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KEYSTONE FIGURE 221/222 BUTTERFLY VALVES
INSTALLATION AND MAINTENANCE INSTRUCTIONS
INSTALLATION INSTRUCTIONS
Installation in pipeline
Figure 221/222 valves are bi-directional and
there is no need to identify upstream and
down stream orientation. These valves can be
installed in vertical or horizontal pipelines and
any intermediate orientation.
There is no restriction on the valve stem
position (vertical, horizontal or oblique),
although for slurry service and media, which
have a tendency to deposit sediment, the
recommended installation position is with
the stem horizontal and the lower disc edge
opening downstream.
Do not use flange gaskets or sealing
compounds. The Keystone seat face design
eliminates the need for gaskets.
MAINTENANCE
Routine maintenance or lubrication are not
required.
INSTALLATION IN AN EXISTING SYSTEM
1. Consideration should be given to the
location of the valves in the piping
system. The valve should not be placed
too close to other valves, elbows, etc.
as its performance may be affected.
It is recommended that the valve have a
minimum of six pipe diameters upstream
and four pipe diameters downstream
between it and other valves, elbows, etc.
in the piping system.
2. Ensure that the flanges are clean,
undamaged and compatible with the valve.
3. Check that the gap between the flanges
can accommodate the valve face to face
dimension.
4. Spread the flanges using suitable tooling
such as flange spreaders to enable ease of
insertion of the valve between the flanges.
WARNING
Do not use the valve as a lever.
5. Open the valve until the disc is free of
the seat but still within the valve body
(about 5° open).
6. Loosely insert two or more flange bolts
through the holes in the lower part of the
flanges to help support the valve.
7. Carefully slide the valve between the
flanges, center the valve body with the
pipeline axis, and insert the remaining
flange bolts.
8. Open the valve fully, checking that the disc
edge does not interfere with the pipeline
bore.
9. Remove any flange spreaders that
have been used and at the same time
tighten the flange bolts "hand tight".
Ensure that the valve remains centered
to the pipeline axis by slowly closing the
valve (clockwise rotation of the disc stem)
to check that adequate clearance has been
maintained between the disc edge and the
pipeline bore.
10. Re-open the valve (counter clockwise
rotation of the disc stem) and tighten all
flange bolts as per flange standards using
the diagonal sequence method.
11. Operate the valve to the desired position.
Flow
Open
Preferred mounting
EXISTING SYSTEM
1. Spread the flanges with the adequate
tooling. Insert some flange bolts to bear
the valve
2. Open the valve and remove the flange
spreads.
3. Close the valve clockwise, return to open
position and cross-tighten all bolting.
2
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