User manual | Agilent_4890_5890_6890_Gas_Chromatograph_Rotary_Valves

Agilent 4890, 5890, 6890
Gas Chromatograph
Rotary Valves
Installation Guide
Agilent Technologies
Notices
© Agilent Technologies, Inc. 2002
No part of this manual may be reproduced in
any form or by any means (including electronic storage and retrieval or translation
into a foreign language) without prior agreement and written consent from Agilent
Technologies, Inc. as governed by United
States and international copyright laws.
Manual Part Number
G2739-90107
Edition
First edition, April 2002
Printed in USA
Agilent Technologies, Inc.
2850 Centreville Road
Wilmington, DE 19808-1610 USA
Safety Notices
CAU TI O N
A CAUTION notice denotes a hazard. It calls attention to an operating procedure, practice, or the like
that, if not correctly performed or
adhered to, could result in damage
to the product or loss of important
data. Do not proceed beyond a
CAUTION notice until the indicated
conditions are fully understood and
met.
WA RN ING
A WARNING notice denotes a
hazard. It calls attention to an
operating procedure, practice, or
the like that, if not correctly performed or adhered to, could result
in personal injury or death. Do not
proceed beyond a WARNING
notice until the indicated conditions are fully understood and
met.
2
Installing Rotary Valves
Installing Rotary Valves
These instructions describe how to use the hardware kits to
install a new valve in your Agilent Technologies’ 4890, 5890, or
6890 series Gas Chromatograph (GC).
Table 1
Parts supplied
Description
Kit G2739A
(Liquid sample)
Metering valve 1/16-inch
1
Screw, M3 x 8 mm
2
1
Screw, M3 x 30 mm, chrome-plated
2
1
Label
1
1
Screw, thread-cutting
4
Screw, M4 x 12 mm, Torx™ T-20
4
Fitting, column bulkhead
1
4
Nut, 5/16-inch
1
4
Restrictor bracket
1
1/16-inch SS tube, 102 mm long
1
1/16-inch SS tube, 203 mm long
Kit G2740A
(Gas sample)
1
1
1/16-inch SS tube, 360 mm long
1
2
1/16-inch SS tube, 400 mm long
1
1
1/16-inch SS tube, 560 mm long
1
5
1/8-inch nut and ferrule set
1
1
Filter union, reducing
1
Reducer/restrictor, SS
1
Actuator limiter, 36 degrees
0
1
Installation sheet (this document)
1
1
Agilent Technologies
Installing Rotary Valves
Part Identification
Tubing
Nut and ferrule set
Screws
Restrictor bracket
Metering valve
Nut
Figure 1
Kit G2739A, Liquid Sample Valve
Tubing
Actuator
limiter
Reducer/restrictor
Screws
Nut and ferrule set
Filter
union
Nuts
Column bulkhead fittings
Figure 2
2
Kit G2740A, Gas Sample Valve
Installing Rotary Valves
Installing Rotary Valves
If you purchased a heated valve box (19238A/B, G1580A, or
G1581A), or a side mount kit (G2748A or G2749A), install it
before installing your valve.
To install a valve in a heated valve box, see page 3.
To install a valve on a side mount bracket, see page 8.
Tools needed
Torx T-10 and T-20 drivers
Flat blade screwdriver
Needle-nose pliers
3 mm hex key wrench
Installing a valve in a heated valve box
WA RN ING
Do not install a liquid sampling valve (LSV) in the valve box if you
plan to heat the box above 75°C. Heating an LSV over 75°C can cause
a leak and subsequent explosion. Liquid sampling valves should be
mounted in the side location to avoid potential explosions.
The oven, inlet, detector, and valve box may be very hot. Before
proceeding, turn off the oven and all other heated zones and let them
cool down.
Harmful gases may be present. Hydrogen (if used) can present an
explosion hazard. Before proceeding, turn off all supply gases at
their sources.
Shock hazard. Before proceeding, turn off the GC and disconnect the
power cord.
1 If the detector top cover is installed, remove it.
2 Remove the upper valve box. Remove the two mounting
screws using a T–20 Torx screwdriver and lift off the upper
valve box. Set it aside.
Installing Rotary Valves
3
Installing Rotary Valves
Mounting screws
Upper valve box
Heater/sensor wires
Lower valve box
Figure 3
Opening the valve box
3 Remove the heater block mounting screw in the lower valve
box.
