10-8
Failure
Probable Cause
Corrective Action
Valve moves to failure
1. Failure of actuator O-ring
1. Replace actuator stem O-ring
position, excessive air
2. Failure of sliding seal assembly
2. Repair or replace sliding seal assembly
bleeding from transfer case
Jerky shaft rotation
1. Overtightened packing
1. Retighten packing box nuts to slightly over
finger-tight
2. Improper adjustment of lever arm on
2. Readjust lever arm (see step 1 in the
shaft causing arm to contact transfer case
Remounting Actuator section)
3. Cylinder wall not lubricated
3. Lubricate cylinder wall with silicone lubricant
4. Worn piston O-ring allowing piston to
4. Replace O-ring; if galling has occurred
gall on cylinder wall
replace all damaged parts
5. Worn actuator stem O-ring causing
5. Replace O-ring; if actuator stem is galled
actuator stem to gall on stem collar
replace it
6. Worn (or damaged) shaft bearings, shaft
6. Disassemble and inspect parts; replace
bearings or packing followers
any worn or damaged parts
Excessive leakage
1. Improper adjustment of external stroke
1. See
Adjusting External Stroke Stops
stops
section
2. Worn or damaged seat
2. Replace seat
3. Damaged disc seating surface
3. Replace disc and shaft
4. Improper handwheel adjustment acting
4. Adjust handwheel until disc seats properly
as limitstop
Leakage through line
1. Dirty line gasket surfaces
1. Clean gasket surfaces and reinstall valve
2. Improper sealing of line flanges
2. Tighten line flanges evenly and
completely (see Table I for proper torque)
3. Flange or pipe misalignment
3. Clean body bore and stem, replace packing
Leakage through
1. Loose packing box nuts
1. Tighten packing box nuts to slightly over
packing box
finger-tight
2. Worn or damaged packing
2. Replace packing
3. Dirty or corroded packing
3. Clean body bore and stem, replace packing
Disc interferes with body
1. Disc installed upside down
1. Reinstall disc
2. Worn shaft bearings
2. Replace shaft bearings
Disc interferes with line
1. Cement lining or heavy schedule pipe
1. Modify line to allow proper disc clearance
Valve slams, won't open, or
1. Improper valve installation
1. See step 2 in
Installation section and
causes severe water hammer
correct flow direction
Shaft rotates, disc remains
1. Missing or broken taper pins
1. Replace taper pins
open or closed
2. Broken shaft
2. Replace shaft, make sure shaft is not
overstressing on external stroke stop
Actuator operates, shaft
1. Broken internal actuator parts
1. Refer to appropriate actuator Maintenance
does not rotate
Instructions
Troubleshooting Valdisk Valves
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 and its products,
contact www.flowserve.com or call USA 972 443 6500
Manufacturing Facilities
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Springville, UT 84663
Phone 801 489 8611
Facsimile 801 489 3719
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Pittsburgh, PA 15205 USA
Telephone 412 787 8803
Facsimile 412 787 1944
©2001 Flowserve Corporation. Flowserve, Valtek and Kammer are registered trademarks of Flowserve Corporation.
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FCD VLAIM010-04
