HP 5890 SERIES II Service Manual page 245

Sampling Valve System
Introduction
An installed valve system is an integral part of the HP 5890 SERIES II, GAS CHROMATOGRAPH. To
prolong the life of the valve system, avoid the following operational abuses:
Exceeding the specified temperature and pressure ranges.
D
Plugging a valve with column packing or sample precipitation.
D
Scoring of valve surfaces with column packing or particulates in liquid or gas sample.
D
Contaminating the system with samples (noneluting materials) or poor quality support gases.
D
Valves
Valves are composed of two basic assemblies: a body and a rotor.
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The body assembly and its component parts are made from Nitronics 60, nickel steel. If required the
valve may also be produced from Hastelloy C. External tubing (plumbing) is connected to the valve
body ports by ferrules and fittings provided with the instrument.
All general purpose valve bodies include mechanical stops in their index lips. The stops limit rotor rota-
tion (i.e., 60 degrees,90 degrees), so the correct flow path results when the index pin is close to or
against either stop of the index lip.
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Multipurpose Valve
Ports Low Temp. High Temp.
6 0101- 0629 0101- 0584
10 0101- 0630 0101- 0585
Liquid Sampling Valves
Ports Volume Pressure Valve
4 0.2ul 1000 0101- 0636
4 0.5ul 1000 0101- 0637
4 1.0ul 1000 0101- 0638
4 0.5ul 5000 0101- 0639
SVC 7- 9