Flowserve Valtek Three-way Guide

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Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
ValtekThree-way
ControlValves
Valtek No. 49013
GENERAL INFORMATION
The following instructions are designed to assist in
unpacking, disassembling, reassembling and trou-
bleshooting Valtek®three-way control valves. Product
users and maintenance personnel should thoroughly
review this bulletin in conjunction with Installation, Op-
eration,MaintenanceInstructions1(MarkOneandTwo
Control Valves) prior to installing, operating or perform-
ing any maintenance on the valve.
This publication does not contain information on Valtek
positioners. Refer to the appropriate Installation, Op-
eration, Maintenance Instructions for installing, main-
taining, troubleshooting, calibrating, and operating
Valtek positioners.
To avoid possible injury to personnel or dam-
age to valve parts, WARNING and CAUTION
notes must be strictly adhered to. Modifying
this product, substituting nonfactory parts, or
using maintenance procedures other than out-
lined could drastically affect performance and
be hazardous to personnel and equipment, and
may void existing warranties.
Three-way valves are used for either converging or
diverging service. For interchangeability, a standard
globe valve converts to a three-way valve with the
addition of a three-way adaptor, upper seat ring, two
upperseat gaskets,and athree-way plug. Itsoperation
is similar to a standard Mark One globe valve.
Unpacking
1. Whileunpackingthevalve,checkpackinglistagainst
the materials received. Lists describing valve and
accessories are included in each shipping container.
2. When lifting the valve from the shipping container,
position the lifting straps to avoid damage to the
tubing and mounted accessories. Valves provided
with a lifting ring (up to 6-inch) may be lifted by the
actuator lifting ring. On larger valves, lift the valve
using straps through the yoke legs or if provided,
lifting brackets bolted to bonnet stud.
3. In the event of shipping damage, contact your ship-
per immediately.
4. If any problems arise, contact your Flowserve
representative.
Troubleshooting
Ifdifficulty issuspectedwith thecontrolvalve, checkthe
following:
1. Make sure the valve has a sufficient air supply.
2. Checkforairleaks intheairsupply,instrumentsignal
system, and positioner.
3. Make sure the packing isn’t too tight by lossening the
gland flange nuts and retightening to just over finger-
tight.
CAUTION: Do not overtighten the packing. This
cancauseexcessive packing wear andhighstem
friction which may impede plug movement.
Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611

