Flowserve Valtek Mark Guide

1-1
Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Valtek Mark One and
Valtek No. 49011
GENERAL INFORMATION
The following instructions are designed to assist in
unpacking, installing and performing maintenance as
required on Valtek®Mark One and Mark Two control
valves. Product users and maintenance personnel
should thoroughly review this bulletin prior to installing,
operating or performing any maintenance on the valve.
Separate installation, operation, maintenance instruc-
tions cover additional features (such as special trim,
diaphragm actuator, handwheel and extension bonnets).
This publication does not contain information on Valtek
positioners.RefertotheappropriateInstallation,Opera-
tion, Maintenance Instructions for installing, maintain-
ing, troubleshooting, calibrating and operating Valtek
positioners.
To avoid possible injury to personnel or dam-
age to valve parts, WARNING and CAUTION
notesmustbestrictlyfollowed.Modifyingthis
product, substituting non-factory parts or us-
ing maintenance procedures other than out-
lined could drastically affect performance and
behazardous topersonnelandequipmentand
may void existing warranties.
WARNING: Standard industry safety practices
must be adhered to when working on this or any
other process control product. Specifically, per-
sonal protective and lifting devices must be used
as warranted.
NOTE: Selecting the proper fastener material is the
responsibility of the customer. Typically, the supplier
does not know what the valve service conditions or
environment may be. Flowserve's standard body bolt-
ingmaterialisB7/2H.B8(stainlesssteel)isoptionalfor
applications more than 800 ° F / 425 ° C and with
stainless steel or alloy body valves. The customer
therefore must consider the material's resistance to
stress corrosion cracking in addition to general corro-
sion. As with any mechanical equipment, periodic
inspection and maintenance is required. For more
information about fastener materials, contact your
Flowserve representative.
Unpacking
1. While unpacking the valve, check the packing list
against materials received. Lists describing valve
and accessories are in each shipping container.
2. When lifting the valve from shipping container, posi-
tion the lifting straps through the yoke legs to avoid
damage to the tubing and mounted accessories.
WARNING: When lifting an actuator with lifting
straps through the yoke legs, be aware that the
center of gravity may be above the lifting point.
Therefore, support must be given to prevent the
actuatorfromrotating.Failuretodosocancause
serious injury to personnel, damage to the valve
or nearby equipment.
Mark Two Control Valves

1-2 Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Table II: Common Lubricants
Temperature
Range
Krytox 206 E.I. DuPont -5°to 550°F / Fluorinated general purpose grease; handles common
-20°to 285°C liquids and gases; good lubricity in harsh mediums;
nonflammable, chemically inert; will not harm plastic
or metal parts
GP 460 Graphite 32°to 1000°F / Graphite in petrolatum; high pressures; anti-galling,
Products Co. 0°to 540°C graphite remains above 600°F / 316°C
Aeroshell Shell Oil Co. -100°to 300°F / Synthetic oil based; low temperature applications
Grease 7 -75°to 150°C
Garlock Garlock Inc. 32°to 500°F / General purpose molybdenum disulfide lubricant
Luball 0°to 260°C economical; good in water, steam and common
chemicals; not good in harsh mediums where Krytox
206 is recommended
3. Contactyourshipperimmediately ifthereisshipping
damage.
4. Should any problem arise, call your representative.
Installation
1. Before installing the valve, clean the line of dirt,
welding chips, scale or other foreign material.
2. Whenever possible, the valve should be installed in
an upright position. Vertical installation permits
easier valve maintenance. This is also important for
cryogenic applications to keep the packing isolated
from the flowing medium, permitting the packing
temperaturetoremainclosetoambienttemperature.
CAUTION: Do not insulate extension bonnets
that are provided for hot or cold services.
3. Besuretoprovideproperoverheadclearanceforthe
actuatortoallowfordisassemblyoftheplugfromthe
valve body. Refer to Table I for the necessary clear-
ance needed for valve disassembly.
4. Double-check flow direction to be sure the valve is
installed correctly. Flow direction is shown by the
arrow attached to the body flange. Standard air-to-
open valves close on air failure and should be
installed so the flow tends to close the valve, except
in rare circumstances that will be clearly indicated.
Standard air-to-close valves open on air failure and
should be installed with the flow tending to open the
valve.
5. If welding the valve into the line, use extreme care to
avoid excess heat buildup in the valve.
6. If the valve has separable end flanges, the half rings
mustbeinstalledonthevalvebodybeforeboltingthe
valve into the line to ensure a tight connection.
