Thermo Scientific SOLA II Flare, User Manual

Page: 127 / 164

Appendix B
Rotary Valve Service
Cleaning the Rotor 1. Carefully grasp the rotor on either end and briefly immerse it in solvent.
If it is difficult to grip the rotor securely, hemostats or needle- nosed
pliers may be helpful. Grip the tab end, being careful not to mar the
metal or touch the polymer.
2. Gently wipe the polymer with a clean tissue.
3. Blow with clean compressed gas to remove any lint left by the tissue.
4. Visually inspect the rotor. If it shows any scratches and/or a narrowing
of the flow passages, replacement is necessary.
Rotor Assembly 1. Place the clean rotor on the pencil magnet and orient it so that the tab
properly engages the slot of the drive mechanism. The list in Figure B–3
shows how to orient the ID letter for different VICI valves (A C6W is
shown in Figure B–4).
2. Insert the rotor into the valve body, being careful that the tab does not
touch the polished interior of the valve body. Make sure the rotor tab
(Figure B–4) is fully inserted into the slot in the driver.
3. Using a pencil or other small pointed object, hold the rotor in place in
the valve body while pulling the magnet free.
4. Replace the knurled preload assembly, tightening it into the valve body
by hand just beyond the point where it touches the rotor. Cycle the
valve 10 times to seat the sealing surfaces, leaving the valve fully in its
clockwise or counterclockwise position.
5. Tighten the preload in quarter-turn increments, cycling the valve 10
times after each step. The preload must end up fully bottomed-out, but
attempts to further tighten do not affect the sealing forces.
Note
Make certain that the valve is never left partially actuated. It should always
be in either its fully clockwise or fully counterclockwise position.
▲
Thermo Scientific SOLA II Flare User Manual B-5