3-2 Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
2. Install new seat ring gasket, lower seat ring and
retainer.
3. Insert the plug into the body.
CAUTION: Most three-way seat rings are non-
directional; however, on soft seat and special
seatrings make surethe proper seatingsurface
is facing the plug.
4. Install the upper seat ring and new gaskets.
5. Lower the three-way adapter over the plug stem
into the body. Make sure the three-way adapter is
aligned with the correct flow direction.
6. Replace the bonnet gasket.
7. Slide the bonnet over the plug stem, making sure
not to gall the plug stem.
CAUTION: Adapters more than two inches have
different gasket recess depths, and must be
installed with the correct bonnet gasket recess
in contact with the correct bonnet gasket re-
cess. Measure the depth of the upper gasket
recessinthebody. Thebonnetgasketrecessin
the adapter is the same depth.
8. Lowerbonnetflangeoverplugstemontothebonnet.
9. Insert guides and packing into the bonnet, follow-
ing the procedure outlined in Installation, Opera-
tion, Maintenance Instructions 1 (Mark One and
Two Control Valves).
10. Hand tighten the bonnet flange bolting.
11. Apply air to the cylinder so the actuator stem is at
mid-stroke.
12. Lower the actuator and gland flange into place.
Screw the plug stem into the actuator stem by
rotating the actuator in a clockwise direction.
13. Tighten the stem clamp.
14. Replace the yoke clamps.
15. Tighten the gland flange nuts slightly more than
finger tight.
CAUTION: Do not over tighten packing. This
can cause excessive packing wear and high
stem friction.
16. Stroke plug two or three times to center seat rings.
17. Seatthepluginthelowerseat ringwithair pressure
in the actuator. Tighten two opposing body bolting
nuts 1/6-turn. In this manner, tighten remaining
bolting 1/6-turn.
18. Continue to alternately seat the plug in the lower
and upper seat rings and to tighten the bolting
1/6- turn. Firmly tighten all bolting evenly and com-
pletely, using full wrench force to compress the
gaskets and to seat the assembly metal-to-metal.
Propertightnessrequiresconsiderableforce. How-
ever, the bottoming of the parts metal-to-metal can
be easily felt through the wrench.
19. When reinstalling the valve in the line, make sure
the flow is in the proper direction.
4. Check for proper, full-stroke operation as indicated
in the “Quick-check” section of Installation, Opera-
tion, Maintenance Instructions 1 (Mark One and
Two Control Valves).
5. If the valve does not function properly, check the
bonnet flange and three-way adapter for
squareness to the body. Gaps between the bonnet
flange and three-way adapter must be uniform for
proper operation. If the assembly is out of align-
ment,loosenthebodyboltingandtightenaccording
to steps 16-18 in the “Reassembly” section.
6. If problems still exist, disassemble the valve ac-
cording to the “Disassembly” section.
Disassembling Three-way Valves
To disassemble three-way valves, refer to Figure 1 and
proceed as follows:
WARNING: Depressurize line to atmospheric pres-
sure and drain all fluids before working on valve.
Failure to do so can cause serious injury.
1. Applyairtothecylindersothatplugisat mid-stroke.
2. Loosen the stem clamp and gland flange. Remove
yokeclamps(or yokebolts,if used). Disengagethe
plug stem from the actuator stem by rotating the
actuator in a counterclockwise direction.
CAUTION: Donot allowthe plug torotate. Flats
are provided on the plug stem so it can be held
with a wrench. Prevent the plug from dropping
into the seat ring when the actuator is removed.
Heavy actuators may require a hoist. If a lifting
ring is not provided, use lifting straps around
the yoke legs. Be aware that the center of
gravity may be above the lifting straps.
3. Remove the bonnet flange nuts and bonnet flange.
Carefully slide the bonnet up off the plug stem to
avoid galling.
4. Remove the three-way adapter by lifting it over the
plug stem.
CAUTION: Large adapters may require a hoist.
Lift the three-way adapter straight away from
the body to prevent damaging the plug stem.
5. Remove the upper seat ring and gaskets.
6. Remove the plug. Check the guiding and seating
surfaces for galling and scoring.
7. Remove the retainer, lower seat ring and seat
gasket. Check both seat rings for galling and
scoring.
Reassembling Three-way Valves
To reassemble three-way valves, refer to Figure 1 and
proceed as follows:
1. Clean all gasket surfaces.
NOTE: Use new gaskets whenever the valve is
disassembled.

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Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Figure 1:
Mark One Three-way Valve Body Subassembly
NOTE: Item numbers correspond directly to the valve's bill of material. Refer to the bill of material for specific part numbers.
Plug
(Item No. 50)
Seat Ring Gasket
(Item No. 55)
Gland Flange
Bolting
(Item No. 109/117)
Yoke Clamps
(Item No. 76)
Bonnet Flange
Bolting
(Item No. 108/114)
Three-way
Adapter
(Item No. 2)
Upper
Seat Ring
(Item No. 24)
Retainer
(Item No. 30)
Body
(Item No. 1)
Gland Flange
(Item No. 80)
Yoke Clamp
Bolting
(Item No. 107/108)
Bonnet Flange
(Item No. 70)
Bonnet Gasket
(Item No. 58)
Seat Ring
Gasket (2)
(Item No. 57)
Lower
Seat Ring
(Item No. 20)

3-4 Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
FCD VLAIM003-03 © 2000 Flowserve Corporation. Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
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 condi-
tions. 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, contact: For more information about Flowserve and its products,
contact www.flowserve.com or call USA 972 443 6500
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