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Operating Instructions
BA 373-E66
Technical specifications subject to change
W. Bälz & Sohn GmbH & Co.
Koepffstrasse 5
74076 Heilbronn
Germany
Phone +49 (0)7131 15 00 0
Fax +49 (0)7131 15 00 21
www.baelz.de
Observe copyright protection DIN 34
4.3 Operating principle
Motorized linear actuators for modulating and open-close duty of control and process technology to operate control
valves. The self-locking stem/stem nut is driven by an electric motor via a gearing. This converts the rotary motion
into a linear motion. Load-dependent and travel-dependent switches define the stops for the end positions.
4.3.1 Manual adjustment
Figure 7: Manual adjustment
Do not disengage or engage the handwheel / disengaging lever while the motor is in motion.
Manual adjustment may only be done when the motor is not in motion. For the adjustment,
● push down the disengaging lever with your left hand in the direction of the extending connecting rod
● At the same time, turn the handwheel with your right hand until it has noticeably engaged
● To operate the linear actuator, turn the handwheel keeping the disengaging lever in engaged position
Turn the handwheel clockwise
➔
The actuator connecting rod extends
Turn the handwheel counter-clockwise
➔
The actuator connecting rod retracts
The linear actuator will automatically return to motor operation as soon as the disengaging lever is released.
4.4 Removing the cover
Disconnect the supply line before any maintenance procedures or adjustment of the actuator
● Unscrew the cap nut
● Remove the sealing washer
● Hold the cover on the jacket and slightly turn the cover while pulling it off
Danger