Smart Positioner
YT-3700 / 3750
Product Manual
Ver. 1.03
25
7. Check the valve stroke. The stroke numbers are engraved on the feedback lever of the
positioner. Position the connection bar at the number on the feedback lever which corresponds
with the desired valve stroke. To adjust, move the bracket, the connection bar or both.
※
The effective linear lever angle is 60 degree.
Stroke : 75mm
Stroke : 45mm
Fig. 3-7: Feedback lever and location of the connection bar
8. After installing the positioner, operate the valve from 0% to 100% stroke by using direct air to the
actuator. On both 0% and 100%, the feedback lever should not touch the lever stopper, which is
located on the backside of the positioner. If the feedback lever touches the stopper, the
positioner should be installed further away from center of the actuator.
Fig. 3-8: Feedback lever should not touch lever stopper on 0% ~ 100% valve stroke.
9. After the installation, tighten all of the bolts on the bracket and the connection bar.