WARNING: Failure to install half rings on the
valve body can cause serious personal injury.
7. Connect air supply and instrument signal (air or mA)
lines. Throttling control valves are equipped with a
valve positioner. Two connections are marked: one
for the air supply and the other for the instrument
signal. Both the actuator and the positioner are
suitable for 150 psi / 10.3 Bar air supply. An air
regulator is not required unless the supply pressure
exceeds 150 psi / 10.3 Bar. An air filter should be
installed before the positioner unless supply air is
clean and dry. All connections must be free of leaks.
CAUTION:Onvalvesequippedwithairfilters,the
air filter must point down to perform properly.
NOTE: In some rare cases, the air supply must be
limited to less than 150 psi / 10.3 Bar. This is indi-
catedonastickerfoundneartheupperairportonthe
actuatorcylinder.Anairregulatorshouldbeinstalled
to ensure the supply pressure does not exceed the
line pressure indicated on the sticker.
Lubricant Manufacturer Description Applications
Table I: Overhead Clearance Requirement
Valve Size Clearance Valve Size Clearance
(inches) (inches) (inches) (inches)
1/2,3/4, 1 3 / 76 6 10 / 254
11/2, 2 5 / 127 8 13 / 330
3 6 / 152 10 14 / 356
4 8 / 203 12 15 / 381

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Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
S
O
E0031
Figure 1: Mark One Control Valve
NOTE: Item numbers correspond directly to the valve's bill of material. Refer to it for specific part numbers.
Seat Retainer
(Item No. 30)
Seat Ring
(Item No. 20)
Seat Ring
Gasket
(Item No. 55)
Body
(Item No. 1)
Half Ring
(Item No. 11)
End Flange
(Item No. 10)
Adjusting Screw
(Item No. 210)
Spring
(Item No. 229)
Piston Stem O-ring
(Item No. 272)
Cylinder
(Item No. 202)
Piston
(Item No. 225)
Piston O-ring
(Item No. 271)
Yoke O-ring
(Item No. 274)
Stem Clamp
(Item No. 249)
Gland Flange
(Item No. 80)
Upper Packing
(Item No. 88)
Yoke Clamp
(Item No. 76)
Packing Spacer(s)
(Item Nos. 94-99)
Bonnet
(Item No. 40)
Bonnet Flange
(Item No. 70)
Anti-Extrusion Spacer
(Item No. 93)
Adjusting Screw Gasket
(Item No. 248)
Spring Button
(Item No. 227)
Actuator Stem Locknut
(Item No. 348)
Actuator Stem Spacer
(Item No. 228)
Actuator Stem Bushing
(Item Nos. 253/254)
Actuator Stem O-ring
(Item No. 275)
Actuator Stem
(Item No. 211)
Cylinder Retaining Ring
(Item No. 256)
Stroke Plate
(item No. 213)
Stem Bellows
(Item No. 247)
Yoke
(Item No. 201)
Upper Stem Guide
(Item No. 87)
Upper Stem Guide Liner
(Item No. 86)
Anti-Extrusion Spacer
(Item No. 93)
Bonnet Flange
Stud and Nut
(Item Nos. 108/114)
Bonnet Gasket
(Item No. 58)
Lower Packing
(Item No. 88)
Lower Stem
Guide
(Item No. 83)
Lower Stem
Guide Liner
(Item No. 82)
Plug
(Item No. 50)

1-4 Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
7. If possible, stroke the valve and check for smooth,
full-stroke operation. Unsteady stem movement
could indicate an internal valve problem.
NOTE: Jerky stem motion is normal whenever
graphite packing is used.
WARNING:Keep hands, hair andclothingaway
fromallmoving partswhenoperatingthevalve.
Failure to do so can cause serious injury.
8. Make sure positioner linkage and stem clamp are
securelyfastened.Ifthestemclampisloose,check
plug thread engagement (refer to the “Reassem-
blingtheActuator”sectionforthecorrectprocedure
on aligning the plug with the seat.)
9. Ensure all accessories, brackets and bolting are
securely fastened.
10. Ifpossible,removeairsupplyandobserveactuator
for correct fail-safe action.
11. Check rubber bellows for wear.
12. Spray a soap solution around the cylinder actuator
retaining ring, adjusting screw and actuator stem
guide to check for air leaks through the O-rings.
13. Clean any dirt and other foreign material from the
plug stem.
14. If an air filter is supplied, check and replace car-
tridge if necessary.
