Instruction Manual
D104425X012
V280 Valve
August 2019
6
D
Dual‐seal constructions can retain pressure and process fluid even after process pressure has been removed from both
sides of the valve. The ball should be partially opened to relieve this pressure before disassembling or removing the
valve from the line. Take additional care if the process fluid is hot, flammable, caustic, or hazardous.
D
A tip over hazard exists for the valve/actuator assembly. Ensure the valve/actuator assembly is properly secured and
always supported to prevent falling or rolling which may cause injury or property damage.
D
Use lock-out/tag-out best practices and procedures to be sure that the above measures stay in effect while you work on
the equipment.
D
The valve packing box housing 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.
D
Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
Packing Maintenance
Refer to figure 3 for details of the standard PTFE V-ring packing (left) and the ENVIRO-SEAL packing system (right). All
maintenance operations in this section may be performed on an unpressurized valve that is still installed inline.
Note
For additional information on the ENVIRO-SEAL packing system refer to the ENVIRO-SEAL Packing System Instruction Manual
(
).
Stopping Leakage
For standard PTFE V-ring packing, leakage around the packing follower may be stopped by tightening the packing
follower nuts. If the packing is relatively new and tight on the drive shaft, and if tightening the packing follower nuts
does not stop the leakage, the drive shaft may be worn or nicked so that a seal cannot be made. If the leakage comes
from the outside diameter of the packing, the leakage may be caused by nicks or scratches on the packing box housing
packing gland bore.
For ENVIRO-SEAL packing, optimal performance is obtained when the Belleville springs are compressed to the required
target load. The target load is the point where the springs are compressed to 85% of their maximum deflection.
Under normal conditions, the packing nuts should not require re‐tightening. However, when servicing, if the springs
do not remain at the target load of 85% compression, retighten the packing nuts (key 101) per the following:
1. Tighten the packing flange nuts (key 101) alternately and evenly, keeping the packing flange parallel with the valve
flange (see figure 3), until the Belleville springs are compressed 100% (or completely flat).
a. For PTFE packing, loosen each packing flange nut one half turn (180
°
of rotation)
.
2. The target load of 85% compression has now been reached. If leakage continues, replace the packing components
and inspect the packing box housing, packing gland bore, and valve drive shaft for damage as described in the
following procedures.
Replacing Packing
Replacing the packing requires bleeding off the system and removing the actuator from the valve. Valve/actuator
adjustments cannot be made correctly without observing the fully open or closed position of the valve ball (key 3). It is
not necessary to remove the valve from the pipeline to make adjustments if care is taken to note the position and
alignment of the actuator lever and valve shaft and to not disturb the actuator turnbuckle position.
