VICI Two position Standard electric - Manual (Page 14)

5.2 Chromatographic Symptoms of Misalignment
5.21 Loss of Flow or Blocked Flow
When the rotor does not rotate completely or accurately, the ports of the valve may
not intersect the engravings on the valve rotor. This can cause a loss of flow at
outlets or a blockage of flow at inlets.
5.22 Multiple Peaks or Doublets
In some configurations, the engraving may not be aligned properly even though
flow is not eliminated. Some engravings are very small or very large, and
inaccurate alignment can cause what appear to be multiple injections due to the
sweeping action of the rotor.
5.3 Causes of Misalignment
5.31 Removal of the Valve from the Actuator for Mounting
To mount valves through a bracket or oven wall, the valve and standoff assembly
must be separated from the actuator. Any time the clamp ring screw has been
loosened, the alignment of the valve after replacement on the actuator must be
checked, and realigned as necessary.
NOTE: To reduce the possibility of having to realign after installation,
before removing the valve from the actuator:
Closemount: Make temporary registration marks on the face of the valve
where it lines up with the slot in the stainless clamp ring on the actuator.
Standoff: Make temporary registration marks on the standoff tube where it
lines up with the slot in the black anodized clamp ring on the actuator. Do
not remove the valve from the standoff assembly.
When this mark is lined up with the slot on reassembly, the factory alignment
will be approximately reproduced as long as the valve and the actuator re-
main in their original positions.
Whenever the valve and standoff assembly is removed from the actuator and
replaced, be certain that the assembly is inserted into the actuator as far as
possible (approximately 3/8 inch) to achieve complete driver coupling.
5.32 Shock from Heavy or Continuous Use
Occasionally, when valves are used in applications requiring a high-duty cycle,
wear or shock may cause the valve mounting screws or the clamp ring screw to
loosen. This allows the valve to overthrow and may result in misalignment. The
most obvious symptom is movement observed in the valve or valve/standoff
assembly, which normally would not move when the valve is actuated.
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