VALVE DISASSEMBLY AND REASSEMBLY
Disassembling the Body
To disassemble the valve body, refer to Figures 1 and
4 then proceed as follows:
WARNING: Depressurize line to atmospheric pres-
sure and drain all fluids before working on the
valve. Failure to do so can cause serious injury.
1. If valve is air-to-open, apply air under the piston to
lifttheplugofftheseatbeforetakingthevalveapart.
If valve is air-to-close, proceed to step 2.
2. Remove the bonnet flange bolting and lift actuator,
bonnet and plug out of the valve.
CAUTION:Heavyactuatorsmayrequireahoist.
Lift the valve with the yoke legs using a lifting
strap and a hoist. Great care should be taken to
lifttheactuatorandplugstraightoutofthebody
to avoid damage to the plug and seat.
3. Lift retainer, seat ring and gaskets free of the body.
4. Check to see the seating surfaces on both the seat
ring and plug are free of damage to ensure tight
shutoff. Make sure the gasket surfaces on the seat
ring, bonnet and body are clean and undamaged.
5. To inspect the plug, remove by loosening the stem
clamp and gland flange and by taking off the yoke
clamps.
Quick-check
Prior to start-up, check the control valve by following
these steps:
1. Stroke the valve and observe the plug position
indicatoronthestemclampcomparedtothestroke
indicator plate. The plug should change position in
a smooth, linear fashion.
2. Check for full stroke by making appropriate instru-
mentsignalchange:3-15,3-9, 9-15 psi/0-1,0-0.6,
0.6-1 Bar or associated split ranges for pneumatic
positioners, 4-20 or 10-50 mA for electro-pneu-
matic positioners).
3. Check all air connections for leaks.
4. Adjust the packing nuts to slightly over finger-tight.
CAUTION:Donotovertightenpacking.Thiscan
cause excessive packing wear and high stem
friction that may impede plug movement.
5. Make sure the valve fails in the correct direction in
caseofairfailure.Thisisdonebyshuttingofftheair
supply and observing the failure direction.
6. After temperature excursion has occurred, bonnet
flangeboltingshouldberetightenedto ensure bon-
net gaskets do not leak. See Table III.
VALVE MAINTENANCE
Atleastonceevery six months,checkforproperopera-
tion by following the preventative maintenance steps
outlinedbelow.Thesestepscanbeperformedwhilethe
valve is in-line and, in some cases, without interrupting
service. If an internal problem is suspected, refer to the
“Valve Disassembly and Reassembly” section.
1. Look for signs of gasket leakage through the end
flanges and bonnet. Tighten flange and bonnet
bolting (if required). See Table III.
2. Check for fluid leakage to the atmosphere through
the pressure-balance sleeve, metal bellows seal
and body drain plug.
3. Examinethevalvefordamagecausedbycorrosive
fumes or process drippings.
4. Clean valve and repaint areas of severe oxidation.
5. Check packing box bolting for proper tightness.
Packing nuts should be slightly over finger-tight;
however,tightenonlyasnecessarytopreventstem
leakage.
CAUTION:Donotovertightenpacking.Thiscan
cause excessive packing wear and high stem
friction that may impede stem movement.
6. Ifthevalveissuppliedwithalubricatorfitting,check
lubricantsupplyandaddlubricantifnecessary.See
Table II for common lubricants.

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Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Standard
V-packing Twin V-packing Twin V-packing w/ Lantern Ring
Standard
Square Packing Twin Square Packing
Standard
Graphite Packing Twin Graphite Packing
Braided
Wiper
Rings (3)
Graphite
Rings (3) Graphite
Rings (2)
Twin Square
Packing
w/ Lubricator
Fitting
Twin Square
Packing
w/ Lantern
Ring
Braided
Wiper
Rings (2)
Vacuum Seal
V-packing
Vacuum Seal
Twin V-packing
(w/ Lantern Ring)
SafeGuard
Live-loaded
Packing Box
SureGuard
Packing SureGuard XT Packing
Live Loading
Virgin Teflon
V-rings (2)
Carbon-filled
Teflon
Backups
Kalrez
V-rings (2)
PEEK
Backups
Kalrez
V-rings (2)
Carbon-filled
Teflon
Backups
(not compressed)
(compressed)
E0030
Figure 2: Typical Packing Configurations
NOTE: See step 1 in ”Reasembling the Body” section.

