ARCA 814 Series, Operating And Maintenance Manual

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11 Disassembly / assembly of the actuator ARCA Regler GmbH
22 / 28 Series 814 11.2022 / 1.1
11.3 Piston
DANGER
Danger of death and serious injuries as well as damage to property
due to high spring tension!
If the following instructions are disregarded, serious injuries resulting in
death as well as severe damage to property cannot be ruled out!
► It is imperative to follow the instructions and the given order below
► Observe warning notices
▪ Remove any positioner if fitted
▪ Decouple the actuator stem (2) and the valve stem
▪ Remove hex nuts (15) and bolts (14) evenly around the periphery
– DANGER! Under no circumstances must the 3 bolts (16) and
long nuts (17) be removed at this point; they will be used in the
next step to relax the springs (4, 5).
▪ Loosen the 3 long nuts (17) evenly in order to relax the springs (4,
5).
▪ In the case of O function "Air to open":
– Remove the upper actuator cover (11)
– Remove the compression springs (4, 5)
– With the aid of the mounting thread, withdraw the piston (21)
complete with stem (2).
▪ In the case of S function "Air to close":
– Remove the upper actuator cover (11)
– With the aid of the mounting thread, withdraw the piston (21)
complete with stem (2).
▪ Replace the sealing element (22) and guide bands (23)
Assembly
NOTICE! The guide bands (23) must be treated with a suitable lubricant
before the piston (21) is fitted. The threads of the screws (14) and bolts
(16) must also be treated with a suitable lubricant.
Refer to the [11.1] Procedure section for recommended lubricants.
11.4 Stem
▪ Disassembly according to [11.3] Piston section up to withdrawal of
the piston (21).
– Unfasten the lock nut (27) and unscrew and remove the hex bolt
(26)
– Screw the clamping ring (25) into the piston (21)
– Remove the segment rings (24)
– Pull the stem (2) out of the piston (21)
– Replace the O-ring (28)
11.5 Springs
▪ In the case of O function "Air to open":