8580 Valve
Instruction Manual
March 2010
7
Figure 3. Optional Shaft-to-Valve Body Bonding Strap
Assembly
replacing trim components, changing disk rotation or
valve action, and mounting and adjusting the
actuator.
As used in these instructions, actuator refers to
power actuators (such as pneumatic diaphragm,
piston actuators, and rack and pinion actuators).
WARNING
Avoid personal injury and property
damage from sudden release of
process pressure or bursting of parts.
Before performing any maintenance
operations:
D Do not remove the actuator from
the valve while the valve is still
pressurized.
D Always wear protective gloves,
clothing, and eyewear when
performing any maintenance
operations.
D Disconnect any operating lines
providing air pressure, electric power,
or a control signal to the actuator. Be
sure the actuator cannot suddenly
open or close the valve.
D 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
both sides of the valve.
D Vent the power actuator loading
pressure and relieve any spring
precompression.
D Use lock-out procedures to be
sure the above measures stay in effect
while you work on the equipment.
D The valve packing box may
contain process fluids that are
pressurized, even when the valve has
been removed from the pipeline.
Process fluids may spray out when
removing the packing hardware or
packing rings, or when loosening the
packing box pipe plug.
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 4 for available packing configurations.
All maintenance operations in this section may be
performed with the valve in the line. Packing may be
PTFE V-ring or graphite.
An ENVIRO-SEAL packing system is also available
with the 8580 valve. To install the ENVIRO-SEAL
packing system in an existing valve, follow the
instructions in the instruction manual included with
the packing system (D101643X012). To remove
packing parts in a valve with the ENVIRO-SEAL
packing system, follow the procedures for valves
with the ENVIRO-SEAL packing system in this
section. Install the replacement packing following the
instructions in the packing system instruction manual
(D101643X012).
Stopping Leakage
For valves with PTFE or graphite packing:
CAUTION
Tighten the packing flange only
enough to prevent shaft leakage.
Excessive tightening will only
accelerate wear of the packing and
could produce higher torques on the
valve.
Leakage around the packing followers can be
stopped by tightening the packing flange nuts
(key 28, figure 10).
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