13
YT-3400/3450 series
3.3.2
Installation Steps
1. Please check the actuator’s stem height and adjust the bracket by
referring to the bracket table.
2. Attached the bracket onto the actuator. It is recommended to use spring washer so the
bolts will not be loosen from vibration.
3. Set rotation position of the actuator stem at 0%. For single acting actuator, it is easy to
check 0% point by supplying no pressure to the actuator. For double acting actuator,
check actuator stem’s rotation direction – clockwise or counter-clockwise - by supplying
pressure to the actuator.
4. Install the fork lever after setting actuator’s stem at 0%. Check the actuator stem’s
rotation direction – clockwise or counter-clockwise. Installation angle of the fork lever
should be 45 degrees in relation to the linear shaft. For NAMUR shaft installation, the
angle does not matter.
Fig. 6:
Counter-clockwise and clockwise rotation.
5. After setting fork lever position, assemble lock nuts
which are located on the bottom of the fork lever.
Ensure to set the height of the upper fork lever
between
6~11mm
, which is lower than the upper
bracket’s height.
6. Attach the positioner to the bracket. Fix the
clamping pin on the main shaft’s center of the
positioner and insert connection pin into the fork
lever slot. This will lock to the fork lever spring.
Setting alignment of the main shaft of the positioner
and center of the actuator’s stem is very important.
Poor alignment of the main shaft and the actuator’s
stem decreases the positioner’s durability due to
unnecessary forces on the main shaft.
7. Tighten the positioner and the bracket with hexagon-headed bolts and plate washer
after
checking the positioner’s position.
