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Model EA91A＆EA90A
Diaphragm Actuator
Crank Box
Elector-pneumatic
Positioner
Shaft
Shaft
Bracket
Spacer Bolt
Set Screw Connecting Pipe
Indicator
Spring Washer
Lock Nut
Connecting
pipe
Hole Position（Vertical）
Connecting Shaft
Set Spring
Set Screw
（Horizontal）
Connecting
Shaft
Feed back Shaft
4.5 Installation to Rotary Motion Actuator
⑴ Attach the spacer bolt.
Tighten the spacer bolt to crank box. (Screw short side of spacer bolt threaded part.)
⑵ Mount the connecting shaft.
Insert the lock nut, spring washer, and indicator to connecting shaft, and screw the connecting shaft to M8
screw of valve shaft.
⑶ Fix the indicator.
Check that valve action is air failure-open or air-failure close. Then, fix the indicator to appropriate position,
open or close, on indicator scale with lock nut.
※The hole position of set spring must be vertical to connecting shaft.
⑷ Attach the bracket.
Attach the bracket to the preinstalled spacer bolt.
⑸ Attach the connecting pipe.
Attach the connecting pipe to the serrated portion of the feedback shaft at back side of the positioner with
set screw.
※The position of the set screw must be horizontal.
⑹ Mount the positioner.
Insert the connecting shaft to the connecting pipe and mount the positioner to spacer bolt.
⑺ Attach set spring.
Attach the set spring to the connecting pipe and connecting shaft.
IMPORTANT
Set the inserting hole on connecting shaft vertically and the set screw on connecting rod
horizontally to proper position.
IMPORTANT
Check the positioner and connecting shaft the connecting pipe and the feedback shaft are
fixed in alignment, when the bracket is tighten.
IMPORTANT
The set spring is the important part to absorb play between connecting shaft and set screw.
Be sure to attach the set spring so that the function is served fully.
⑻ Install air piping. (Refer to Item 5.2)
Positioner Installation Drawing
to Actuator Model 2900
