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• With SO operation: Remove the upper casing (16). Remove the spindle assembly together with the
screwed parts (1 – 8) from the lower casing (12). Take the ring (13) and the pressure springs (14 and/or
15) from the lower casing (12). Should the guide (10) and/or screw connector (11) need to be renewed,
unscrew the screw connector (11) and remove the guide (10) from the lower casing (12).
Dismantling the spindle together with screwed parts (1 – 8) (Necessary when changing the O ring (3) or
changing the mode of operation): Loosen the setscrew (8) so that the thread of the nut (7) is visible.
Unscrew the nut (7) from the spindle (1). Remove the washer (6), diaphragm (5), disc (4), O ring (3) and
bush (2) from the spindle.
• With SC operation: Remove the upper casing (16), the pressure springs (14 and/or 15) and the ring (13).
Remove the spindle assembly together with the screwed parts (1 – 8) from the lower casing (12). If the
guide (10) and/or the screw connector (11) needs to be renewed, unscrew the screw connector (11) and
remove the guide (10) from the lower casing (12).
Dismantling the spindle together with screwed parts (1 – 8) (Necessary when changing the O ring (3) or
changing the mode of operation): Loosen the setscrew (8) so that the thread of the nut (7) is visible.
Unscrew the nut (7) from the spindle (1). Remove the bush (2), O ring (3), disc (4), diaphragm (5) and
washer (6) from the spindle.
Proceed as follows to fit the actuator:
• Clean all parts and inspect for damage. If necessary, rework the parts or replace with original parts.
• If necessary, insert the guide (10) into the upper casing (12). Secure with the screw connector (11).
• With SO operation: Put the bush (2), the O ring (3), the disc (4), the diaphragm (5; ensure that the
diaphragm fabric is on the disc side) and the washer (6) onto the spindle (1). Screw the nut (7) tightly
onto the spindle and secure with the setscrew (8). Place the pressure springs (14 and/or 15) and the ring
(13) onto the lower casing (12). Insert the spindle together with the screwed parts (1 – 8) into the lower
casing (12). Mount the lower casing (16) and the ring (17 only PA
-N 1080). Insert the long hexagonal
screws (18) into the actuator from above evenly distributed over the circumference. Push on the washers
(20) and hexagonal nuts (21) from below. Tighten the hexagonal nuts (21) evenly until the pressure
springs (14 and/or 15) are preloaded. If the reducing nipple (24) with the stopper (25) is not in the upper
casing (16), screw it in.
• With SC operation: Put the washer (6), the diaphragm (5; ensure that the diaphragm fabric is on the disc
side), the disc (4), the O ring (3) and the bush (2) onto the spindle (1). Screw the nut (7) tightly onto
spindle and secure with the setscrew (8). Insert the spindle together with the screwed parts (1 – 8) into
the lower casing (12). Put the pressure springs (14 and/or 15) and the ring (13) onto the spindle together
with the screwed parts (1 – 8). Mount the upper casing (16). Insert the long hexagonal screws (18) into
the actuator from above evenly distributed over the circumference. Push on the ring (17 only PA
-N 1080),
the washers (20) and hexagonal nuts (21) from below. Tighten the hexagonal nuts (21) evenly until the
pressure springs (14 and/or 15) are preloaded.
If the reducing nipple (24) together with the stopper (25) is not in the lower casing (12), screw it in.
• Insert the short hexagonal screws (19) into the remaining holes from above. Push on the washers (20)
and hexagonal nuts (21). Tighten all hexagonal nuts (21) evenly until the diaphragm (5) is compressed.
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