1-6 Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
should be installed with the upper set. Lower
packing installed in extended bonnets or metal
bellowssealvalveswilldiminishtheintegrityof
the packing assembly.
The graphite guide liners should be replaced each
time the valve packing is replaced. Do not rebuild
the valve without graphite liners in the guides.
2. Reinsert the plug stem into the packing box, being
careful not to score the stem or the guides.
3. Turn actuator back onto the plug, without turning
the plug inside the bonnet. Make sure the gland
flangeandbonnetflangeareinplacebeforeengag-
ing the plug stem and actuator stem threads.
NOTE:Donotallowtheglandflangetocontactand
gall the polished plug stem.
Leave approximately three to four plug stem
threads exposed. Attach yoke clamp and gland
flange bolting. For valves with a 2-inch spud, be
sure the half rings are in place between the yoke
and bonnet. Firmly tighten yoke clamp bolting. The
packing box nuts should be just over finger tight.
4. Install new bonnet and seat gaskets with the bev-
eled edge up for Teflon gaskets.
5. Insert the seat ring into the body with the step side
down.Place the seatretainerinto thebodywith the
thin end of the cathedral window down.
NOTE: For ANSI Class 900 and above valves with
valve sizes
1
/ 2 - through 1
1
/ 2 -inch, the seat retainer
window should be placed in the body with the
window facing toward the valve ports. With valves
2-inches and larger, the retainer's bar should face
toward the valve ports.
6. Place air under the actuator piston on air-to-open
valves to retract the plug.
7. Lower the plug and bonnet squarely into the body.
Becareful nottoscratch orgall theplugas itenters
the body.
8. To properly align the seat ring and plug, first bring
the bonnet bolting to finger-tightness.
a. With pneumatic actuators, apply air pressure
abovethe pistonto seatthe plugin theseat ring.
Proceed to step 9.
b. With electric or hydraulic actuators, move the
actuator stem down until it is completely ex-
tended. Next, retract the actuator stem 1/8inch /
3.175 mm. Install the stem clamp onto the plug
stem / actuator stem and tighten the associated
bolting. Move the actuator stem completely
down.Adjustactuatorlimitswitchesaccordingto
the actuator’s operating manual.
NOTE:Withair-to-close,fail-openvalves,itmaybe
necessary to apply a small amount of air to the top
of the actuator to move the plug away from the
bonnet. Otherwise, plug galling may occur.
Turn the actuator off the plug and bonnet without
allowingtheplugtorotatewithinthebonnet.Pullthe
plug carefully through the packing box.
CAUTION: To avoid scoring guides and plug
stem, follow the above procedure exactly.
6. If the seat surfaces need remachining, both sur-
faces on plug and seat ring must be reworked. The
seatangleontheplugis30degrees(36degreesfor
CavControl and Channel Stream valves); the seat
ring,33degrees.Lappingisnotnecessaryifproper
assembly procedures are followed.
CAUTION: If remachining, protect the stem
while turning. Ensure concentricity of the seat
surface with the plug stem (or outside diameter
of the seat ring, if machining the seat).
7. To replace packing or change the packing box
configuration,fromunderneaththebonnetpushout
packing, spacer and guides with a dowel of the
same approximate size as the plug stem.
WARNING: For valves equipped with separable
end flanges, do not machine body gasket sur-
faces. Machining could cause failure of the
separable flange lip causing end gasket leak-
age and valve failure.
8. Ifseparableendflangesneedtoberemoved,fileoff
tack welds or pull rivets behind the flanges.
CAUTION: When using separable end flanges
and spiral wound gaskets, use gaskets with
outerbackuprings.Failuretodosocouldresult
in excess stress in some applications.
NOTE:Toprevent flangesfromdroppingoff during
shipping, a tack weld or stainless steel rivet has
been installed behind the end flanges.
Reassembling the Body
Toreassemblethe valvebody,referto Figures1,2and
4 then proceed as follows:
1. If the packing has been removed, refer to Figure 2
and reinstall new packing exactly as shown. Make
sure at least 1/8-inch is left at the top of packing box
for the top guide to enter. Different spacer lengths
permit a wide variety of packing configurations,
such as twin seal and vacuum-pressure packing.
WARNING: Valves with extended bonnets or
metal bellows seals must not have lower pack-
ing installed. Instead, lower packing rings

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Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
O
S
O
S
E0032
NOTE:Step9appliesonlytovalveswithpneumatic
actuators. If an electric or hydraulic actuator is
used, return the plug to the midstroke position and
proceed to tighten.
