Instruction Manual
D103799X012
685SE/685SR Piston Actuator
September 2014
9
Table 7. Handwheel Specifications
ACTUATOR SIZE
OUTPUT THRUST HANDWHEEL DIAMETER
TURNS PER mm
OF TRAVEL
TURNS PER
INCH OF
TRAVEL
MAXIMUM RIM FORCE
REQUIRED
N lbs mm Inch N lbs
10 to 12 44482 10000 305 12 3.8 96 290 65
14 to 18 88964 20000 406 16 3.0 80 380 85
20 to 26 133447 30000 610 24 2.8 72 450 100
Maintenance
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, electric power, or a control signal to the actuator. Be sure the
actuator cannot suddenly open or close the valve.
D Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure
on both sides of the valve. Drain the process media from both sides of the valve.
D Use lockout procedures to be sure that the above measures stay in effect while you work on the equipment.
D The valve packing box 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, or when
loosening the packing box pipe plug.
D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
WARNING
The outer and inner spring cartridge (keys 23 and 57) contains a spring under compression. Do NOT attempt to dismantle
any part of the spring cartridge without first consulting your local Emerson Process Management sales office to avoid
personal injury.
Instructions are given below for complete disassembly of the actuator, seal replacement, and O-ring replacement. When
inspection or repair is necessary, disassemble the actuator only as far as is required to accomplish the job. Key numbers
referenced in the following steps are shown in figures 2, 3, 4, and 5.
Actuator Removal
Thefollowingprocedureisfortheremovaloftheactuatorfromavalve.
For 685SE actuators only: It may be necessary to apply a temporary loading pressure to the bottom cylinder pressure
connectiontomovethepistonrodawayfromthevalvestemduringremoval.Ifitisnotpossibletoprovidea
temporary loading pressure, exercise caution when removing the actuator to prevent damage to the valve stem or
piston rod.
(28 pages)
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