Valve 4
Valve 3
Remove the screw in
the heater block at the
position where you
will install the valve.
Valve 2
Valve 1
Figure 4
Removing the heater block screw
4 Place the valve in the desired position in the valve box. The
valve rotor index pin of a 6–port valve points toward the
4
Installing Rotary Valves
Installing Rotary Valves
back of the GC if installed correctly. This is the ON position.
Tighten the two screws with a Torx T-10 screwdriver. If this
is the last valve to be installed in the heated zone, make sure
the screws that secure the heater block to the lower valve box
are tight.
Tighten these screws
Figure 5
Installing the valve
5 Use needle-nosed pliers to move the valve rotor index pin of
the valve counterclockwise until the pin touches the valve
stop (OFF position).
Valve rotor index pin
Valve stop OFF position
Figure 6
Installing Rotary Valves
Index pin and stops
5
Installing Rotary Valves
6 Use the tubing and fittings in the hardware installation kit to
plumb the valves. See “Common valve configurations" on
page 11.
Reinstall the upper valve box
1 Verify that all valve rotors are in the full counterclockwise
position.
2 For each actuator, loosen the link arm lockscrew in the barrel
of the shaft that links the valve and actuator about 1/4 turn.
You may have to apply significant pressure.
Hex key wrench
Figure 7
Loosening the lockscrew
3 For each actuator, use a flat blade screwdriver to turn the
actuator coupling/shaft assembly counterclockwise until
snug.
Turn counterclockwise
Figure 8
6
Setting the coupling shaft
Installing Rotary Valves
Installing Rotary Valves
4 Locate the two half–moon cutouts at the bottom back of the
upper valve box. Place the upper box on top of the lower
valve assembly, routing the heater/sensor wires through the
cutouts. Secure with two T-20 Torx screws.
5 For each actuator, push the coupling/shaft assembly
downward with a flat blade screwdriver until the slot on the
coupling engages the valve rotor index pin.
If the coupling and valve do not engage, check that both are
fully counterclockwise and try again. If necessary, turn the
shaft slightly to engage the coupling.
6 Continue to turn the shaft counterclockwise until snug, to
ensure that the valve and actuator are both in the OFF
position.
Turn counterclockwise
Figure 9
Turning the valve OFF
7 Tighten the link arm lockscrew firmly.
Installing Rotary Valves
7
Installing Rotary Valves
Installing a valve on a side mount bracket
WA RN ING
The oven, inlet, and detector may be very hot. Before proceeding,
turn off the oven and all other heated zones and let them cool down.
Harmful gases may be present. Hydrogen (if used) can present an
explosion hazard. Before proceeding, turn off all supply gases at
their sources.
Shock hazard. Before proceeding, turn off the GC and disconnect the
power cord.
1 Secure the clamp ring to the side mount bracket with two
Torx T-20 screws.
Actuator
Mounting screws
Set screw
Clamp ring
Valve
Side mount bracket
Figure 10
8
Attaching the clamp ring
Installing Rotary Valves
Installing Rotary Valves
2 With a flat blade screwdriver, turn the actuator
coupling/shaft assembly counterclockwise until snug.
Turn counterclockwise
Figure 11
Setting the coupling shaft
3 Use needle–nosed pliers to move the valve rotor index pin of
the valve counterclockwise until the pin touches the valve
stop (Off position).
Valve rotor index pin
Valve stop OFF position
Figure 12
Index pin and stops
4 Use the tubing and fittings in the hardware installation kit to
plumb the valves. See “Common valve configurations" on
page 11.
5 Loosen the clamp ring set screw and insert the valve through
the clamp ring and the bracket. Orient the valve so that the
valve rotor index pin mates with the actuator. Tighten the
clamp ring set screw.
Installing Rotary Valves
9
Installing Rotary Valves
Restoring the GC to operating condition
1 If the electronics side or top cover was removed to install an
actuator and solenoid, reinstall it now.
2 Plug in the power cord and turn on the GC.
3 Configure the valves. See your GC Operating Manual if you
need help.
4 Connect the solenoid air line to a source of clean, dry air at
55 psi.
If your detector also uses air, pulses in a shared air line may
affect it. The solenoid air supply should be separate from the
detector air supply.
5 Turn on the air supply to the solenoid valves.
6 Use a flat blade screwdriver to turn each installed valve ON
and OFF. Ensure that each valve is physically in the OFF
position as described on page 5.
