Flowserve Valtek Spring Cylinder Rotary Actuators - Manual (Page 2)

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 filter on the supply line is
recommended.
4. Make sure all air connections are free of leaks,
using a soap solution.
PREVENTIVE MAINTENANCE
At least once every six months, check for proper op-
eration 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.
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 dirt or other foreign material from the shaft.
9. If an air filter 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.
ACTUATOR DISASSEMBLY
Disassembling Actuators with clamping and Non-
clamping 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.
2