Dwyer LIN-E-AIRE® - Manual (Page 7)

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3.2 Adjusting Actuator Range
Note: When using this procedure, be sure that the valve is oper-
ating under normal line pressure conditions.
3.2.1 Air-to-Lower Actuator
1. Slowly increase input pressure until stem just begins to move.
Stem motion can be accurately detected by feeling stem or push
rod as pressure is applied.
WARNING: If valve is used for steam service or where line
process is hot, use visual means of detecting movement to avoid
injury.
2. Note input pressure at which stem moves.
3. If input pressure is not the same as lower range value on data
plate, spring adjusting screw must be adjusted.
If pressure is high, turn adjusting screw, Figure 6, counter-
clockwise as viewed from the valve top.
If pressure is low, turn adjusting screw clockwise as viewed
from the valve top.
4. Release input pressure and repeat Steps 1, 2 and 3 until stem
moves at the lower range value.
3.2.2 Air-to-Raise Actuator
1. Loosen the four set screws on travel stop collar, Figure 6, col-
lar should move freely on push rod.
2. Slowly increase input pressure until stem just begins to move.
Stem motion can be accurately detected by feeling stem or push
rod as pressure is applied.
WARNING: If valve is used for steam service or where line
process is hot, use visual means of detecting movement to avoid
injury.
3. Note input pressure at which stem moves.
4. If input pressure is not the same as lower range value on data
plate, spring adjusting screw must be adjusted.
If pressure is high, turn adjusting screw clockwise as viewed
from the valve top.
If pressure is low, turn adjusting screw counterclockwise as
viewed from the valve top.
5. Release input pressure and repeat Steps 2, 3 and 4 until valve
stem moves at lower range value.
6. Apply the upper range value input pressure stamped on data
plate. Slide travel stop collar up on push rod right to yoke and
tighten the four set screws.
Figure 6. Adjusting Actuator Range
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