Instruction Manual
D104727X012
DSV1000 Valve
June 2022
6
Packing Maintenance
Refer to figure 3 for details of the standard live-loaded PTFE packing. All maintenance operations in this section may be
performed on an unpressurized valve that is still installed inline.
Note
For additional information on the live-loaded packing system refer to the ENVIRO-SEAL Packing System Instruction Manual
(
).
Stopping Leakage
Optimum performance of the PTFE live-loaded packing system 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 box nuts per the following:
1. Tighten the packing flange nuts 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 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 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 shaft and coupler.
Refer to figure 3 which identifies the DSV1000 packing components by key number.
Packing Disassembly
1. Isolate the 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, shut off all pressure lines (or other power source) to
the power actuator, release pressure from the actuator, and disconnect the pressure lines from the actuator. Use
lockout/tagout procedures to be sure that the above measures stay in effect while disassembling the equipment.
WARNING
D
See the WARNING at the beginning of the Maintenance section for more information before removing the valve from
the pipeline.
D
Use proper lifting and rigging practices while moving the valve or valve/actuator assembly.
