9-5. Application to Existing Control Valves
If the low-emission gland packing system is used for an existing control valve, please note the
following:
• If there are scratches on the inner surface of the stuffing box or on the surface of the stem
of the current valve, the specified seal performance of the system may not be achieved. If
scratches are found, replace the affected parts with new ones.
• Check if the low-emission gland packing system can be used for the current valve and
actuator by referring to the specification sheet for the system (SS2-SSL100-0100) or by
contacting us. Because the resistance to sliding of the low-emission gland packing system
is greater than for general gland packing systems, it may not be possible to use the system
with the current actuator. In addition, if it is used with the actuator, the shutoff differential
pressure will decrease. If supply air pressure to the actuator is increased in order to meet the
required shutoff differential pressure, check that the specifications for the pressure gauge
of the positioner and pressure reducing valve are satisfied and that there is no effect on the
pressure at the source.
• Check if the operating temperature range of the gland packing (main packing and adapter
packing) of the system meets the temperature requirements of the current control valve.
Attention is needed for the system with expanded graphite packing in particular, because
the operating temperature of the main packing used for this packing system is lower than
the operating temperature for general expanded graphite packing.
9-7
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