Flowserve Tandem Rotary Actuators - Manual (Page 2)

1.
2.
3.
4.
Examine the actuator for damage caused by corro-
sive fumes and process drippings.
Clean the actuator and repaint areas of oxidation.
If possible, operate the actuator and check for full-
stroke operation. Observe the disc position indica-
tor plate mounted on the transfer case: The disc
position indicator should change position in a
smooth, rotary fashion.
Unsteady movement of
the indicator suggests a possible internal valve or
actuator problem.
After depressurizing the line and disconnecting the
make sure the lever arm is securely fastened to the
shaft. The positioner follower arm should be cor-
rectly linked to the follower pin on the lever arm.
cover plate removed.
cover plate before operating the actuator will
cause damage to the shaft, since the cover plate
houses a shaft support bearing.
5. Replace transfer case cover plate and be sure all
mounted accessories (including the positioner),
brackets, and associated bolting are securely
air supply, remove the transfer case cover plate and
fastened.
Sectioned View (Front)
Sectioned View (Side)
Full Open or Closed Figure 1: 4-inch Stroke Tandem Actuator
Mid-Stroke
Parts List
107. Body bolt
201. Yoke plate
202. Cylinder
204. Transfer case
210. Adjusting screw
211. Actuator stem
213. Stroke plate
216. Indicator plate
225. Piston
227. Spring button
229. Spring
238. Follower pin
245. Bearing
246. Yoke bushing
248. Adjusting screw gasket
249. Lever arm
256. Cylinder retaining ring
258. Cover plate bushing
261. Dust cover (not shown)
262. Flange cover (not shown)
271. Piston o-ring
272. Piston stem 0-ring
274. Cylinder O-ring
275. Actuator stem Wing
277. Base seal O-ring
278. Base slider O-ring
280. Positioner
326. Spring guide
330. Stroke stop bolt
334. Yoke plate bolts
336. Cover plate bolts
347. Stroke stop jam nut
348. Actuator stem locknut
358. Rod end bearing
360. Sliding seal top clamp
361. Pivot pin
362. Splined bearing snap-ring
363. Cover plate
364. Rod end
365. Doweled washer
366. Sliding seal collar
367. Base seal
368. Spiral retaining ring
370. Retaining ring
371. Shaft spacer
372. Flat washer
378. Gasket
426. Cotter pin
427. Bolt (not shown)