HP 5890 SERIES II Service Manual page 237

VALVES
This section is intended to help the technician isolate problems to a specific valve component or com-
ponents. The HP 5890 Series II may be found in many different configurations, with varying component
options. This complicates the process of providing detailed troubleshooting procedures for even gener-
al problems. But, by using the general troubleshooting techniques presented here, successful results
should be achieved.
Specific part numbers are not given in this portion of the service manual. For all replacement part num-
bers, refer to the Section 7 of the IPB portion of this document.
This document is not meant to provide instruction for first time installation of any of the options dis-
cussed. The add- on sheets, which accompany the various options, exist for just this purpose, and
should be referenced when performing a first time installation.
VALVES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VALCO VALVES 18900F
General Purpose Valves (GPVs)
Adjustable Restrictors
Gas Sample Loops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LIQUID SAMPLE VALVES (LSVs)
Troubleshooting and Maintenance
Chromatographic Symptoms
Loss of Sensitivity or Excessive Drift
Loss of Peaks in Specific Areas of the Chromatogram
Baseline Upsets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Extraneous Peaks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Locating Leaks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pressure Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Valve Box Assembly Removal
Valve Actuator Alignment
Valve Actuation of GC- Controlled Valves
Valve Configuration Diagrams
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TABLE OF CONTENTS
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SVC 7- 1
Section 7
SVC 7- 1
SVC 7- 2
SVC 7- 2
SVC 7- 4
SVC 7- 5
SVC 7- 5
SVC 7- 6
SVC 7- 7
SVC 7- 7
SVC 7- 7
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SVC 7- 7
SVC 7- 8
SVC 7- 8
SVC 7- 8
SVC 7- 15
SVC 7- 16
SVC 7- 17
SVC 7- 18