Flowserve Valtek Tek-Check User Manual download pdf (Page 4)

User Instructions Tek-Check Valve - VLENIM0019-05 06/09

9. Tighten one bonnet nut

/4 of a turn. Tighten opposite nut

/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

/4 of a turn. Tighten opposite nut

/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.

Regional Headquarters

1350 N. Mt. Springs Prkwy.

Springville, UT 84663

Phone 801 489 8611

Facsimile 801 489 3719

12 Tuas Avenue 20

Republic of Signapore 638824

Phone (65) 862 3332

Facsimile (65) 862 4940

12, av. du Québec, B.P. 645

91965, Courtaboeuf Cedex, France

Phone (33 1) 60 92 32 51

Facsimile (33 1) 60 92 32 99

Quick Response Centers

9044-18th Street

Edmonton, AB T6P 1K6

Canada

Phone 780 449 4850

Facsimile 780 449 4851

5114 Railroad Street

Deer Park, TX 77536 USA

Phone 281 479 9500

Facsimile 281 479 8511

104 Chelsea Parkway

Boothwyn, PA 19061 USA

Phone 610 497 8600

Facsimile 610 497 6680

1300 Parkway View Drive

Pittsburgh, PA 15205

USA

Phone 412 787 8803

Facsimile 412 787 1944

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Flowserve Valtek Tek-Check User Manual Page 4

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