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4.2 Removing the Actuator from the Valve
• Move the actuator into the central position using air pressure.
Danger Ensure that compressed air cannot escape accidentally from the actuator. A pressure
drop in the actuator can cause prestress between the valve and actuator spindle (1) and ejection
of the coupling (22) (if the cheese-head screws (23) have been removed).
Note: With actuators with manual control, the actuator spindle (1) can also be brought into the correct
position via the manual control.
• Undo the cheese-head screws (23) and remove the coupling (22) from the valve and actuator spindle
(1).
• Depressurise the actuator once more by reducing the control pressure and bringing the manual control
into the zero position (stroke indicator on housing (36 & 39) between the grooves on the manual control
supports (43)).
• Disconnect control air pipe from the actuator (see Chapter 4.3).
• Protect the actuator (see Chapter 2)
• Remove the fixings nuts and screws from the actuator supports (9).
• Remove the actuator from the valve.
4.3 Connecting the Control Air Pipe & Add-on Parts
Danger: When fitting and removing the control air pipe, ensure that it is depressurised, otherwise
parts can be ejected when undoing the connections.
With SC operation, connect the control air pipe to the lower casing, and with SO operation to the upper
casing. The connecting thread is G ½.
Caution: The control air pipe may only be loaded with actuating pressure on the side opposite the springs
(pressure chamber). The connecting bores on the spring side must be sealed with the reducing
nipple (24) and stopper (25) so that no dirt can get in and air can escape during operation.
If an existing position control system is removed and refitted, ensure that the position of the control is not
changed. If the position control system is changed, the parameters of the new system shall be adapted to
the old. The nominal stroke may not be exceeded.
4.4 Operating Mode Reversal & Fitting Spare Parts
The actuator must be removed from the valve for all the fitting jobs undertaken here (see Chapter 4.2).
4.4.1 PA
-N 540 & PA-N 1080 without Manual Control
Proceed as follows to dismantle the actuator:
• Remove the short hexagonal screws (19) from the housing.
• Loosen the long hexagonal screws (18) evenly until the preload on the pressure springs (14 and/or 15)
has been dissipated completely. Then remove completely together with the ring (17 only PA
-N 1080).
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