March 2024
Safety Guide
DOC.SG.HX.1 Rev. 2
7
Hytork XL-Series Actuators
Section 3: Hytork XL-Series Actuators
3.3 Maintenance
Before mounting or (dis)assembling the actuator, consult the
relevant sections of the installation, operation and maintenance
manual for more detailed maintenance information.
!
WARNING
Avoid personnel injury or property damage from sudden release
of process pressure or uncontrolled movement of parts. Before
performing any maintenance operations:
• Always wear protective gloves, clothing and eye wear.
• Disconnect any operating lines providing air pressure,
electric power, or a control signal to the actuator. Be sure
the actuator cannot suddenly open or close the valve.
• Do not remove the actuator from the valve while the valve
is still pressurized.
• Vent any pneumatic pressure from the actuator and relieve
any actuator spring pre-compression.
• Use lock-out procedures to be sure that the above
measures stay in eect while you work on the equipment.
• Never apply pressure to a partially assembled
actuator unless all pressure-retaining parts have been
installed properly.
• Check with your process or safety engineer for any
additional measures that must be taken to protect against
process media.
• Do not remove the pistons from the actuator body by
using air pressure when the end caps have been removed.
!
CAUTION
Do not turn out the travel stops completely when the actuator
is pressurized. When adjusting the travel stops and the actuator
is still pressurized, the travel stops can be “shot” away when
completely turned out.
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