Thermo Scientific SOLA II Flare, User Manual

Page: 133 / 164

Appendix B
Rotary Valve Service
9. Apply air pressure to the actuator inlet nearest the valve so that the
actuator is in the same position as it was when the valve was removed.
10. Slide the valve with its standoff into the clamp ring, making sure that
the square hole in the valve coupling or in the end of the standoff drive
shaft is fully engaged by the square of the actuator drive shaft. Tighten
the clamp ring screw.
Valve Alignment Valves installed using two 3-way solenoids or a Valco Digital Valve.
Interface do not maintain actuation force after they have been actuated. For
accurate valve alignment, a temporary method of supplying continuous air
pressure to the selected actuator inlet must be contrived. Follow the instructions
below.
1. Switch the actuator from one position to the other several times to
make sure that the play in the coupling mechanism has been absorbed.
2. Visually inspect the valve body cutout to determine if the rotor pin is
against the stop. If so, proceed to step 3. If not, skip to step 4.
3. Switch the actuator to its other position and repeat the visual
inspection. If the rotor pin is touching the stop in this position also, the
valve and actuator are properly aligned. If the pin does not touch the
stop, proceed with step 4.
4. Switch the actuator to the other position.
5. Slowly loosen the clamp ring screw until the valve body moves,
indicating that the actuator has traveled to the end of its stroke.
Immediately retighten the clamp ring screw.
6. Repeat the visual inspection. If the steps have been executed correctly,
the rotor pin should contact the stops in both positions. If it does not,
repeat the entire procedure.
Thermo Scientific SOLA II Flare User Manual B-11