Coax Quadax Series Manual de Instruções - Página 9
Procurar online ou descarregar pdf Manual de Instruções para Unidade de controlo Coax Quadax Series. Coax Quadax Series 11 páginas. Butterfly valves with actuator
Imprimir página6 Normal operation and maintenance
The valves are to be operated with the signals of the control. Valves which were delivered ex
works with the actuator are adjusted for correct operation and should not be re-adjusted as
long as the valve is in perfect working order.
For the manual emergency actuation on the actuator (if available) normal manual forces are
sufficient; the use of extensions to increase the actuation torque is not permitted.
Regular maintenance work on the valves is not required; however, when the line section is
inspected no leakage may escape to the outside on any valve. In such cases, please refer to
section 7 < Troubleshooting>.
It is recommended to actuate valves remaining in one position once or twice a year.
The prospective switching cycles of the valve are being calculated with the following formula:
( 4,000,000 / DN(mm) ). If the actual amount of switching cycles exceeds the calculated
number, please review with the manufacturer.
A butterfly valve is normally not self-locking:
The actuator may not be removed as long as the butterfly valve is pressurized.
Caution
A piston actuator is not self-locking
Piston actuators without spring reset require a permanent supply of control
pressure for all positions which are triggered under control pressure.
Note
7 Troubleshooting
When remedying faults, it is imperative that section 2 <Security notes> is observed.
Type of
malfunction
If an actuator with
spring reset
has to be removed
Leakage on the
flange connection or
plug or
housing cover
Leakage in the seat
seal
Version January 2011
Operating Instructions Quadax Series Butterfly Valves with Actuator
Risk of injury
Before the actuator is removed from the valve,
depressurize the pipeline and uncouple the actuator
from the control pressure supply.
Retighten flange screws.
If the leakage cannot be remedied in this manner:
repair required: replace seal. Observe section 2.3.
<Particular hazards> and request spare parts and
necessary manual from CO-AX.
Check whether the valve is 100% sealed.
If the valve is sealed:
Check whether the actuator closes with full torque.
If this is the case:
Open/ close valve repeatedly under pressure.
If the valve still leaks:
Increase torque in the "CLOSED" position to max.
1.1. x nominal torque.
If the valve continues to leak:
repair required: Replace seat seal. Observe section
2.3. <Particular hazards> and request spare parts
and necessary manual from CO-AX.
:
Measure
Note
Note 1:
Spare parts must be
ordered based on all
data contained on the
type plate. Only
original CO-AX spare
parts can be installed.
Note 2:
If after the removal it
is discovered that the
body and/ or the inner
parts are not
sufficiently resistant to
the medium, parts
made of a suitable
material are to be
selected.
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