CAUTION: Failure to return the plug to a
midstrokeposition(electricorhydraulicopera-
tors only) will cause damage to the actuator
and / or the valve during the bonnet tightening
sequence. This is due to the inability of most
electric / hydraulic actuators to accommodate
the 1/16 inch / 1.60 mm back-drive during the
tightening sequence.
9. Forair-to-closevalves,skipthisstepandgotostep
10. For air-to-open valves, check for proper plug
seating as follows: When proper seating occurs,
the bonnet flange will be forced up against the
finger-tightbodyboltingwithsuchforcethatitwillbe
impossible to move the flange. If proper seating
does not occur, the bonnet flange can be wiggled
with light hand force. Should this occur, place air
undertheactuatorpistonandretracttheactuatorto
approximate midstroke position. Turn the plug out
oftheactuator plugstemone additionalthreadand
Figure 3: Air-action Configurations
repeat above seating procedure. When the bonnet
flange becomes tight against the finger-tight body
bolting, the plug is properly seated. If necessary,
repeat above procedure until proper seating occurs.
10. Move the plug to the extended (or closed) position
for pneumatic actuators and to the midstroke posi-
tion for electric, hydraulic or mechanical actuators.
Begin tightening the bonnet flange bolting in a
manner that will keep the bonnet flange square /
parallel with the body. Tighten the first bolt 1/6turn,
thentightentheboltdirectlyopposite1/6turnandso
onaround theflange.Firmly tightenall bolts evenly
andcompletelytocompressthebonnetgasketand
to seat the bonnet. Torque the bonnet bolts to the
suggested torque values in Table III.
11. Apply air over the piston to seat the plug. For all
throttlingvalves, adjustthestem clampso thatwith
fullinstrumentsignaltothe positionerthefullsignal
scribelineonthepositionercampointstothecenter
of the cam roller bearing.
NOTE: For on / off valves, the bottom of the stem
clamp should simply be lined up with the bottom of
actuator stem (plus or minus
1
/ 16 inch / 1.60 mm).
Air-to-Open Air-to-Close

1-8 Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Tightenthe stem clamp bolting. Propertightness is
important since this adjustment secures the actua-
torstemto the plugstem.Adjustthe strokeplateso
the stem clamp points to the “closed” position.
12. Ifthevalvehasbeentakenoutoftheline,makesure
the flow arrow indicates proper flow direction upon
reinstallation.
Table III: Suggested Bonnet Bolting
Torque Values (ft-lbs / Nm, ±10 percent)
Bolt
Size Carbon Stainless
(inches) Steel Steel
5/880 / 108 50 / 68
3/4140 / 190 90 / 122
7/8230 / 312 150 / 203
1 350 / 475 220 / 298
11/8510 / 690 330 / 447
11/4730 / 990 460 / 624
13/8990 / 1342 630 / 854
11/21320 / 1790 840 / 1140
15/81710 / 2318 1080 / 1484
13/42170 / 2942 1400 / 1898
17/82700 / 3660 1700 / 2305
2 3350 / 4542 2100 / 2847
Disassembling the Actuator
With air-to-open valves, the actuator may be disas-
sembled while on the valve. With air-to-close valves,
the actuator must be removed from the valve prior to
disassembly. To disassemble the actuator, refer to
Figures 1, 3 and 5 then proceed as follows:
NOTE: Steps 1 through 4 apply to removing the actua-
tor from the valve. If disassembly is to take place with
the actuator still attached to the valve, go on to step 5.
1. Makesuretheplugisneitherseatedontheseatring
norback-seatedagainstthebonnetbyattachingan
air hose on the appropriate side of the cylinder and
release the pressure on the opposite side.
CAUTION: Galling of critical surfaces may re-
sult if the plug is not positioned correctly be-
tween the seat ring and bonnet.
2. Loosen the stem clamp.
3. Remove packing box bolting and yoke clamps.
4. Completely turn the actuator off the plug and bon-
net without rotating the plug inside the bonnet.
CAUTION: Do not allow the plug to drop and
impact against the seat after turning the actua-
tor off the plug threads.
5. Disconnect tubing.
6. Remove the adjusting screw to relieve the spring
compression.
WARNING: The spring compression must be
relieved before further disassembly; other-
wise, serious personal injury can occur dur-
ing disassembly.
7. Remove the retaining ring from the groove at the
base of the cylinder by using two screwdrivers,
inserting them in the ring’s slot and prying the ring
from the groove.
