1
NAF-Turnex pneumatic actuators
NAF 791290/92/94, sizes 0, 1-3 and 4-5
Maintenance instructions and spare parts list
Fi 74.59(3)GB
05.12
General
...........................................................
1
Maintenance ..................................... 2
Dismantling ........................................................................ 2.1
Checking for damage and wear .......................................... 2.2
To change the piston rod bearings, size 0 .......................... 2.3
To change the piston rod seal, sizes 1-3
and 4-5 .............................................................................. 2.4
To change the PTFE-coated bushes ................................... 2.5
Assembly ........................................................................... 2.6
Actuator with spring return .................... 3
Conversion of a double-acting actuator ............................. 3.1
To dismantle and assemble the spring-
return unit .......................................................................... 3.2
To dismantle the spring-return unit .................................... 3.3
To assemble the spring-return unit .................................... 3.4
Accessories ...................................... 4
Stem sleeves, sizes 1-3 ...................................................... 4.1
End position indication ....................................................... 4.2
Fitting the end position sensor ........................................... 4.2.1
Junction box ..................................................................... 4.3
Solenoid valves .................................................................. 4.4
Valve positioner ................................................................. 4.5
Manual operation device .................................................... 4.6
Spare parts ....................................... 5
Part number of spare parts kits .......................................... 5.1
Spare parts kits, sizes 0 and 1-3 ........................................ 5.2
Spare parts kits, sizes 4-5 .................................................. 5.3
Parts list .......................................... 6
Double-acting actuator, sizes 0 and 1-3 ............................. 6.1
Single-acting actuator, sizes 0 and 1-3 .............................. 6.2
Single- or double-acting actuators, sizes 4-5 ..................... 6.3
Contents
1. General
The actuators are designed to withstand a long period of
continuous operation at high loading, normally without
the need for servicing.
Air or an inert gas must be used as the actuating medium.
The air must be dried and thoroughly cleaned to prevent
wear of the cylinder bores, pistons and sealing rings.
Oil mist lubrication of the actuating medium is not
recommended. The maximum permissible pressure of the
actuating medium is 0.8 MPa (8 bar) and the maximum
permissable temperature is 80°C.
From the operating viewpoint, the actuator can be
installed in any position. However, it must not be
subjected to excessive radiant heat, vibrations or
other adverse circumstances that could damage its
components.
The actuator delivered from NAF AB is in fully operational
condition. For particulars of the correct connection/
commissioning, refer to the commissioning instructions
Fi 74.562 iGB.
These actuators normally require little or no maintenance.
However, after a long period of service, certain parts
may become worn or damaged, and will then have to be
replaced.
To minimize the time needed for overhaul or repair,
it is advisable to keep a suitable stock of spare parts.
These are available as individual components, but it is
economically preferable to purchase the spare parts kits
recommended by NAF, the compositions of which are
matched to different overhaul levels.
Size 0
Size 4 - 5
Size 1 - 3