Flowserve Valtek Tek-Check - Manual (Page 4)

4
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User Instructions Tek-Check Valve - VLENIM0019-05 06/09
9. Tighten one bonnet nut 1 /
4
of a turn. Tighten opposite nut 1 /
4
of a turn.
Proceed until all nuts are tightened evenly and completely seating
the bonnet metal-to-metal in the 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.
Troubleshooting
If difficulty is suspected with the non-slam piston check valve, do the
following:
1. Check for the proper full-stroke operation as indicated in the ‘Quick-
check’ section.
2. Check for leaks through the gaskets. The gaskets should be replaced
whenever the valve is disassembled.
3. The seat ring may be out of alignment with the piston. Check step 8
in ‘Reassembly’ section on page 3 for proper procedure for aligning
the seat ring and piston.
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.
Check for ease of movement of the piston inside the retainer. If a
problem persists, contact your Flowserve representative.
GENERAL MAINTENANCE ON PISTON CHECK VALVES
Disassembly
To disassemble the piston check valve, refer to Figure 2 and proceed
as follows:
1. Remove bonnet flange nuts and lift the bonnet flange and bonnet
from the valve.
2. Lift the spring, piston, retainer, gaskets, and seat ring out of the
body. Check for signs of galling and scoring between the piston
and the retainer. If galling exists, call your Flowserve representa-
tive.
3. Check the piston’s vent passages for dirt buildup and other ob-
stacles. Clean with appropriate industrial solvent if necessary.
4. Check the seat ring and piston seating areas for damage. If
re-machining is attempted, care must be taken to match the
original plug surface contour. The seat ring seating area can be
re-machined to a 33 degree angle; the piston angle is 30 degrees.
Re-machine surfaces of both parts if required.
Reassembly
To reassemble the piston check valve, refer to Figure 2 and proceed
as follows:
1. Replace the seat ring gasket.
NOTE: Gaskets should be replaced each time disassembly takes
place.
2. Insert the seat ring.
3. Install the retainer and piston.
4. Position the spring on top of the piston.
5. Replace the bonnet gasket, the bonnet and the bonnet flange.
6. Tighten one bonnet nut
1 /
4
of a turn. Tighten opposite nut 1 /
4
of a
turn. Proceed until all nuts are tightened evenly and completely
seating the bonnet metal-to-metal in the body. The bottoming of
the bonnet in 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 improv-
ing 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
Flowserve and Valtek are registered trademarks of Flowserve Corporation.
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