bürkert 3320 Schnellstartanleitung Seite 41

Unscrew the pressure
compensation element
Mechanical manual
override
for changing the
valve position
Fig. 28: Mechanical manual override AG3
Remove blind cover or display module:
Devices with ATEX approval or IECEx approval are
secured with a magnetic lock.
The removal of the cover is described in the supple-
mentary instructions for the electromotive control valves
with ATEX approval and IECEx approval.
WARNING!
Carefully remove the display module so that the connection
cable and HMI interface are not damaged.
41
Turn
Close
Opening
Press and turn
English
Type 3320, 3321
Manual override of valve
→ To unlock, turn the display module or the blind cover counter-
clockwise and remove.
For devices with display module, take note of the con-
nection cable to the HMI interface.
Actuating valve mechanically:
WARNING!
The mechanical manual override may be used only when it is
de-energised, otherwise the device may be damaged.
→ To operate the valve mechanically, use an Allen key with width
across flats of 3 mm (AG2)/5 mm (AG3).
WARNING!
Maximum torque 2 Nm (AG2)/10 Nm (AG3). Exceeding the
torque when the valve end position is reached will damage the
mechanical manual override or damage the device.
→ Apply light pressure to lock the mechanical manual override
mechanism into place while turning the Allen key at the same
time (see "Fig. 27"and "Fig. 28").
Maximum tightening torque 2 Nm (AG2)/10 Nm (AG3)!
- Turn counterclockwise to open.
- Turn clockwise to close.
The valve position is to be detected on the mechanical position
indicator.