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A11 Valve
1. To mount an actuator without travel stops, first, if
necessary, remove the actuator from the valve.
Then, position the valve disc from 0 to 0.76 mm (0 to
0.030 inch) away from the internal stop in the valve
body.
2. Now, travel the actuator to the maximum position.
Keep the actuator in the maximum travel position.
Return the actuator to the valve, taking care not to
disturb the position of the valve disc.
3. Mount the actuator on the valve using proper
bolts with locking washers to achieve a secure fit.
4. Before installing the valve/actuator assembly in
the process line, cycle the valve several times to be
sure the valve disc returns to the proper position.
Preparing for Installation
WARNING
If the Type A11 valve is equipped with
a fail-open actuator, remove the
actuator before installing the
valve/actuator assembly or cycle the
valve into the fully closed position.
Then, to avoid possible personal injury
or property damage, take appropriate
steps to ensure that the actuator does
not cause the valve to open during
installation.
1. If the valve and actuator have been purchased
separately or if the actuator has been removed for
storage, travel stop adjustment, or maintenance,
mount the actuator before inserting the
valve/actuator assembly into the line. Refer to the
actuator instruction manual for mounting and
adjustment procedures.
CAUTION
To avoid product damage, inspect the
valve before installation for any
damage or any foreign material that
may have collected in the valve body.
Also remove any pipe scale, welding
slag, or other foreign material from the
pipeline.
2. Remove the protective end covers from the valve
and inspect the valve body to be certain that it is free
of foreign material. Also, be certain that adjacent
pipelines are free of any foreign material, such as
4
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pipe scale or welding slag that could damage the
valve seating surfaces.
WARNING
The Type A11 valve is designed for
use with the appropriate piping
schedule for the ASME class.
However, before putting the valve into
operation, measure carefully to ensure
disc rotation without interference from
piping or flanges. Be certain to center
the valve accurately to prevent
interference of the disc with the
flanges.
D The edges of a rotating disc have
a shearing effect that may result in
personal injury. To help prevent such
injuries, stay clear of the disc edges
when rotating the disc.
D 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 putting the
valve into operation.
3. Select the appropriate gaskets for the application.
flexible graphite, spiral wound, or other gasket types,
made to ASME B16.5 group or user's standard, can
be used on Type A11 valves depending on the
service conditions of the application. Note: spiral
wound gaskets, when properly centered, will cover
more than 60 percent of the gasket area at the
retaining ring screws.
For metal-seated and cryogenic valve gasket
recommendations, please contact your Emerson
Process Management sales office.
4. Refer to the appropriate table for the quantity and
size of flange bolts required (table 4 or 5) and
proceed with the following instructions.
Valve Orientation
Type A11 valve bodies are designed for installation
with the shaft in any orientation around the pipeline:
horizontal, vertical, or at an angle. However, when
installing a Type A11 valve, please follow these
recommendations.
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