Smart Positioner
YT-2500 / 2550 / 2501 Series
Product Manual
Ver. 1.34
26
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.
Stroke : 30mm
Stroke : 70mm
Fig. 3-9: Feedback lever and location of the connection bar
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The effective linear lever angle of YT-2500 series is 30 degree.
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. 3-10: 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.
