Instruction Manual
D104191X012
CCV-N Valve
October 2018
5
Packing Maintenance
Note
For valves with ENVIRO‐SEAL packing, see the Fisher instruction manual, ENVIRO‐SEAL Packing System for Sliding‐Stem Valves,
If there is undesirable packing leakage, first try to limit the leakage and establish a stem seal by tightening the packing
flange nuts.
If the packing is relatively new and tight on the stem, and if tightening the packing flange nuts does not stop the
leakage, it is possible that the valve stem is worn or nicked so that a seal cannot be made. The surface finish of a new
valve stem is critical for a good packing seal. If the leakage comes from the outside diameter of the packing, it is
possible that the leakage is caused by nicks or scratches around the packing box wall. If performing any of the
following procedures, inspect the valve stem and packing box wall for nicks and scratches.
Replace Packing
WARNING
Refer to the WARNING at the beginning of the Maintenance section in this instruction manual
1. Isolate the control valve from the line pressure, release pressure from both sides of the valve body, and drain the
process media from both sides of the valve. If using a power actuator, also shut off all pressure lines to the power
actuator, and releases all pressure from the actuator. Use lock-out procedures to be sure that the above measures
stay in effect while you work on the equipment. Observe the
Warnings
at the start of the Maintenance section.
2. Disconnect the operating lines from the actuator and any leak-off piping from the bonnet. Disconnect the stem
connector and remove the actuator from the valve.
valve stem (key 7, figures 6, 7, 8, 12, 13, and 14). Remove any travel indicator parts and stem locknuts from the
valve stem threads.
WARNING
To avoid personal injury or property damage caused by uncontrolled movement of the bonnet, loosen the bonnet by
following the instructions in the next step. Do not remove a stuck bonnet by pulling on it with equipment that can stretch
or store energy in any other manner. The sudden release of stored energy can cause uncontrolled movement of the bonnet.
