Valtek VL Spring Cylinder Linear Actuators
USER INSTRUCTIONS
Valtek Control Products
Spring Cylinder Linear Actuators
FCD VLENIM0002-00-AQ - 10/14 (Replaces VLAIM002)
Installation
Operation
Maintenance
Experience In Motion
Valtek Spring Cylinder Linear Actuators FCD VLENIM002-00-AQ 10/14
GENERAL INFORMATION
The following instructions are designed to assist in installing,
troubleshooting and servicing Valtek spring cylinder actuators. Product
users and maintenance personnel should thoroughly review this
bulletin prior to installing, operating or disassembling the actuator.
Separate installation, operation and maintenance instructions cover
additional features (such as hand-wheels, limit stops, fail-safe systems
or limit switches).
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 dam-age 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
a
followed when working on this or any process control product.
Specifically, personal protection and lifting devices must be
used as warranted.
NOTE: If the actuator is attached to a valve body assembly,
see Installation, Operation, Maintenance Instructions 1 for
overhead clearances.
Table 1: Overhead Clearance for Disassembly
Actuator Size Minimum Clearance
25 6 inches
50 8 inches
100,200,300 400,500,600 9 inches
1. 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 supply exceeds 150 psi.
NOTE: In some cases, air supply must be limited to 100 psi
rather than 150 psi; 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
a
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
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
a
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 for any problems.
Installation
2
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 1.
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 “Disassembly and Reassembly” section.
1. Examine the actuator for damage caused by corrosive fumes and
process drippings.
2. Clean the actuator and repaint any areas of severe oxidation.
3. If possible, stroke the actuator and check for smooth, full-stroke
operation.
WARNING: To avoid serious injury, keep hands, hair and
a
clothing away from all moving parts while operating the
actuator.
4. Make sure positioner mounting bolts, linkage and stem clamp are
securely fastened.
5. Ensure all accessories, brackets and associated bolting are securely
fastened.
6. If possible, remove air supply and observe actuator for correct
fail-safe action.
7. Check rubber bellows for wear.
Valtek Spring Cylinder Linear Actuators FCD VLENIM002-00-AQ 10/14
Adjusting Screw Gasket
(Item No. 248 )
Spring Button
(Item No. 227 )
Actuator Stem Locknut
(Item No. 348 )
Piston Stem O-ring
(Item No. 272 )
Piston
(Item No. 225 )
Upper Stem Bushing
(Item No. 253 )
Actuator Stem O-ring
(Item No. 275 )
Lower Stem Bushing
(Item No. 254 )
Stem Clamp Bolting
(Item No. 240/345 )
Stem Clamp
(Item No. 249 )
O
S
Adjusting Screw
(Item No. 210)
Cylinder
(Item No. 202)
Spring
(Item No. 229)
Stem Spacer
(Item No. 223)
Piston O-ring
(Item No. 271)
Yoke O-ring
(Item No. 274)
Cylinder Retaining
Ring
(Item No. 256)
Actuator Stem
(Item No. 211)
Stem Bellows
(Item No. 247)
Stroke Plate
(Item No. 213)
Yoke
(Item No. 201)
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
8. Spray soap solution around the cylinder retaining ring, 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, check and replace cartridge as necessary.
DISASSEMBLY AND REASSEMBLY
Disassembling the Actuator
Refer to Figures 1 through 5 to disassemble the cylinder actuator.
1. Shut off air supply. If the actuator is installed on a Valtek valve,
remove the actuator per Installation Operation and Maintenance
Instructions 1. If installed on other valves, remove the yoke to
bonnet connections, loosen stem clamp bolt and turn actuator
off of plug stem threads.
WARNING: To avoid serious injury, depressurize the line to
a
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 completely by removing the adjusting
screw. Remove adjusting screw gasket from adjusting screw.
CAUTION: Do not use a screwdriver or bar to turn the adjusting
a
screw; instead, use a wrench on the flats of the screw.
WARNING: To avoid serious personal injury, relieve the spring
a
compression before further disassembly. The cylinder could
possibly fly off the yoke when removing the cylinder retaining
ring.
4. Remove the cylinder retaining ring from the groove at the base of
the cylinder by using two screw¬drivers. Insert one screwdriver
in slot found in the ring and pry the ring from the groove. Use the
other screwdriver to help work the ring out of the cylinder groove.
5. Pull the cylinder off the yoke and piston; some O-ring resistance
may be felt.
WARNING: To avoid serious personal injury, do not use air
a
pressure to remove the cylinder. The cylinder could possibly fly
off the yoke.
6. For heavy-duty spring designs using a spring cap (see Figure 4),
remove the spring cap and cap O-ring from the cylinder.
7. For air-to-extend configurations, slowly loosen and remove the
actuator stem locknut. Be certain the piston follows the stem
locknut up the actuator stem and does not bind on the actuator
stem. Remove the actuator stem
3
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