17 / 19
• 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 spindle (35)
tightly onto the spindle and secure with setscrew (8). Place the pressure springs (14 and/or 15) and the
ring (13) on the lower casing (12). Insert the spindle together with the screwed parts (1 – 6 + 8 + 35) into
the lower casing (12). Mount the upper casing (12) and the ring (17 only PA
-N 1080). Insert the long
hexagonal screws (18) into the actuator from above evenly distributed over the circumference. Insert 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 (12), 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 spindle (35) tightly onto
the spindle (1) and secure with setscrew (8). Insert the spindle together with the screwed parts (1 – 6 + 8
+ 35) 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 – 6 + 8 + 35). Mount the upper casing (12). Insert the long
hexagonal screws (18) into the actuator from above evenly distributed over the circumference. Insert 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) with the stopper (25) is not in the lower casing (12), screw it in.
• Insert the short hexagonal screws (19) from above into the remaining holes. Put on the washers (20) and
hexagonal nuts (21). Tighten all hexagonal nuts (21) evenly until the diaphragm (5) is compressed.
• With SO operation: Screw the ring (37) onto the spindle (35) and secure with setscrew (38).
• With SC operation: Connect the air pipe to the lower casing (12). Move the actuator into the central
position using air pressure.
Danger: Ensure that compressed air cannot escape accidentally from the actuator. A pressure
drop can cause compression when removing the ring (37).
Screw the ring (37) onto the spindle (35) and secure with setscrew (38). Depressurise the actuator once
more by reducing the air pressure. Disconnect the air pipe from the actuator (see Chapter 4.3).
• Move the leadscrew (40) downwards. Fasten the housing (36) with the cheese-head screws (42) to the
leadscrew (40). With PA
-N 540, ensure that the stroke indicator (39) is fitted appropriately.
• Bring the manual control into the zero position (stroke indicator on housing (36 & 39) between the
grooves on the manual control supports (43)).
4.4.3 PA
-N 2160 with & without Manual Control
Special fitting tools are required for changing spare parts in the actuator and for changing the mode of
operation. The manufacturer must be consulted prior to installation for this reason.
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