Travel Stop Adjustment; Double-Acting Actuators - Emerson Bettis Q Series Installation, Operation And Maintenance Manual

Section 5: Mechanical Stroke Adjustment
April 2019
5.1

Travel Stop Adjustment

Do not turn out the travel stops completely when the actuator is pressurized.
When adjusting the travel stops and the actuator is still pressurized, the travel stops can be
"shot" away when completely turned out.
5.1.1

Double-Acting Actuators

1.
2.
3.
Figure 19
Stop 1
4.
5.
6.
7.
8.
26
CAUTION: PRESSURIZED ACTUATOR
Operate valve/actuator assembly to the required "Closed" position.
Remove air supply.
Slacken locknut on the "Closed" stop (2).
Turn the "closed" stop clockwise to reduce or counterclockwise to increase the
travel. Consult Section 5.1.3 (angular displacement of the pinion), to define how
far the limit stop must be turned in or out.
Tighten the lock nut.
Connect air and cycle the actuator to check that the position is correct.
If not repeat from 2.
Remove air supply.
For adjusting the open position repeat steps 1 to 7, but now for the open position
and "Open" stop (1).
Installation, Operation and Maintenance Manual
Stop 2
Stop 1
A-port
B-port
DOC.IOM.BQ.E Rev. 3
Stop 2
Mechanical Stroke Adjustment