8. Pullthecylinderoffofyokeandpiston.SomeO-ring
resistancemay be felt.Remove springfor cleaning
and inspection (air-to-open configuration only).
WARNING: Do not use air pressure to remove
cylinder. Serious personal injury can occur.
9. To remove the spring on air-to-close configura-
tions, remove the piston retaining nut and slide
pistonoffofthe actuator stem.Thespringmaynow
be removed.
NOTE: Step 10 can only be performed if the actua-
tor has been removed from the valve.
10. To inspect the actuator stem O-ring, remove the
stem clamp and bellows. Push the actuator stem
throughtheyoke,beingcarefulnot togallthestem.
The O-ring may now be removed for replacement.
NOTE: The actuator stem bushings are pressed
into the yoke; it is not necessary to remove the
bushing to replace the actuator stem O-ring.
Reassembling the Actuator
To reassemble the actuator, refer to Figures 1, 3 and 5
then proceed as follows:
1. All O-rings should be replaced and the new ones
lubricated with a silicone lubricant (Dow Corning
55M or equivalent). Silicone O-rings must be lubri-
catedwithMagnalube-Glubricantorequivalent.Do
not use a silicone lubricant on silicone O-rings.
2. Makesure allinternal parts are thoroughly cleaned
and lubricated before beginning reassembly.
3. Iftheactuator stemhasbeenremoved, replacethe
piston stem O-ring and reassemble the piston and
actuator spacer on the actuator stem according to
the proper air-action (refer to Figures 3 and 5.) Air-
to-close configurations require the spring button to
be inserted under the actuator stem retaining nut.
Tighten the retaining nut firmly.
4. For air-to-close configurations, place the spring
under the piston and insert the actuator stem
through the yoke, being careful to not gall the stem
Bolt/Stud Material

1-9
Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
orthe bushings. Makesurethe springisretained in
the groove provided in the top of the yoke. For air-
to-open configurations, insert the actuator stem
through the yoke and place the spring and spring
button above the piston.
5. Installthecylinder, making suretheyokeis pushed
deepenough intothecylinder toallow the retaining
ring to be installed.
6. Reinsert the retaining ring by feeding it into the
groove a little at a time until it snaps in place.
Replace the stem bellows and stem clamp.
7. Using a new adjusting screw gasket, reinstall the
gasket and adjusting screw. Tighten the adjusting
screw only enough to provide an air seal with the
gasket. Do not over tighten.
NOTE: On air-to-open configurations, make sure
the hole in the spring button is directly centered
under the adjusting screw hole.
8. Apply air over the piston and place the actuator
subassemblyontothevalve,makingsurethegland
flange and bonnet flange are in place. For valves
witha2-inchspud,besurethehalfringsareinplace
between the yoke and bonnet. Engage the plug
stem and actuator stem threads. Carefully turn the
actuator clockwise until the plug stem is engaged
(three to four turns).
CAUTION: To avoid possible stem and / or seat
galling,donotallowtheplugtoturnontheseat.
9. Applysufficient airunder thepiston (forair-to-open
valves)oroverthepiston(forair-to-closevalves)to
preventtheplug headfromtouchingeitherthe seat
or the bonnet. Continue turning the plug stem into
the actuator stem until two to three plug stem
threads remain exposed.
CAUTION: Do not allow the gland flange to
contact or gall the polished plug stem.
CAUTION: To avoid possible stem and / or seat
galling,donotallowtheplugtoturnontheseat.
10. Applyairoverthepiston.Thiswilldrivethepluginto
the seat and lift the yoke off the bonnet approxi-
mately1/16 inch/1.60mm.Ifthespaceisnot1/16 inch
/ 1.60 mm, apply air under the piston to retract the
actuator stem and screw the plug in or out as
needed. Repeat this step until the 1/16 inch / 1.60
mm space is created.
11. Apply air under the piston and attach the yoke
clamps and packing box bolting. Tighten the yoke
clamp bolting firmly. The packing box nuts should
be just over finger-tight.
CAUTION:Donotovertightenpacking.Thiscan
cause excessive packing wear and high stem
friction that may impede plug movement.
12. Apply air over the piston to seat the plug. For all
throttlingvalves, adjustthestem clampso thatwith
fullinstrumentsignaltothe positionerthefullsignal
scribelineonthepositionercampointstothecenter
of the cam roller bearing.
NOTE: For on / off valves, the bottom of the stem
clamp should simply be lined up with the bottom of
the actuator stem ( ±
1
/ 16 inch / 1.60 mm).
