Repairs; Replacement Of Defective Components; Removing The Position Indicator; Remove The Adjusting Screws, Actuator Version Before 2006 - Samson EB 31a Mounting And Operating Instructions

12 Repairs

If the operation of the rotary actuator is no longer compliant or if
it does not work at all, it is defective and must be repaired or
replaced.
NOTE
Damage to the actuator due to improper maintenance and
repair!
Do not perform maintenance and repair work on your own.
Contact the After Sales Service at PFEIFFER for maintenance
and repair work.
In special cases, certain maintenance and repair work may be
performed.
The work described in this chapter may only be performed by
specialist personnel qualifi ed to perform the corresponding task.
For decommissioning and disassembly, observe Chapter "10
Decommissioning" and Chapter "11 Disassembly".

12.1 Replacement of defective components

If it is necessary to disassemble the actuator for repair:
Remove the rotary actuator from the valve.
The disassembly of the rotary actuator is described below. In this
way, defective components can be reached and replaced.

12.1.1 Removing the position indicator

(see Figure 12-3 and Figure 12-1)
Figure 12-1: Disassembling the position indicator
Remove the screw (24).
Remove the position indicator (19) from the end of the shaft,
and use a screwdriver as a lever if necessary.
EB 31a_EN
December 2022 edition
Subject to technical changes
12.1.2 Remove the adjusting screws, actuator
version before 2006
(see Figure 12-3 and Figure 12-2)
Remove both adjusting screws (2) with washers (4) and lock
nuts (3).
Remove the seals (11) and replace them when replacing
spare parts.
Figure 12-2: Disassembling the adjusting screws
12.1.3 Remove the adjusting screws, actuator
version after 2006
(see Figure 12-3 and Figure 12-2)
Remove the lock nuts (3) with washers (4).
Remove the seals (11) and replace them when replacing
spare parts.
Unscrew both adjusting screws (2) to their stopping point.
Info
For fi nal disassembly, the end caps (22 and 23) as well as the
piston (25) must be disassembled beforehand, as the adjusting
screws can only be removed from inside the actuator
Carry out the disassembly of the adjusting screws according
to Chapter "12.1.4 End cap disassembly" and Chapter
"12.1.5 Piston disassembly".
Repairs
12-1