants, and must be kept clean to prevent valve damage.
Open ports and fittings cause unnecessary risk of particulate matter entering
the valve and scratching the sealing surfaces, which is the most frequent cause
of premature valve failure.
Note
The most common source of particulate and chemical contamination is
tubing which has not been properly cleaned before installation in the valve. To
avoid this problem, Valco Instruments suggests using their electrolytically pre-
cut and polished tubing, available in standard lengths for any plumbing
requirement.
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Note
If other tubing is to be used, make certain that all tubing ends are free
of burrs and cut square with the tube axis, and that all tubing has been
cleaned chemically and mechanically.
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Initial
Precautions