Agilent Technologies 6890 Series Service Manual page 635

1110 Valves
General purpose valves
General purpose valves
The 6- and 10-port general purpose valves are suitable for column switching,
isolation, backflushing, and other uses as well as gas sampling.
Gas sample valves
The standard gas sample valves have 1/16-inch zero dead volume fittings and
an internal port diameter of 0.016-inch.
5
CCW
stop
6
Figure 1110-2
Gas sample loops
A 0.25 mL sample loop is included with all gas sampling valve systems. 10 mL
and 5 mL loops occupy one valve position, limiting the number of valves that
can be housed in a valve compartment.
Adjustable restrictor valves
Adjustable restrictors are used to balance flow resistance between the two
valve positions. They are available with ambient to 225°C (part no. 0101-0633)
or ambient to 350°C (part no. 0101-0948) operating ranges.
4 of 6
4
3
5
6
2
1
OFF
6-port valve (actuator side view) showing flow path grooves
Valves
Agilent 6890 Gas Chromatograph Service Manual
4
3
CW
stop
2
1
ON
Jun 2001