Agilent Technologies 6890 Series, Service Manual, Page: 636 / 867

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Jun 2001
Valves
Agilent 6890 Gas Chromatograph Service Manual
Valves 1110
Liquid sample valves
Liquid sample valves
Agilent Technologies offers 4-port LSVs with 0.2, 0.5, or 1 µL internal loops.
These valves are designed for liquefied gases under pressure such as ethane,
propane, butane, LNG, etc. They are not intended for nonvolatile liquids (at
room conditions) where a concealed leak could allow an accumulation or pool
of liquid to form that may present a significant fire hazard.
All liquid sample valves have 1/16-inch fittings. The 0.5 µL size is available in
low- (1000 psig limit) and high-pressure (5000 psig) versions; the other sizes
are low-pressure (1000 psig) only.
An adjustable restrictor may be used on the sample outlet line to maintain
internal sample pressure to keep a compressed gas liquefied.
Temperature ranges
1/16-inch Teflon rotor valves 0 to 200
°
C
Adjustable restrictor valves Ambient to 225
°
C
Caution The life of an LSV is shortened if used outside its specified pressure and
temperature ranges. Highly dangerous leaks can occur if the valve box
temperature ever exceeds the specified temperature limits.
Adjustable restrictor valve
The adjustable restrictor supplied with a liquid sample valve is designed for
temperatures up to 225
°
C; it is NOT compatible with high-temperature valves.