Tightenthe stem clamp bolting. Propertightness is
important since this adjustment secures the actua-
torstemto the plugstem.Adjustthe strokeplateso
the stem clamp points to the “closed” position.
13. Reconnect the actuator / positioner tubing, supply
and signal lines.
REVERSING THE AIR-ACTION
Changing to Air-to-Open
To change the air-action from air-to-close to air-to-
open, refer to Figures 3 and 5 then proceed as follows:
1. Followtheinstructionsfordisassemblingtheactua-
tor (see “Disassembling the Actuator” section).
2. Reassemble the actuator with the spring, actuator
stem spacer and spring button over the piston. For
proper alignment, the center hole in the spring
button should engage the end of the adjusting
screw.
3. The positioner must also be changed. To do this,
refer to the appropriate positioner Installation,
Operation, Maintenance Instructions.
Changing to Air-to-Close
Tochangetheairactionfromair-to-opentoair-to-close,
refer to Figures 3 and 5 then proceed as follows:
1. Followtheinstructionsfordisassemblingtheactua-
tor (see “Disassembling the Actuator” section).
2. Reassemble the actuator with spring and actuator
stemspacerbelowthepiston.Thespringshouldsit
in the spring groove on top of the yoke. The spring
button is not used on air-to-extend configurations
and is stored above the piston (the actuator stem
retaining nut holds the spring button in place.)
3. The positioner must also be changed. To do this,
refer to the appropriate positioner Installation,
Operation, Maintenance Instructions.

1-10 Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
E0169
Packing Box Nut
(Item No. 117)
Gland Flange
(Item No. 80)
Upper Guide
(Item No. 87)
Stem Guide Liner
(Item No. 86)
Anti-Extrusion Spacer
(Item No. 93)
Upper Packing
(Item No. 88)
Packing Spacer
(Item No. 94-99)
Lower Packing
(Item No. 88)
Anti-Extrusion Spacer
(Item No. 93)
Stem Guide Liner
(Item No. 82)
Lower Guide
(Item No. 83)
Bonnet Flange Nut
(Item No. 114)
Bonnet Flange Stud
(Item No. 108)
Bonnet Flange
(Item No. 70)
Figure 4: Exploded View – Body Assembly
NOTE: Item numbers correspond directly to the valve's bill of material. Refer to it for specific part numbers.
End Flange
(Item No. 10)
Half Ring
(Item No. 11)
Clamp Bolt
(Item No. 107)
Yoke Clamp
(Item No. 76)
Bonnet
(Item No. 40)
Plug
(Item No. 50)
Bonnet Gasket
(Item No. 58)
Seat Retainer
(Item No. 30)
Seat Ring
(Item No. 83)
Seat Ring Gasket
(Item No. 55)
Body
(Item No. 1)
Clamp Nut
(Item No. 118)
Packing Box
Bolt
(Item No. 109)
Female Ring
V-Ring
Male Ring
Female Ring
Male Ring

1-11
Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
E0170
Figure 5: Exploded View – Actuator Assembly
NOTE: Item numbers correspond directly to the valve's bill of material. Refer to it for specific part numbers.
