Flowserve Valtek VL-C Spring Cylinder Linear Actuators - Manual (Page 8)

54-8 Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611 FCD VLAIM054-00 © 2001 Flowserve Corporation. Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Troubleshooting
Problem Probable Cause Corrective Action
High air consumption or 1. Leaks in the air supply or instru- 1. Tighten connections and replace any
leakage ment signal system leaking lines
2. Malfunctioning positioner 2. Refer to appropriate positioner
maintenance bulletin
3. Leaks through O-rings or adjusting 3. Replace O-rings or gasket
screw gasket
Actuator does not move to 1. Air pressure in cylinder not venting 1. Refer to appropriate positioner
fail position upon loss because of faulty positioner maintenance bulletin
of air supply pressure 2. Spring failure 2. Replace spring
3. Internal valve problem 3. Refer to valve’s maintenance bulletin
Jerky or sticking 1. Insufficient air supply pressure 1. Check air supply and any filters or
stem travel regulators; check for leaking O-rings
2. Unlubricated cylinder wall 2. Lubricate cylinder wall with silicone
lubricant
3. Worn or damaged stem bushings 3. Check actuator stem for damage;
replace actuator stem, O-ring, and
stem bushings, if necessary
4. Improperly assembled spring 4. Disassemble actuator and check
cylinder and piston for damage;
reassemble actuator correctly
5. Internal valve problem 5. Refer to valve’s maintenance
instructions
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
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