©COMEV
AL
V
AL
VE SYSTEMS
Technical Dept. Ref. IOM - PNEUMA
TIC
ACTUA
TORS
AF SERIES - Ed.20/1
1
Comeval V
alve Systems reserves the right to alter any technical data contained in this Manual without prior notice. Regularly updated data on www
.comeval.es
COLUMNLESS PNEUMATIC ACTUATORS AF SERIES
FOR DIAPHRAGM VALVES
Page 8
FAULT
POSSIBLE CAUSE
CORRECTING MEASURES
Valve is not
seat tight
Line pressure exceeding max. actuator closing
force
Check actuator selection or actuator spring
tension adjustment
Not enough air supply (double acting or single
acting spring opens)
Check air supply pressure and increase only
as required to achieve tightness, without
exceeding max.air supply pressure on actuator
nameplate
Wrong adjustment of positionner if existing
Check correct adjustment of positionner
Valve body worn out or some particle stuck
between diaphragm and body
Check valve body inside to discard damages
on the sealing area or particles
Valve diaphragm damaged
Check valve diaphragm to discard damages on
the sealing area
Actuator not correctly installed on to the valve
Check actuator installation onto the valve.
Refer to chapter 7
Spring broken (spring closes)
Check spring and replace if needed. Refer to
chapter 7
Technical support always available through our website www.comeval.es or your local distributor.
10. DISMANTLING THE ACTUATOR
ATTENTION!
The following points must be observed:
- Pressureless the pipe system.
- Pressureless the pneumatic supply connection of the actuator
- Remove actuator’s pneumatic supply / power supply if any electrical arrangement is present.
- Operating medium must be cool.
- Note chapter 3 for proper handling and lifting.
11. GOODS RETURN & DISPOSAL
- For any returned goods, the issuing company must provide information in written on any hazards and the precaution in case
of potentially polluting or harmful residues, or any mechanical damage that could present a health, safety or environmental
risk, as enforced by EU Health, Safety and Environment Law, including the Safety Data Sheet of the substances identified as
potentially hazardous.
- Actuators are recyclable and not expected hazard to the environment, with the exception of soft parts (PTFE and rubber
compounds) that should be disposed separately only by approved procedure, and no incineration is permitted.
12. WARRANTY / GUARANTEE
- The extent and period of warranty cover are specified in the “General Sales Terms” of COMEVAL VALVE SYSTEMS valid at
the time of delivery or, by way of departure, in the contract of sale itself.
- We guarantee freedom of faults in compliance with state-of-the-art technology and the confirmed application.
- No warranty claims are accepted for any damage caused as the result of incorrect handling or disregard of this Manual, Data
Sheet and relevant regulations.
- This warranty also does not cover any damage which occurs during operation under conditions deviating from those laid
down by specifications or other agreements.
- Justified complaints will be eliminated by repair carried out by us or by a specialist appointed by us.
- No claims will be accepted beyond the scope of this warranty. The right to replacement delivery is excluded.
- The warranty shall not cover maintenance work.
- Our guarantee coverage does not cover for any commissioning, maintenance or installation of the product or external parts.
- Our guarantee does not cover products proved to have been tampered with or faulted by material wear and tear.
- The Purchaser is responsible for checking that the incoming product is received in good condition and conforms to the
ordered specifications. In case of damage caused during transit it is necessary to immediately complain to the carrier within 24
hours. After this time carriers could not assume the derived costs. In case of any deviation in relation to order specifications,
please contact us.