7 Use the 3 mm hex key wrench to tighten the link arm
lockscrew by rotating it clockwise until very tight.
Hex key wrench
Figure 13
Tightening the link arm lockscrew
8 If it was removed, reinstall the detector cover.
10
Installing Rotary Valves
Installing Rotary Valves
Common valve configurations
1 The next several pages show some commonly used valve
configurations.
Arrows indicate the
direction of flow.
Adjustable Restrictor valves
are used to adjust the pressure
drop (e.g., to balance flow)
Fixed (non-adjustable) restrictors
Loops have a
specified volume
Union
Fitting
Jumper volume is
not specified.
Figure 14
Installing Rotary Valves
Column
Legend
11
Installing Rotary Valves
Valve plumbing tips
• Use bulkhead fittings with attached tubing for column
connections. Mount the fitting, pointing down, on the left or
right nut plate and secure with a retaining nut. Connect the
free end of the tubing to the valve.
• The best way to cut narrow tubing is with a tubing cutter
designed for this task. If some other cutter is used, check:
• The tubing bore is not restricted at the cut end
• The cut is at right angles to the tubing
• There are no burrs that might interfere with connections.
• Avoid kinks in the tubing.
Column
or
2nd Valve
Carrier
Loop
In
Sample
Out
12
OFF
(Load)
Gas sampling valve
ON
(Inject)
Installing Rotary Valves
Installing Rotary Valves
Column 2
Column 2
Column 1
Column 1
Carrier
Detector
or valve
Adjustable restrictor valve
ON
OFF
Column isolation*
*Temperature limited to 235 °C by micrometering needle valves
to GSV
Sample in
Stream 1 ln
Vent
Stream 2 ln
OFF
ON
Two stream selection (requires gas sampling)
Installing Rotary Valves
13
Installing Rotary Valves
Column
Carrier
Detector
ON
OFF
Backflush to detector
Precolumn
1st Carrier
Vent
2nd Carrier
Column
Detector
OFF
ON
Backflush a precolumn to vent
14
Installing Rotary Valves
Installing Rotary Valves
Column 1
From flow controller,
Inj. Port or GSV
Column 2
OFF
ON
Column selection (unused column isolated)
Column 1
Carrier
Carrier
Detector
Column 2
OFF
ON
Sequence reverse
Installing Rotary Valves
15
Installing Rotary Valves
Column 1
Carrier
Detector
Column 2
OFF
ON
Sequence reverse with backflush of column 1
16
Installing Rotary Valves
Installing Rotary Valves
Column
Detector
or 2nd Valve
Precolumn
1st Carrier
Out
Sample
Vent
In
Loop
2nd Carrier
ON
OFF
Gas sampling with backflush of precolumn to vent
Installing Rotary Valves
17
Installing Rotary Valves
Column
Carrier
Detector
or 2nd
valve
Out
Sample
In
Loop
OFF
ON
Gas sampling with backflush to detector
Out
Sample 2
In
Loop 2
Carrier
Out
Sample 1
In
Detector
or 2nd Valve
Loop 1
ON
OFF
Gas sampling of alternate streams
18
Installing Rotary Valves
Installing Rotary Valves
Column 2
Carrier
Out
Sample
In
Loop
Column 1
ON
OFF
Gas sampling with sequence reverse
Column 2
Carrier
Out
Sample
In
Detector
or
2nd valve
Column 1
Gas sampling with sequence reverse and backflush of column 1
Installing Rotary Valves
19
Installing Rotary Valves
Column 2
Carrier 1
Vent
Carrier 2
Column 1
OFF
Detector or
2nd Valve
ON
Column selection with backflush to vent
Carrier
OFF
ON
Liquid sampling
20
Installing Rotary Valves
Installing Rotary Valves
Column 1
Column 2
Carrier
Detector
Loop
In
Sample Out
Adjustable Restrictor valve
OFF
OFF
Gas sample and column isolation
Column 1
Column 2
Carrier
Out
Sample
In
Detector
Loop
OFF
OFF
Adjustable Restrictor valve
Gas sample/backflush and column isolation
Installing Rotary Valves
21
Agilent Technologies
Printed on recycled paper.
This product is recyclable.
Agilent Technologies, Inc.
Printed in USA, April 2002
G2739-90107

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