● A sample that contains non-volatile or easily polymerized components (salts, proteins,
monomers etc.) can deposit residues in the vaporizer (16), in the injection hole, on the
sample flow unit (15), and on the injection stem (6). Therefore, these parts should be
cleaned regularly if the sample contains materials which are not vaporized.
● The sample flow unit (15) should be oriented vertically when the valve is installed. This is
so that the sample will flow vertically through the valve to prevent air bubbles from forming
in the valve. Make note of this when reinstalling the valve after service.
4.2.2 Liquid Injection Valve Component Locations
1. Control Cylinder
2. Hex Set Screws
3. Control Piston
4. Large O-Rings
5. Guide Pin (Only on Cross-Hole)
6. Injection Stem (tappet)
7. Valve Body
8. Small O-Ring and Piston Guide Hole
9. Label Indicating Injection Volume
10. Belleville Washer Plate Springs (approx. 8)
11. Adjustment Nut
12. Adjustment Counter Nut
13. Adjustment Assembly
14. Gaskets (2)
15. Sample Flow Unit
16. Vaporizer
17. Flange
18. Carrier Gas Inlet Tube
Belleville Washer Orientation
Bevel up
Bevel down
Bevel up
Note: The guide pin (5) is only applicable
to pistons with the “cross-hole” type stem.
Pistons with the much more common
“groove/notch” stem are not equipped
with a guide pin.
Figure 4-6 Liquid Injection Valve Exploded View
Valves
4.2 Liquid Injection Valve
Maxum II Valves and Oven Components
38 Service Manual, 10/2018, A5E42019844001
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