Removing The Valve; Seal Maintenance - Emerson Fisher Control-Disk NPS 14 CL150 Instruction Manual

Instruction Manual
D103545X012
CAUTION
Be careful when cleaning the packing box. Scratches to the upper shaft (key 3) or inside diameter of the packing bore might
cause leakage.
4. Before installing new packing, clean the packing box.
5. Install new packing one ring at a time, using the packing follower as a driver. If using split‐ring packing, stagger the
splits in the rings to avoid creating a leak path.
6. Reinstall packing parts. Refer to figure 9 for sequence of packing parts.

Removing the Valve

1. Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the
actuator cannot suddenly open the valve. Vent the power actuator loading pressure.
2. 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 either side of the valve.
CAUTION
Damage to the valve disk can occur if the disk is not closed when the valve is being removed from the pipeline. If necessary,
stroke the actuator to place the disk in the closed position while removing the valve from the pipeline.
3. Loosen the flange bolting that holds the valve. Make sure the valve cannot slip or twist while loosening and
removing the bolting.
4. Before removing the valve from the pipeline, make sure the valve disk is closed. Removing the valve with the disk
open could cause damage to the disk, piping, or pipe flanges.
5. After removing the valve from the pipeline, move the valve to an appropriate work area. Always support the valve
properly.
6. When valve maintenance is complete, refer to the Installation procedures in this manual.

Seal Maintenance

Note
For larger valves, it is possible to replace the seal (key 5) while the actuator is mounted to the valve and can be accomplished by
cycling the valve to 90 degrees open.
Key numbers in this procedure are shown in figure 9 unless otherwise indicated.
1. After removing the valve from the pipeline, remove the manual or power actuator. Manually rotate the upper shaft
(key 3) counterclockwise until the disk has moved a full 180 degrees away from the closed position.
WARNING
Avoid personal injury or property damage caused by the impact of a falling or tipping of a large valve. Support large valves
during maintenance.
Control-Disk NPS 14-36
April 2011
13