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EH (1-1/2x1 through 8x6)
July 2017
Maintenance
Valve parts are subject to normal wear and must be inspected and replaced as necessary. Inspection and maintenance
frequency depends on the severity of service conditions. This section includes instructions for packing lubrication,
packing maintenance, adding packing rings, replacing packing, trim removal, valve plug maintenance, lapping seats,
and trim replacement. All maintenance operations can be performed with the valve in the line.
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 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 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.
Table 7. Recommended Torque for Packing Flange Nuts
STEM
DIAMETER
mm
Inches
12.7
19.1
25.4
31.8
1‐1/4
1. Includes intermediate class ratings.
Note
Whenever a gasket seal is disturbed by removing or shifting gasketed parts, a new gasket should be installed upon reassembly.
This is necessary to ensure a good gasket seal.
Note
If the valve has ENVIRO‐SEAL live‐loaded packing installed (figure 3), see the Fisher instruction manual entitled ENVIRO‐SEAL
Packing System for Sliding‐Stem Valves (D101642X012) for packing instructions.
If the valve has HIGH‐SEAL heavy‐duty live‐loaded packing installed, see Fisher instruction manual entitled HIGH‐SEAL Live‐Loaded
Packing System (D101453X012) for packing instructions.
6
VALVE
BODY
RATING(1)
CL1500
1/2
CL2500
CL1500
3/4
CL2500
CL1500
1
CL2500
CL1500
CL2500
TORQUE
NSm
Min
Max
15
22
18
24
34
50
41
61
52
77
61
91
68
102
81
122
Instruction Manual
D100394X012
LbfSFt
Min
Max
11
16
13
18
25
37
30
45
38
57
45
67
50
75
60
90
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