Flowserve Valtek Tek-Check Guide

19-1
GENERAL INSTRUCTIONS
Valtek®Tek-Check is a high performance piston check
valve featuring piston and non-slam piston designs.
Manyfeatureshavebeenincorporatedintothedesignto
maintain maximum interchangeability with other
FlowserveTM valves.
The following instructions are designed to assist in
unpacking, installing and preforming maintenance as
requiredonTek-Checkvalves.Productusersandmain-
tenance personnel should thoroughly review this bulle-
tin prior to performing any maintenance on the valve.
Toavoidpossibleinjurytopersonnelordamage
to valve parts, WARNING and CAUTION notes
mustbestrictlyadheredto.Modifyingthisprod-
uct, substituting nonfactory parts, or inferior
parts, or using maintenance procedures other
than outlined could drastically affect per-
formance and be hazardous to personnel and
equipment.
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,supportmustbegiventopreventthe
actuator from rotating. Failure to do so can
cause serious injury to personnel, damage to
the valve or nearby equipment.
3. Contactyourshipperimmediatelyifthereisshipping
damage.
4. Shouldanyproblemarise,callyourrepresentative.
Installation
1. Before installing valve, clean the line of dirt, scale,
welding chips, and other foreign material.
2. ValtekTek-Checkvalvesaredesignedtoopenwith
as little as five psi (0.34 Bar) pressure difference
across the valve. Smaller sized non-slam piston
check valves (4-inch and smaller) can be mounted
in vertical lines with the addition of a spring posi-
tioned behind the piston.
3. Double-check flow direction to be sure valve is
installed correctly. Flow direction is shown by the
arrowattachedtothebodyflange.Ifflowarrowisnot
attached, refer to Figure 1 or 2 for proper flow
direction.
CAUTION: Valve will not operated if installed
incorrectly.
Valtek Part No. 10076401
Valtek Tek-Check
Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Check Valves

19-2
WARNING: Drain all the fluids from the valve and
depressurizethelinetoatmosphericpressure.Fail-
ure to do so can cause serious injury.
1. Removebonnetflangeboltingandliftbonnetflange
and bonnet out of the valve. If the valve is installed
in a vertical line, remove spring found between the
piston and the bonnet.
WARNING: Bonnets on valve size 8-inch and
largerareheavyandshouldbeliftedwithahoist
using the lifting ring attached to the top of the
bonnet. Failure to do so can cause injury.
2. Liftpiston,retainer,gaskets,andseatringoutofthe
body. Check for signs of galling and scoring be-
tween the piston and retainer. If galling exists, call
yourFlowserve representative.
3. Check piston seals for wear. Replace if necessary.
4. Check for dirt buildup in piston’s ball check valve.
Remove ball seat using a screwdriver. A slot is
provided in the top of the seat for easy removal.
Removeballandspring.Checkspringforbreakage
and dirt. Replace broken or damaged parts.
Quick-check
After valve is installed in the line, check for correct
operation as follows:
1. Pressurizeline,bothupstreamanddownstream,of
the valve.
2. Drainoffupstreampressureuntilvalvecloses.Most
valvesmountedinahorizontalpipelineshouldclose
when the upstream pressure is one psi (0.07 Bar)
less than the downstream pressure.
3. Increasing the upstream pressure to five psi (0.34
Bar) more than the downstream pressure should
open valve.
4. Whenvalveisclosed,checkfornoticeableleakage.
Ifleakageexists,refertothe‘Troubleshooting’sec-
tion.
GENERAL MAINTENANCE ON NON-SLAM
PISTON CHECK VALVES
Disassembly
Todisassemblethenon-slampistoncheckvale,referto
Figure 1 and proceed as follows:
Figure 1: Non-slam Piston Check Valve
NOTE: Item numbers correspond directly to valve's bill of material. Refer to it for specific part numbers.
Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Bonnet
(Item No. 40)
Retainer Gasket
(Item No. 56)
Bonnet Gasket
(Item No. 58)
Half Ring
(Item No. 11)
Body
(Item No. 1)
Orifice
(Item No. 130)
Seat Ring
(Item No. 20)
Seat Ring
Gasket
(Item No. 55)
End Flange
(Item No. 10)
Lifting Ring
(Item No. 210)
Bonnet Flange
Bolting
(Item No. 108/114)
Bonnet Flange
(Item No. 70)
Retainer
(Item No. 30)
Piston Seal
(Item No. 65)
Ball Seat
(Item No. 65)
Ball
(Item No. 132)
Spring
(Item No. 133)
Piston
(Item No. 50)
(downstream)
(upstream)

