Removal; Releasing The Spring Tension In The Actuator - Samson EB 31a Mounting And Operating Instructions

11 Removal

The work described in this chapter may only be performed by
specialist personnel qualifi ed to perform the corresponding task.
DANGER
Risk of bursting due to improper opening of pressurised devic-
es and components!
Pneumatic rotary actuators are pressure equipment that can burst
if handled improperly. Projecting, fl ying components and frag-
ments can cause injuries or even death.
Before working on the actuator:
Depressurise the concerned plant parts and the actuator. Also
residual energy must be discharged.
WARNING
Danger of injury due to preloaded springs!
The rotary actuators are tensioned due to the compressed
springs. Furthermore, improper disassembly of the spring car-
tridge can lead to serious injuries.
Open the rotary actuator only according to the instructions, see
Chapter "11.1 Releasing the spring tension in the actuator".
Danger due to escaping exhaust air!
The actuator is pneumatically operated, therefore exhaust air
escapes after it is controlled.
When working near the actuator, wear eye and hearing
protection.
Danger of crushing due to moving actuator- and switching
shaft!
Before working on the actuator, interrupt and lock pneumatic
energy and the control signal.
Vent the actuator.
Do not allow the jamming of objects to hinder the operation
of the actuator- and switching shaft.
If the actuator- and switching shaft are blocked (e.g. due to
"seizure" if not actuated for a long period of time"), release
the residual energy of the actuator (spring tension) before re-
leasing the blockage, see Chapter "11.1 Releasing the spring
tension in the actuator".
Prior to disassembly, make sure that the following conditions are
met:
− The actuator is decommissioned, see chapter "10 Decommis-
sioning".
EB 31a_EN
December 2022 edition
Subject to technical changes
11.1 Releasing the spring tension in the
actuator
The end caps (22 and 23) are tensioned due to the compressed
springs. Furthermore, improper disassembly of the spring car-
tridge can lead to serious injuries.
Before starting work on the rotary actuator, disconnect all
pneumatic, hydraulic and electrical supply lines.
Depressurise the rotary actuator.
When disassembling the end cap, bring the rotary actuator
to the "closed" (0°) position and remove the fastening screws
correctly.
Disassemble one end cap after the other.
.
WARNING
Danger of damage to components due to incorrect
disassembly!
During disassembly, the compressed springs can be damaged
due to the uneven application of force.
When disassembling the end cap screws, observe the order,
see Figure 11-1.
When disassembling the end cap, maintain a constant
distance (A = B) between the actuator housing and the
housing interface, see Figure 11-2.
Figure 11-1: Disassembling the end cap screws
Removal
11-1