76
NDX VALVE CONTROLLER
NOTE
It is recommended to replace both the pre
stage and the relay valve at the same time.
•
Disconnect power from the device.
•
Shut off supply pressure and make sure that the
actuator pressure is released.
•
Remove the device from the actuator mounting
bracket if there is limited working space in front
of the prestage cover (Disconnect the supply and
actuator piping if the device has to be removed).
•
Loosen the relay valve cover screws.
•
Remove the relay valve. It is recommended to use two
screwdrivers as levers to crank out the relay valve.
Fig. 84 NDX_512_
14.3.6
Installation of relay valve
NOTE
Make sure there is no debris in the small shaft
hole, eg. from the oring of the removed relay
valve. (see picture)
© Metso 2015
Installation
NOTE: make sure there is no debris in the small shaft hole, eg. from the o-ring of the removed relay
valve. (see picture)
WARNING: Do not use any tools to install the relay valve. It can be pushed on its place just by using
hands.
Fig. 85
WARNING
Do not use any tools to install the relay valve. It
can be pushed in place by hand.
•
Align the small and large shaft in corresponding
holes. Press the relay valve into the holes with a light
continuous force. Do not use excessive force as this
may indicate the relay valve is misaligned or the
orings are not lubed.
•
Reinstall the relay valve cover. Make sure the rubber
seal is still in place on the cover and undamaged.
•
Tighten the prestage cover screws.
•
Turn on the supply pressure.
•
Reconnect electricity to the device.
•
When pneumatic components are replaced, device
requires calibration.
Fig. 86 NDX_512_
Fig. 87
14 MAINTENANCE