19-3
4. With a hex key, install the orifice in the piston.
5. Placesealsonthepistongrooveandlowerthepiston
squarely into retainer. The piston should be able to
move inside the retainer. If strong resistance is felt,
remove the piston and seals and reassemble.
6. Replace bonnet and sleeve gaskets.
7. Install bonnet and bonnet flange (and spring if
mounted in vertical line).
8. To properly align seat ring and plug, bring body
bolting to finger tightness. Remove lifting ring from
top of bonnet, insert 1/4-inch diameter metal rod and
tap several times with a hammer. This allows piston
to self-center the seat ring and ensure tight shutoff.
9. Tightenonebonnetbolt1/6ofaturn.Tightenopposite
bolt 1/6of a turn. Proceed until all bolts are tightened
evenlyandcompletely,seating thebonnetmetal-to-
metal in body. The bottoming of the bonnet in the
body can easily be felt through the wrench.
CAUTION: Insufficient tightening of the bolting
causes poor gasket compression and can result
in leakage.
5. Withahexkey,removetheorifice,makingsurethe
orifice bore is free of dirt.
6. Check vent passages in piston to make sure they
arefreeofdirtandotherforeignmaterial.Cleanwith
appropriate solvent if necessary.
7. Check seat ring and piston seating areas for dam-
age. If seating surfaces need remachining, the
angle on the seat ring is 33 degrees; the angle on
theplugis30degrees.Remachinesurfacesofboth
parts if required.
Reassembly
Toreassemblethenon-slampistoncheckvalve,referto
Figure 1 and proceed as follows:
1. Replace seat ring gasket.
NOTE:Gasketsshouldbereplacedeachtimedisas-
sembly takes place.
2. Insert the seat ring and the retainer.
3. Reassembleballcheckvalveinpiston.Insertspring
and ball and crew seat into place until the seat is
firmly seated metal-to-metal with the piston.
Figure 2: Piston Check Valve
NOTE: Item numbers correspond directly to valve's bill of material. Refer to it for specific part numbers.
Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
FLOW
Spring
(Item No. 133)
End Flange
(Item No. 10)
Half Ring
(Item No. 11)
Seat Ring
(Item No. 20)
Seat Ring
Gasket
(Item No. 55)
Body
(Item No. 1)
(downstream)
(upstream)
Bonnet
Flange
Bolting
(Item No. 108/114)
Bonnet Cap
(Item No. 40)
Bonnet
Gasket
(Item No. 58)
Retainer
(Item No. 30)
Piston
(Item No. 50)

19-4
FCD VLAIM019-05 ©2000 Flowserve Corporation. Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Troubleshooting
If difficulty is suspected with the non-slam piston check
valve, do the following:
1. Check for the proper full-stroke operation as indi-
cated in ‘Quick-check’section.
2. Check for leaks through the gaskets. The gaskets
should be replaced whenever the valve is disas-
sembled.
3. Theseatringmaybeoutofalignmentwiththepiston.
Check step 8 in ‘Reassembly’section on page 3 for
properprocedureonaligningtheseatringandpiston.
4. Make sure the valve is properly installed in the line
with correct flow direction.
5. If the piston sticks, disassemble the valve and clean
thoroughly.
GENERAL MAINTENANCE ON PISTON
CHECK VALVES
Disassembly
Todisassemblethepistoncheckvalve,refertoFigure2
and proceed as follows:
1. Removebodyboltingandliftbonnetcapoutofvalve.
2. Liftspring,piston,retainer,gaskets,andseatringout
of the body. Check for signs of galling and scoring
betweenpistonandretainer.Ifgallingexists,callyour
Flowserve representative, or the factory.
3. Checkthepiston’sventpassagesfordirtbuildupand
other obstacles. Clean with appropriate industrial
solvent if necessary.
4. Checkseatringandpistonseatingareasfordamage.
If remachining is attempted, care must be taken to
matchtheoriginalplugsurfacecontour.Theseatring
seating area can be remachined to a 33 degree
angle; the plug angle is 30 degrees. Remachine
surfaces of both parts if required.
Reassembly
Toreassemble the piston check valve, referto Figure 2
and proceed as follows:
1. Replace the seat ring gasket.
NOTE:Gasketsshouldbereplacedeachtimedisas-
sembly takes place.
2. Insert seat ring.
3. Install the retainer and piston.
4. Position the spring in top of the piston.
5. Replace bonnet gasket and bonnet cap.
6. Tightenonebonnet1/6ofaturn.Tightenoppositebolt
1/6of a turn. Proceed until all bolts are tightened
evenlyand completely, seatingthebonnet metal-to-
metalinthebody.Thebottomingofthebonnetcapin
the body can be easily felt through the wrench.
CAUTION: Insufficient tightening of the bolting
causes poor gasket compression and can result
in leakage.
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, contact: For more information about Flowserve, contact www.flowserve.com or call USA 972 443 6500
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