AUMA Part-turn gearboxes GS 50.3 - 250.3, primary reduction gearings VZ 2.3 - 4.3_GZ 160.3 - 250.3 - Manual (Page 13)

8.2 Worm gearboxes on ball valves
In case end stops require adjustment, set end position OPEN first.
If the exact end position of the valve cannot be seen through a
position marking at the valve shaft, the setting may have to be
done with the valve removed.
Setting end position OPEN
.
Remove all bolts (03) at limit stop housing (10) (figures D, E).
.
Turn valve manually to end position OPEN.
.
In case limit stop housing (10) has not yet rotated, turn it counterclockwise up to
the stop. .
If the holes of limit stop housing (10) do not align with the threads of the housing
(1), take off the limit stop housing (10) and replace it in the required position. .
Fasten bolts crosswise with a torque according to table 3.
.
If the position of the pointer cover does not correspond to the symbol OPEN,
slightly loosen the screws of the pointer cover. Turn the pointer cover to the
OPEN symbol and fasten the screws again.
Setting end position
CLOSED The end stop need not be set since the required swing angle has been set in the
factory.
If the swing angle does not match, refer to section 10.
9. Setting the end stops with mounted multi-turn electric actuator .
If worm gearboxes GS and multi-turn actuators are supplied on a
valve, the end stops as well as limit and torque switching should
already have been set by the valve manufacturer.
.
If the limit and torque switching have not yet been set, they have
to be set according to the operation instructions SA/SAR and the
specifications of the valve manufacturer.
.
The valve manufacturer states whether the valve should be limit
or torque seated.
9.1 Worm gearboxes on butterfly valves
.
Determine the overrun of the multi-turn actuator for both directions, i. e. how much
does the valve move after the motor has been switched off?
Setting end position CLOSED
.
Remove all bolts (03) at limit stop housing (figures D, E).
.
Change actuator to manual drive and move the valve manually to end position
CLOSED. .
In case limit stop housing (10) has not yet rotated, turn it clockwise up to the
stop. .
Turn limit stop housing (10) back counterclockwise by ½ turn. This ensures that
the mechanical end stop is not reached in electric operation and thus the valve
can close tightly, provided that torque seating has been specified.
.
If the fixing holes of limit stop housing (10) do not align with the threads of the
housing (1), take off the limit stop housing (10) and replace it in required
position.
.
Fasten bolts (03) with lock washers (04).
.
Fasten bolts crosswise with a torque according to table 3.
.
If the position of the pointer cover does not correspond to the symbol CLOSED,
slightly loosen the screws of the pointer cover. Turn the pointer cover to the
CLOSED symbol and fasten the screws again.
13
Operation instructions Worm gearboxes GS 50.3 – GS 250.3