Flowserve Tandem Rotary Actuators User Manual
Tandem Rotary Actuators
GENERAL INFORMATION
The following instructions are designed to assist in
unpacking, installing and performing maintenance as
required on Valtek¨ tandem rotary actuators. Product
users and maintenance personnel should thoroughly
review this bulletin along with Installation, Operation,
Maintenance Instructions 10, Valdisk¨ Control Valves,
prior to installing, operating or performing any maintenance on the actuator. (additional features such as
handwheels, limit switches, fail-safe systems, etc).
This publication does not contain information on Valtek
positioners. Refer to the appropriate Installation, Operation, Maintenance Instructions for installing, maintaining, troubleshooting, calibrating, and operating these
accessaries.
To avoid possible injury to personnel or damage
to valve parts, WARNING and CAUTION notes
must be strictly adhered to. Modifying this product, substituting non-factory of inferior parts, or
using maintenance procedures other than outlined could drastically affect performance and be
hazardous to personnel and equipment.
Spare Parts
Valtek international recommends quality, factory-built
parts be used when servicing Valtek valves. In the USA
phone 1 800 99 SPARE for spare parts information.
Unpacking
Before unpacking the actuator, check the packing list
against the materials received. Lists describing the
actuator and accessories are included in each shipping
container.
1. When lifting the actuator from the shipping container,
position lifting straps to avoid damage to tubing and
mounted accessories. With tandem rotary actuators,
do not attach a lifting ring; instead, use lifting straps
through the yoke legs.
WARNING: When lifting the actuator with lifting
straps, be aware that the center of gravity may
not be at the lifting point. Therefore, support
must be given to prevent the actuator from rotat
ing. Failure to do so can cause serious injury to
personnel or damage to nearby equipment.
2. In the event of shipping damage, contact your shipper immediately.
3. Should any problem arise, contact your Valtek representative.
Installation
Prior to installation, make sure adequate overhead and
side clearance is provided to allow for proper removal
and maintenance of the actuator.
1. Connect air supply and instrument signal. Both connections are marked for the respective positioner
port. Since both cylinder and positioner are suitable
for 150 psi air supply, an air regulator is not required
unless the supply pressure exceeds 150 psi.
NOTE: In some cases, the air supply must be limited
to less than 150 psi. In this case, a sticker near the
upper cylinder air supply connection will indicate the
maximum pressure and an air regulator should be
installed to ensure the supply pressure does not
exceed this value.
2. Use the actuator to close the rotary valve tightly in
the seat before installing between the line flanges.
Do not allow actuator to open the valve until it is
properly bolted between the line flanges (see Maintenance Instructions 10).
CAUTION: Failure to do so may cause seat
misalignment and damage to the seat.
3. Installation of an air filter on the supply line is recommended.
4. Using a soap solution, make sure all air connections
are free of leaks.
5. Be sure mounting box is sealed on all possible
locations.
PREVENTATIVE MAINTENANCE
At least once every six months, check for proper operation by following the preventative maintenance steps
outlined below. These steps can be performed while the
actuator is in service and, in some cases, without
interrupting service. If an internal problem is suspected
with the actuator, refer to the ÒDisassembly and Reas-
-
semblyÓ section.
Rev. 5/89/5M/B Valtek No. 49064
May 1989
1
1.
Examine the actuator for damage caused by corro-
sive fumes and process drippings.
2.
Clean the actuator and repaint areas of oxidation.
3.
If possible, operate the actuator and check for fullstroke operation. Observe the disc position indicator 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.
4.
After depressurizing the line and disconnecting the
air supply, remove the transfer case cover plate and
make sure the lever arm is securely fastened to the
shaft. The positioner follower arm should be correctly 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
fastened.
Sectioned View (Front)
Full Open or Closed
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
Figure 1: 4-inch Stroke Tandem Actuator
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
Sectioned View (Side)
Mid-Stroke
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)
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