Fisher D500243X012 - Manual (Page 13)

Instruction Manual
D500243X012
1035/El-O-Matic Actuator
August 2012
13
Maintenance
Actuators parts are subject to normal wear and must be inspected and replaced as necessary. The frequency of
inspection and replacement depends upon the severity of service conditions. Instructions are given in subsequent
sections for disassembly and assembly of the actuator and for inspecting the actuator parts.
WARNING
Avoid personal injury from sudden release of process pressure. Before performing any maintenance operations:
D Do not remove the actuator from the valve while the valve is still pressurized.
D Always wear protective gloves, clothing, and eyewear when performing any maintenance operations to avoid personal
injury.
D Disconnect any operating lines providing air pressure, or a control signal to the actuator. Be sure the actuator cannot
suddenly open or close the valve during maintenance.
D Use bypass valves or completely shut off the process pressure. Relieve process pressure on both sides of the valve. Drain
the process media from both sides of the valve.
D Vent the power actuator loading pressure and relieve any actuator spring precompression.
D Use lock-out procedures to be sure that the above measures stay in effect while you are work on the equipment.
D The valve packing area may contain process fluids that are pressurized, even when the valve has been removed from the
pipeline. Process fluids may spray out under pressure when removing the packing hardware or packing rings.
D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
Actuator Disassembly
Remove the actuator from the valve, and remove any other auxiliary equipment from the actuator. (Note the positions
of the mounting bracket and accessories for re-assembly). Steps explaining the disassembly and assembly of parts
apply to both ends of the actuator. If necessary, refer to the valve instruction manual for removing and replacing the
valve in the pipeline.
Key numbers are shown in figure 11 for E Series, and figure 12 for P Series actuators, unless otherwise noted.
CAUTION
Butterfly valves must be in the closed position before attempting to remove them from the pipeline. The valve disc can be
damaged if the disc is not moved to the closed position.
1. Remove the actuator mounting bracket and any accessories.
2. When removing the actuator end caps, carefully follow the steps below.
Operationally check the actuator to ensure that the pistons are moved all the way to the center (towards the drive
shaft), before removing the actuator end caps. Use the index mark on the top of the drive shaft (see figure 4).
a. For Double Acting E and P Series Actuators: Remove socket head screws from both end caps with a metric hex
key. After the screws are removed, gently pry off each end cap. Be careful not to damage the end cap sealing
surfaces.