Flowserve Valtek Spring Cylinder Rotary Actuators User Manual
Flow Control Division
Installation, Operation, Maintenance Instructions
Valtek Spring Cylinder
Rotary Actuators
GENERAL INFORMATION
The following instructions are designed to assist in
unpacking, installing and performing maintenance as
required on Valtek® Spring Cylinder Rotary Actuators.
Product users and maintenance personnel should
thoroughly review this bulletin prior to installing, operating or performing any maintenance on the actuator.
Separate maintenance instructions cover additional
components (such as Valdisk and ShearStream body
assemblies, fail-safe systems, limit switches, hand-levers,
position transmitters and handwheels.
This publication does not contain information on
Flowserve positioners. Refer to the appropriate maintenance bulletin for installing, calibrating, maintaining,
troubleshooting and operating Flowserve positioners.
This bulletin contains instructions on maintaining the
clamping and non-clamping splined lever design.
Contact the factory or your Flowserve representative for
more information on the diaphragm seal assembly design.
To avoid possible injury to personnel or
damage to valve parts, WARNING and CAUTION
notes must be strictly followed. Modifying this
product, substituting non-factory parts, or
using maintenance procedures other than
outlined could void warranties, drastically
affect performance and be hazardous to
personnel and equipment.
IMPORTANT
Three designs of the Spring Cylinder Rotary Actuator
exist in service today. The original design contained a
diaphragm seal assembly in the actuator. This assembly
was later replaced with a sliding seal assembly. Lifecycle testing under rigorous conditions shows sliding
seals will last many times longer than diaphragm stem
seals. Made of Delrin 100 and bronze, sliding seals are
durable and much easier to maintain. Since the sliding
seal design has replaced the diaphragm as Flowserve’s
standard, it is highly recommended that the diaphragm
stem seal be replaced with the sliding seal.
The third design uses a standard rotary actuator with
a sliding seal assembly in the actuator and a clamping
lever arm in the transfer case.
Maintenance personnel should become familiar with
the particular rotary actuator design needing service
and follow the appropriate maintenance instructions for
that design.
Unpacking
1. While unpacking the actuator, check the packing
list against the materials received.
2. When lifting the actuator from the shipping container,
position lifting straps and hoist to avoid damage to
tubing and mounted accessories.
WARNING: When lifting an actuator with lifting
straps, be aware the center of gravity may be
above the lifting point. Therefore, support must
be given to prevent the actuator from rotating.
Failure to do so can cause serious injury to
personnel and damage to actuator or nearby
equipment.
3. Contact your shipper immediately for any shipping
damage.
4. Contact your Flowserve representative for any
problems.
Installation
Prior to installation, make sure adequate overhead and
side clearance for the actuator is provided to allow for
proper removal and for proper maintenance. Refer to
Table I.
NOTE: If the actuator is attached to a Valtek Valdisk or
ShearStream valve body assembly, see Installation,
Operation, Maintenance Instructions 10 or 27 for
overhead clearances.
Table I: Overhead Clearance for
Disassembly
Actuator Size Minimum Clearance
25 6 inches
50 8 inches
00, 200 9 inches
NOTE: Although Valtek rotary spring cylinder actuators
can be mounted in any position, mounting the cylinder
vertically is the preferred installation.
1. Mount the actuator on the desired valve or other
mechanical device.
2. Connect the air supply and instrument signal air
lines to the two appropriately marked connections
on the positioner. Since both the cylinder and
positioner are suitable for 150 psi air supply, an air
regulator should not be used unless the air supply
exceeds 150 psi.
CAUTION: In some cases, the air supply must
be limited to less than 150 psi. A sticker found
near the upper air port on the actuator cylinder
will indicate this condition.
CAUTION: The transfer case cover plate and
yoke must be mounted on the actuator prior to
it being stroked, otherwise damage will result.
On older designs, the actuator must also be
attached to a valve or other mechanical device.
3. The installation of an air lter on the supply line is
recommended.
4. Make sure all air connections are free of leaks,
using a soap solution.
If an internal problem is suspected with the actuator, refer
to the “Disassembly and Reassembly” section.
1. Examine the actuator for damage caused by
corrosive fumes and process splatter.
2. Clean actuator and repaint oxidized areas.
3. If possible, stroke actuator and check for smooth,
full-stroke operation.
4. Remove the transfer case cover plate and make
sure the positioner linkage and splined lever arm
are securely fastened.
CAUTION: Never apply air to the actuator
without the cover plate installed; otherwise, the
unsupported shaft will sustain damage. Do not
remove the cover plate with the valve in service.
5. Be sure all accessories, brackets and bolting are
securely fastened.
6. If possible, remove air supply and observe the
position indicator plate for correct fail-safe action.
7. Spray a soap solution around the cylinder retaining
ring and the adjusting screw to check for air leaks
through the O-rings.
8. Clean any dir t or other foreign material from the shaft.
9. If an air lter is supplied, check and replace cartridge
if necessary.
Removing Rotary Actuators From
Valtek Valve Bodies
1. Support actuator assembly before disconnecting
it from the body assembly.
2. Remove the actuator cover bolts. Carefully pry or
slide cover plate from the lever arm.
3. On Flowserve actuators with a clamping lever arm
design, loosen the clamp bolt.
4. Loosen the actuator adjusting screw to release
spring pressure.
5. Remove the actuator from the body by separating
the actuator at the yoke. This is done by removing
the four transfer case bolts and pulling the actuator
off the valve shaft.
PREVENTIVE MAINTENANCE
At least once every six months, check for proper operation by following the preventive maintenance steps
outlined below. These steps can be performed while
the actuator is in service and, in some cases, without
interrupting service.
WARNING: Keep hands, hair and clothing away from
all moving parts while operating the actuator. Failure
to do so can cause serious injury.
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ACTUATOR DISASSEMBLY
Disassembling Actuators with clamping and Nonclamping Lever Arm
If it is necessary to disassemble an actuator with a
non-clamping lever arm, refer to Figures 1 and 2, and
proceed as follows:
1. Depressurize actuator and disconnect all tubing.
2. Relieve the spring compression by removing the
adjusting screw.
Adjusting Screw Gasket
(Item No. 248)
Adjusting Screw
(Item No. 210)
Cylinder
(Item No. 202)
Spring
(Item No. 229)
Piston Stem O-ring
(Item No. 272)
Piston
(Item No. 225)
Piston Back-up Ring
(Item No. 269)
Piston O-ring
(Item No. 271)
Cylinder O-ring
(Item No. 274)
Cylinder Retaining Ring
(Item No. 256)
Spring Button
(Item No. 227)
Actuator Stem Locknut
(Item No. 348)
Actuator Stem O-Ring
(Item No. 275)
Sliding Seal Collar
(Item No. 366)
Base Slider O-Ring
(Item No. 278)
Valve Shaft
(Item No. 51)
Transfer Case
(Item No. 204)
Spiral Retaining Ring
(Item No. 368)
Retaining Washer
(Item No. 360)
Actuator Stem
(Item No. 211)
Splined Lever Arm
(Item No. 249)
Yoke/Cover Plate Bearing
(Item No. 258)
Lever Arm Bearing
(Item No. 358)
Pivot Pin
(Item No. 361)
Stroke Stop Jam Nut
(Item No. 347)
Figure 1: Sectional View of Actuator with Non-clamping Lever Arm
Note : Item numbers correspond directly to the bill of material; refer to it for specic part numbers.
Beta Positioner
(Item No. 280)
Stroke Stop Bolt
(Item No. 330)
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