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4.2 Dismantling the actuator off the valve
• Move actuator into central position by means of air pressure.
Danger: Please ensure that no compressed air can unintentionally escape from the actuator.
A pressure drop in the actuator may lead to a pre-tension between the valve and the actuator
spindle (1), blowing off the coupling (21) (when cylinder screws (22) are removed).
NOTE: For drives with manual positioning the actuator spindle (1) can also be brought into fitting
position via manual positioning.
• Loosen cylinder screws (22) and take coupling (21) off valve and actuator spindle (1).
• Relax actuator again by lowering control pressure or bringing the manual positioning into zero position
(turning safeguard (34) and marking on column (20) on the same level).
• Disconnect control air conduit from actuator (see chapter 4.3).
• Remove fastening nuts on the columns (20). Secure actuator against dropping.
• Take actuator off valve.
4.3 Connection of the control air conduit and components
Danger: When installing or dismantling the control air conduit please observe that it is pressure-
free, as otherwise parts may be blown off when loosening the connections.
For operating mode SC, the control air conduit must be connected to the bottom cover and for operating
mode SO to the top cover. The connecting thread is NPT ¼ or G ¼.
Attention:The control air conduit may only be impinged with control pressure on the opposite side of the
springs (pressure room). The connecting drill hole on the spring side must be closed with the
supplied stopper, so that dirt cannot enter and air can escape during movement.
If an existing position regulator is dismantled and re-installed, please ensure that the position of the regulator
is not changed. If the position regulator is exchanged the parameters for the new one must be adjusted to
the old ones. The nominal stroke must not be exceeded.
4.4 Reversal of the operating mode and exchanging spares
For all the installations carried out here, the actuator must be taken off the valve (see chapter 4.2). If the
operating mode or the spring force has been altered, the type label must also be altered.
4.4.1 PA-N 160 and PA-N 280 without manual positioning
The following steps are necessary to dismantle the actuator:
• Remove hexagonal screws short (15) and the respective nuts (18) and washers (16) from the covers (11
and 14).
• Loosen hexagonal screws long (17) evenly until the pre-tension of the pressure springs (13) has been
relaxed completely. Then remove them along with the respective nuts (18) and washers (16).
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