Flowserve Valtek VL Spring Cylinder Linear Actuators User Manual

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

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

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

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

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

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 )

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

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

screw; instead, use a wrench on the ﬂats of the screw.

WARNING: To avoid serious personal injury, relieve the spring

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

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

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