Instruction Manual
D100386X012
DandDAValves
June 2014
5
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 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.
D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
Table 3. Bolting Torque for Packing Box Nuts (Key 15)
VALVE
RATING
STEM
DIAMETER
MINIMUM
RECOMMENDED TORQUE
MAXIMUM
RECOMMENDED TORQUE
mm Inches NSm LbfSin NSm LbfSin
3600 psi or to CL1500
9.5
12.7
19.1
3/8
1/2
3/4
4
7
16
36
66
144
5
11
24
48
96
216
6000 psi or CL2500
9.5
2.7
19.1
3/8
1/2
3/4
5
9
20
42
78
180
7
12
30
60
108
264
9000 psi
12.7
19.1
1/2
3/4
6
20
54
180
8
30
72
264
10,000 psi
12.7
19.1
1/2
3/4
6
20
54
180
8
30
72
264
Valve body 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, trim maintenance, and lapping seating surfaces. All maintenance operations can be
performed with the valve in the line.
Note
Whenever a gasket seal is disturbed by removing or shifting gasketed parts, install a new gasket upon reassembly. This is necessary
to ensure a good gasket seal because the used gasket might not seal properly.
Packing Lubrication
Thevalvemighthaveanoptionallubricatororlubricator/isolatingvalve(figure2)inthetappedbonnet.Usethe
lubricator or lubricator/isolating valve for PTFE/composition or other packings that need lubrication. Use a silicon-base
(24 strony)
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