Packing Lubrication; Packing Maintenance - Fisher Design ED series Instruction Manual

Design ED & EAD Class 125-600
Valve Design (Class) Valve Size, Inches
Design ED Design ED
( (Class 150-600) )
WARNING
Avoid personal injury or property
damage from sudden release of process
pressure or bursting of parts. Before
performing any maintenance operations:
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 from both sides of the valve.
Drain the process media from both sides
of the valve.
D Vent the pneumatic 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 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.
Whenever a gasket seal is disturbed by
removing or shifting gasketed parts,
4
Table 2. Additional Shutoff Classification
Port Diameter, Inches
2-1/2 2-7/8
3 3-7/16
3 2-7/8
4 2-7/8
4 4-3/8
5-3/8
6
7
7
8
8
Note
Cage Style
Equal Percentage, Linear, Whis er I, Equal Percentage, Linear, Whisper I,
Cavitrol III, 1 stage
Cavitrol III 2 stage Cavitrol III, 2 stage
Equal Percentage, Linear, Whisper I,
Cavitrol III, 1 stage
Whisper III (A3, B3, D3, D3), Cavitrol III, 2 stage
Equal Percentage, Linear, Whisper I,
Cavitrol III, 1 stage
Cavitrol III, 2 stage
Equal Percentage, Linear, Whisper I,
Cavitrol III, 1 stage
install a new gasket during reassembly.
This ensures a good gasket seal
because the used gasket may not seal
properly.
Because of the care Fisher takes in meeting all
manufacturing requirements (heat treating,
dimensional tolerances, etc.), use only replacement
parts manufactured or furnished by Fisher.

Packing Lubrication

ENVIRO-SEAL or HIGH-SEAL packing
does not require lubrication.
If a lubricator or lubricator/isolating valve (figure 2) is
provided for PTFE/composition or other packings that
require lubrication, it will be installed in place of the
pipe plug (key 14, figure 18). Use a good quality
silicon-based lubricant. Do not lubricate packing used
in oxygen service or in processes with temperatures
over 260_C (500_F). To operate the lubricator, simply
turn the cap screw clockwise to force the lubricant into
the packing box. The lubricator/isolating valve
operates the same way except open the isolating valve
before turning the cap screw and then close the
isolating valve after lubrication is completed.

Packing Maintenance

For valves with ENVIRO-SEAL packing,
see the Fisher instruction manual,
ENVIRO-SEAL Packing System for
Sliding-Stem Valves, Form 5306, for
packing instructions.
Leakage Class
V (for port
diameters from 2 7/8 diameters from 2-7/8
through 8-inch with g
optional C-seal trim) optional C seal trim)
Note
Note