Flowserve VL-C User Manual
Valtek VL-C Spring Cylinder
Linear Actuators
GENERAL INFORMATION
The following instructions are designed to assist in
installing, troubleshooting and servicing Valtek VL-C
spring cylinder linear actuators sizes 100, 150 and 200.
Separate installation, operation and maintenance
instructions cover 25 and 50 sizes as well as additional
features (such as handwheels, limit stops, fail-safe
systems or limit switches). Product users and maintenance personnel should thoroughly review this bulletin
prior to installing, operating or disassembling the
actuator.
This publication does not contain information on
Flowserve positioners. Refer to the appropriate installation operation and maintenance instructions for installing, maintaining, troubleshooting, calibrating and
operating Flowserve positioners.
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 or inferior
parts or using maintenance procedures other
than outlined could drastically affect performance, void product warranties and be hazardous to personnel and equipment.
WARNING: Standard industry safety practices must
be followed when working on this or any process
control product. Specifically, personal protection
and lifting devices must be used as warranted.
Unpacking
While unpacking the actuator, check packing list against
materials received. Lists describing the actuator and
accessories are included in each shipping container.
1. Position the lifting straps and hoist to avoid damage
to the tubing and mounted accessories when lifting
the actuator from the shipping container.
WARNING: When lifting an actuator with lifting
straps through the yoke legs, be aware the
center of gravity may be above the lifting point.
Therefore, support must be given to prevent the
actuator from rotating or causing serious injury
to personnel or damage to nearby equipment.
2. Contact your shipper immediately in the event of
shipping damage.
3. Contact your Flowserve representative with any
problems.
Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Valtek No. 188485
54-1
Installation
Prior to installation, make sure adequate overhead
clearance for the actuator is provided to allow for proper
removal from the valve body and for proper maintenance. Refer to Table I.
Table I:
Overhead Clearance for Maintenance
Actuator Size Minimum Clearance
100, 150, 200 9 inches
NOTE: If an actuator is attached to a valve body
assembly, see the appropriate installation, operation,
maintenance instructions.
1. Connect the air supply and instrument signal air
lines to the two marked connections on the
positioner. Since both the cylinder and positioner
are suitable for 150 psi (10.3 bar) air supply, an air
regulator should not be used unless the supply
exceeds 150 psi (10.3 bar).
NOTE: In some cases, air supply must be limited to
100 psi (6.9 bar) rather than 150 psi (10.3 bar); this
will be indicated by a sticker found near the upper
air port on the cylinder.
WARNING: To avoid personal injury or equipment damage, do not exceed recommended
supply pressure.
2. Installation of an air filter on the supply line is
recommended.
3. Use a soap solution to make sure all air connections
are leak-free.
MAINTENANCE
At least once every six months, check for proper operation by following the preventative maintenance steps
outlined below.
while the actuator is in service.
suspected with the actuator, refer to the
and Reassembly
WARNING: To avoid serious injury, the following
steps should only be performed with the air supply
or positioner input disconnected.
1. When disconnecting air supply, observe actuator
for correct fail-safe action.
2. Examine the actuator for damage caused by corrosive fumes and process drippings.
3. Clean the actuator and repaint any areas of severe
oxidation.
4. If possible, stroke the actuator and check for
smooth, full-stroke operation.
WARNING: To avoid serious injury, keep hands,
hair and clothing away from all moving parts
while operating the actuator.
These steps should not be performed
If an internal problem is
Disassembly
section.
5. Make sure positioner mounting bolts, linkage and
stem clamp are fastened securely.
6. Ensure all accessories, brackets and associated
bolting are fastened securely.
7. Check rubber bellows for wear.
8. Spray soap solution around the base and top of the
cylinder, the adjusting screw and the lower actuator
stem bushing to check for air leaks through the
O-rings and gasket.
9. Clean any dirt or foreign material from the actuator
stem.
10. If an air filter is supplied, isolate the air filter, then
check and replace cartridge as necessary.
DISASSEMBLY AND REASSEMBLY
Disassembling the Actuator
Refer to Figures 1 through 4 to disassemble the cylinder
actuator.
1. Shut off air supply. If actuator is installed on a
Flowserve valve, remove the valve per the appropriate installation operation, maintenance instructions.
WARNING: To avoid serious injury, depressurize the line to atmospheric pressure and drain
all fluids before working on the actuator.
2. Disconnect all tubing. Remove stem clamp and
stem bellows from the actuator stem.
3. Relieve spring compression by completely removing the adjusting screw. Remove adjusting screw
gasket from adjusting screw.
WARNING: To avoid serious personal injury,
relieve the spring compression before further
disassembly. The cylinder end cap may fly off
the yoke when removing the cylinder tie-rod
nuts.
4. Remove the four self-locking tie rod nuts by unscrewing in an alternating pattern. Remove the
cylinder end cap.
5. Lift the cylinder off the yoke and piston. If excessive
O-ring resistance is felt, use a rubber mallet to
gently tap around the cylinder perimeter.
WARNING: To avoid serious personal injury, do
not use air pressure to remove the cylinder. The
cylinder may fly off the yoke.
CAUTION: When removing the actuator stem
lock nut, do not hold the actuator stem with a
pipe wrench as the sealing surface may be
damaged; instead, use a wrench on the flats of
the actuator stem.
6. For air-to-retract configurations, remove the
spring(s) and spring button for cleaning and inspection (see Figures 1, 3 and 4). Remove the actuator
54-2
Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Tie Rod Nut (4)
(Item No. 205)
End Cap
(Item No. 207)
Tie Rod (4)
(Item No. 206)
Actuator Stem
Lock Nut
(Item No. 348)
Adjusting Screw
(Item No. 210)
Adjusting Screw
Gasket
(Item No. 248)
End Cap O-ring
(Item No. 227)
Spring Button
(Item No. 227)
Spring
(Item No. 229)
Stem Spacer
(Item No. 228)
Cylinder
(Item No. 202)
Yoke O-ring
(Item No. 271)
Piston Stem
O-ring
(Item No. 272)
Stem Bellows
(Item No. 247)
Yoke
(Item No. 201)
Quad-seal
(Item No. 271)
Piston
(Item No. 225)
Actuator Stem
(Item No. 211)
Bushing
(Item No. 253)
Actuator Stem
O-ring
(Item No. 275)
Bushing
(Item No. 253)
Stem Clamp
No. 26906
(Valtek Positioner)
Figure 1: Air-to-retract Cylinder Actuator
NOTE: Item numbers correspond directly to actuator's bill of material. Refer to it for specific part numbers.
stem locknut by holding the flats on the actuator
stem and slide the piston and stem spacer off the
actuator stem. The spring guide should be removed
when using dual or heavy-duty spring designs.
NOTE: The dual spring configuration (Figure 3) has
two springs, one inside the other. Remove both
springs during this step.
7. For air-to-extend configurations, slowly loosen and
remove the actuator stem locknut and piston.
Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
(Remove the piston and stem locknut together,
making sure the piston does not bind on the actuator stem.) Next, remove the spring button, spring
and stem spacer.
WARNING: To avoid personal injury, be certain
the spring force is completely relieved before
removing actuator stem locknut.
8. Remove the piston quad-seal, piston stem O-ring
and yoke O-ring.
54-3
Loading...