Troubleshooting Chart - Flowserve Valtek Mark One Installation, Operation & Maintenance Instructions Manual

Problem Probable Cause
Stem motion 1. Overtightened packing
impeded 2. Service temperature is beyond
operating limits of trim design
3. Inadequate air supply
4. Malfunctioning positioner
Excessive 1. Improperly tightened bonnet
leakage flange bolting
2. Worn or damaged seat ring
3. Worn or damaged seat or
bonnet gasket
4. Inadequate actuator thrust
5. Incorrectly adjusted plug
6. Improper flow direction
7. Improper handwheel adjustment
acting as a limit-stop
Inadequate 1. Improper plug adjustment,
flow limiting stroke
2. Malfunctioning positioner
3. Service conditions exceed trim
design capacity
Plug slams 1. Incorrect plug adjustment
allowing improper cushion of
air between actuator piston
and yoke
2. Inadequate air supply
3. Trim sized too large for flow rate
Valve does 1. Incorrect flow direction
not fail in cor-
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
12, av. du Québec, B.P. 645
1350 N. Mt. Springs Prkwy.
91965, Courtaboeuf Cedex,
Springville, UT 84663
France
Phone 801 489 8611
Phone (33 1) 60 92 32 51
Facsimile 801 489 3719
Facsimile (33 1) 60 92 32 99
12 Tuas Avenue 20
Republic of Signapore 638824
Phone (65) 862 3332
Facsimile (65) 862 4940
Flowserve and Valtek are registered trademarks of Flowserve Corporation.
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FCD VLAIM001-21 ©1999 Flowserve Corporation. Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611

Troubleshooting Chart

Corrective Action
1. Adjust packing box nuts to slightly over finger-tight
2. Reconfirm service conditions and contact factory
3. Check for leaks in air supply or instrument signal
system; tighten loose connections and replace
leaky lines
4. Refer to positioner maintenance instructions
1. Refer to step 3 of "Reassembling the Body"
section for correct tightening procedure
2. Disassemble valve and replace or repair seat ring
3. Disassemble and replace gaskets
4. Check for adequate air supply to actuator; if air
supply is adequate, reconfirm service conditions
and contact factory
5. Refer to steps 8 - 10 of "Reassembling the Body"
section for correct plug adjustment
6. Refer to original specifications or contact factory
7. Adjust handwheel until plug seats properly
1. Refer to steps 8 - 10 of "Reassembling the Body"
section for correct plug adjustment
2. Refer to positioner maintenance instructions
3. Verify service conditions and consult factory
1. Refer to steps 8 - 10 of "Reassembling the Body"
section for correct plug adjustment
2. Check air supply to actuator; repair leaks and
remove any restrictions in supply line
3. Install reduced trim
1. Reconfirm direction and, if necessary, correct flow
direction through valve
Quick Response Centers
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
Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
1300 Parkway View Drive
Pittsburgh, PA 15205 USA
Phone 412 787 8803
Facsimile 412 787 1944