ARI Armaturen FA800 EN - Manual (Page 14)

Page 14 Rev. 0040504003 2310
Operating and installation instructions
Pneumatic actuators - FA160-800
- Put the upper diaphragm casing back on the diaphragm plate, eighth in the direction that
the ventilation and air connection are aligned with each other.
- Tighten the long hexagon bolts (pos. 50.18) to the specified torque (refer to the table) first,
then the short hexagon bolts (pos. 50.15); the bolts should always be tightened
symmetrically.
- The actuator can now be mounted to the valve again (refer to 5.5).
8.1.2 Replacement by operation mode „Spring opens on air failure“
- Disassemble the actuator from the FABA-Supra as described in 7.2.
- Loosen the short hexagon bolts (pos. 50.15) first, then the long hexagon bolts (pos.
50.18); the bolts should always be loosened symmetrically.
- Separate the upper diaphragm casing (pos. 50.9) from the lower diaphragm casing
(pos. 50.8).
- Gradually loosen the collar nut (pos. 50.14) on the stem (pos. 50.1) while steadying it on
the stem flat with a suitable tool.
- Remove the diaphragm flange (pos. 13) from the actuator. The defective diaphragm (pos.
50.11) is now freely accessible and can likewise be removed from the actuator. To replace
the springs (pos. 50.10), you must also remove the diaphragm plate (pos. 50.12) from the
actuator.
- Position four new springs on the lower diaphragm casing so that they are centred on the
casing cambers.
- Fit a new diaphragm and mount the diaphragm plate again. Note that a bolt hole in the
diaphragm and a camber of the diaphragm plate must be aligned with one another and
that the four springs must be exactly positioned over the plate cambers.
When inserting the diaphragm into the actuator, please also make sure that a camber is
exactly positioned over the vent plug in the lower diaphragm casing.
Fig. 9
ATTENTION !
- The springs will only have an optimal contact surface if they are aligned
correctly.
Actuator Hexagon bolts
(pos. 50.15 / no. 50.18)
Torque
FA160- FA400 M8 5 Nm
FA800 M10 15 Nm
ATTENTION !
- At the actuators FA160-FA400 are two and at FA800 are four longer screws
(Pos. 50.18) provided. As the last step, the screws are to be loosened equally, in
order to disassemble the initial spring tension.
Rolling diaphragm
Diaphragm plate
Spring
Ventilation