IMO-218 EN - Issue 8/2020
8
Once proper installation is done, check for smooth continuous
operation. If undesired operation occurs, check for correct pressure
and volume flow.
NOTE:
FLOW MAY BE RESTRICTED BY UNDERSIZE TUBING
OR FITTING. THESE MAY THROTTLE THE FLOW
RESULTING IN REDUCE PRESSURE OR VOLUME
CAUSING INTERMITTENT OR UNDESIRED MOVEMENT.
3.3 MOUNTING THE ACTUATOR
ON THE VALVE
CAUTION:
BE AWARE OF THE CUTTING MOVEMENT OF THE
VALVE!
Install the actuator so that the shaft of the valve or any other device
to be actuated goes into the shaft bore of the
actuator. If the bore is larger than the shaft diameter, use an adapter /
sleeve / bushing. RNP series actuator has double square female shaft
bore. Square bores are at an angle of 45° which allows the installation
position of the actuator to be changed in relation to the valve.
Figure 5.
Ways to install the actuator
RNP series actuator can be mounted on valve in any desired
position. However it is recommended to align the centerline of
the pneumatic actuator along the process pipeline. When the
installation position of the actuator is altered, the arrow indicating
the operating direction must be turned to correspond with the actual
operation of the valve.
When necessary, lubricate the actuator bore and collar with grease
or anti-corrosive agent to prevent it from jamming due to rust.
The actuator must not be allowed to come in contact with the
pipework, because the vibrations may damage it or cause
unsatisfactory operation.
In some cases, e.g. when using large actuators or with extensive
pipework vibrations, the actuator should be supported. Consult
Neles for instructions.
If the actuator is used with devices other than Neles valves, any
additional parts attached to the actuator must be properly protected.
3.4 OPERATING DIRECTIONS
NOTE:
SEPARATE INSTRUCTIONS ARE AVAILABLE FOR
ADJUSTING THE CLOSE LIMIT OF METAL-SEATED
BUTTERLY VALVES. REFER TO THE INSTALLATION,
OPERATING AND MAINTENANCE INSTRUCTIONS OF
THE VALVE.
RNP DOUBLE ACTING VERSION
Double acting actuator should be in close position when installed on
the valve in close position.
RNP SPRING RETURN VERSION
Install spring return actuator in fail safe position on the valve being
in corresponding position. In other words: spring to close actuator in
close position and valve in close position / spring to open actuator in
open position and valve in open position.
DEMOUNTING THE ACTUATOR FROM THE VALVE
CAUTION:
DEPRESSURISE THE ACTUATOR BEFORE STARTING
DEMOUNTING!
The actuator must be de-pressurized and the supply air
disconnected. Unscrew the actuator-side screws of
the bracket and pull the actuator off the valve shaft. For larger
actuators this is best done lifting the actuator from lifting lugs by
crane. Note the mutual positioning of the valve and the actuator to
ensure correct functioning after reassembly.
Summary of Contents for Easyflow RNP Series
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