
8532 Valve
Instruction Manual
Form 5288
November 2007
5
DUse pressure-relieving devices as
required by government or accepted
industry codes and good engineering
practices to protect from
over-pressurizing the system.
DCheck with your process or safety
engineer for any other hazards that
may be present from exposure to
process media.
DIf installing into an existing
application, also refer to the WARNING
at the beginning of the Maintenance
section in this instruction manual.
CAUTION
When ordered, the valve configuration
and construction materials were
selected to meet particular pressure,
temperature, pressure drop, and
controlled fluid conditions.
Responsibility for the safety of
process media and compatibility of
valve materials with process media
rests solely with the purchaser and
end-user. Since some body/trim
material combinations are limited in
their pressure drop and temperature
ranges, do not apply any other
conditions to the valve without first
contacting your Emerson Process
Management sales office.
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, shut off all pressure
lines to the power actuator, release pressure from
the actuator, and disconnect the pressure lines from
the actuator. Use lock-out procedures to be sure that
the above measures stay in effect while you are
working on the equipment.
See the WARNING at the beginning of the
Maintenance section for more information before
removing the valve from the pipeline.
2. Install a three-valve bypass around the control
valve assembly if continuous operation is necessary
during inspection and maintenance of the valve.
3. Inspect the valve to be certain that it is free of
foreign material.
4. Be certain that adjacent pipelines are free of any
foreign material, such as pipe scale or welding slag,
that could damage the valve sealing surfaces.
CAUTION
Damage to the disc will occur if any
pipe flanges or piping connected to
the valve interfere with the disc
rotation path. If the piping flange has a
smaller inner diameter than specified
for schedule 80 piping, measure
carefully to be certain the disc rotates
without interference before placing the
valve into operation. Minimum inside
diameters for flanges or pipe mating
with valves are shown in tables 3
and 4.
Valve Orientation
The valve can be installed in any orientation,
however it is recommended that the valve drive shaft
be horizontal and the actuator vertical as shown in
figure 4.
Install the valve with the high-pressure shutoff side
in the direction noted by the flow arrow for proper
installation, and see figure 4 for more information.
Before Installing the Valve
WARNING
The edges of a rotating valve disc
(key 2, figure 9) close with a shearing,
cutting motion. To avoid personal
injury, keep hands, tools, and other
objects away from the disc while
stroking the valve.
If the Type 8532 valve is equipped with
a fail-open actuator, cycle the valve
into the fully closed position. Ensure
the valve cannot open during
installation by using travel stops, a
manual actuator, a constant supply
pressure to the pneumatic actuator, or
other steps as necessary.