Actuator Stem
Lock Nut
(Item No. 348)
Spring Button
(Item No. 227)
Piston O-ring
(Item No. 271)
Piston
(Item No. 225)
Piston Stem O-ring
(Item No. 272)
Stem Spacer
Spring
(Item No. 229)
Lifting Ring
(Item No. 209)
Adjusting Screw
(Item No. 210)
Adjusting Screw
Gasket
(Item No. 248)
Cylinder
(Item No. 202)
Serial Plate
(Item No. 252)
Stem Clamp
(Item No. 249)
Stem Clamp Bolt
(Item No. 240)
Spring Button
(Item No. 227)
Spring
(Item No. 229)
Actuator Stem
Lock Nut
(Item No. 348)
Stem Spacer
(Item No. 228)
Piston O-ring
(Item No. 271)
Piston
(Item No. 225)
Piston Stem O-ring
(Item No. 272)
Actuator Stem
(Item No. 211)
Upper Stem Bushing
(Item No. 253)
Actuator Stem O-ring
(Item No. 275)
Lower Stem Bushing
(Item No. 254)
Yoke O-ring
(Item No. 274)
Yoke
(Item No. 201)
Stroke Plate
(Item No. 213)
Cylinder Retaining
Ring
(Item No. 256)
Stem Bellows
(Item No. 247)
Stem Clamp Nut
(Item No. 345)
AIR-TO-
RETRACT AIR-TO- EXTEND

1-12 Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Troubleshooting Chart
Problem Probable Cause Corrective Action
Stem motion 1. Overtightened packing 1. Adjust packing box nuts to slightly over finger-tight
impeded 2. Service temperature is beyond 2. Reconfirm service conditions and contact factory
operating limits of trim design
3. Inadequate air supply 3. Check for leaks in air supply or instrument signal
system; tighten loose connections and replace
leaky lines
4. Malfunctioning positioner 4. Refer to positioner maintenance instructions
Excessive 1. Improperly tightened bonnet 1. Refer to step 3 of “Reassembling the Body”
leakage flange bolting section for correct tightening procedure
2. Worn or damaged seat ring 2. Disassemble valve and replace or repair seat ring
3. Worn or damaged seat or 3. Disassemble and replace gaskets
bonnet gasket
4. Inadequate actuator thrust 4. Check for adequate air supply to actuator; if air
supply is adequate, reconfirm service conditions
and contact factory
5. Incorrectly adjusted plug 5. Refer to steps 8 - 10 of “Reassembling the Body”
section for correct plug adjustment
6. Improper flow direction 6. Refer to original specifications or contact factory
7. Improper handwheel adjustment 7. Adjust handwheel until plug seats properly
acting as a limit-stop
Inadequate 1. Improper plug adjustment, 1. Refer to steps 8 - 10 of “Reassembling the Body”
flow limiting stroke section for correct plug adjustment
2. Malfunctioning positioner 2. Refer to positioner maintenance instructions
3. Service conditions exceed trim 3. Verify service conditions and consult factory
design capacity
Plug slams 1. Incorrect plug adjustment 1. Refer to steps 8 - 10 of “Reassembling the Body”
allowing improper cushion of section for correct plug adjustment
air between actuator piston
and yoke
2. Inadequate air supply 2. Check air supply to actuator; repair leaks and
remove any restrictions in supply line
3. Trim sized too large for flow rate 3. Install reduced trim
Valve does 1. Incorrect flow direction 1. Reconfirm direction and, if necessary, correct flow
not fail in cor- direction through valve
rect position
Flowserve Corporation has established industry leadership in the design and manufacture of its products. When properly selected, this Flowserve product is designed to perform its
intended function safely during its useful life. However, the purchaser or user of Flowserve products should be aware that Flowserve products might be used in numerous applications
under a wide variety of industrial service conditions. Although Flowserve can (and often does) provide general guidelines, it cannot provide specific data and warnings for all possible
applications. The purchaser/user must therefore assume the ultimate responsibility for the proper sizing and selection, installation, operation and maintenance of Flowserve products.
The purchaser/user should read and understand the Installation Operation Maintenance (IOM) instructions included with the product, and train its employees and contractors in the safe
use of Flowserve products in connection with the specific application.
While the information and specifications presented in this literature are believed to be accurate, they are supplied for informative purposes only and should not be considered certified or
as a guarantee of satisfactory results by reliance thereon. Nothing contained herein is to be construed as a warranty or guarantee, express or implied, regarding any matter with respect
to this product. Because Flowserve is continually improving and upgrading its product design, the specifications, dimensions and information contained herein are subject to change
without notice. Should any question arise concerning these provisions, the purchaser/user should contact Flowserve Corporation at any of its worldwide operations or offices.
For more information about Flowserve, contact www.flowserve.com or call USA 972 443 6500
Regional Headquarters
1350 N. Mt. Springs Prkwy.
Springville, UT 84663
Phone [phone]
Facsimile 801 489 3719
12 Tuas Avenue 20
Republic of Signapore 638824
Phone [phone]
Facsimile (65) 862 4940
Flowserve and Valtek are registered trademarks of Flowserve Corporation.
12, av. du Québec, B.P. 645
91965, Courtaboeuf Cedex,
France
Phone [phone]
Facsimile (33 1) 60 92 32 99
1300 Parkway View Drive
Pittsburgh, PA 15205 USA
Phone [phone]
Facsimile 412 787 1944
FCD VLAIM001-21 ©1999 Flowserve Corporation. Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Quick Response Centers
5114 Railroad Street
Deer Park, TX 77536 USA
Phone [phone]
Facsimile 281 479 8511
104 Chelsea Parkway
Boothwyn, PA 19061 USA
Phone [phone]
Facsimile 610 497 6680