16
YT-3400/3450 series
3.3.1
Installation Steps
1. Proper bracket must be made in order to adapt the positioner on the actuator yoke.
Please consider following important points when a bracket is being designed.
Positioner
’s feedback lever must be vertical to the valve stem at 50% of the valve
stroke.
The connection bar of the actuator clamp for the feedback lever should be installed
in such a way that the valve stroke length coincides with the corresponding figure in
“mm” marked on the feedback lever. Improper setting may cause poor linearity and
may create unnecessary hunting during the operation.
2. Assemble the positioner with the bracket made in previous step by fastening the bolts.
Please refer to the backside of the positioner for size of the bolts. The standard bolt
size is M8 x 1.25P. Please contact Young Tech Co., Ltd for other bolt sizes.
Fig. 14: YT-3400/3450L with bracket
Fig. 15: Attaching bracket to actuator yoke
3. Attach the positioner with bracket to the actuator yoke
–
DO NOT TIGHTEN THE
BRACKET COMPLETELY.
4. Connect positioner
’s feedback lever to the connection bar of the actuator clamp. The
hole gap on the feedback lever is 6.5mm. The connection pin
’s outer diameter should
be less than 6mm.
5. Connect supply pressure to the actuator temporarily. Supply enough supply pressure to
the actuator in order to position the actuator clamp at 50% of the total valve stroke.