Emerson.com/FinalControl
VCIOM-02878-EN 18/12
© 2017 Emerson. All Rights Reserved.
DANGEROUS PRACTICES
Potentially dangerous practices:
• disregarding instructions
• improper use of product
• use of insufficiently qualified personnel.
Application pressure/temperature must not be
higher than the pressure/temperature limits
shown on the technical data sheet.
Before installation these instructions must be fully read and understood
KEYSTONE
FIGURE 221/222 BUTTERFLY VALVES
INSTALLATION AND MAINTENANCE INSTRUCTIONS
INTRODUCTION
The Keystone Figure 221/222 is a rubber lined
butterfly valve which has a maximum working
pressure of 16 bar over a temperature range of
-29°C to +120°C, depending on seat material.
The Figure 221/222 utilizes a molded seat
design.
SAFETY RELATED INFORMATION
1. If in any doubt regarding any aspect of
Figure 221/222 valves, contact your local
Emerson sales office for guidance.
2. Only use properly qualified personnel for
installation.
3. Ensure that the pipeline is fully drained
or vented before removing the valve from
the pipeline.
4. Use appropriate protective equipment/
clothing, such as goggles, safety shoes,
industrial gloves.
5. This product is not intended for use in areas
where external fire is a potential hazard.
6. The piping design must take into account
the following factors and any other factors
which are not listed here, but known
to be relevant to the safe operation of
the installation.
6.1 Valve weights which are shown in
the technical data sheet.
6.2 Formation of condensate in gas
pipelines.
6.3 Elimination of turbulence and vortex
potential at the valve.
6.4 Pipeline vibrations.
6.5 The piping design should preclude
the occurrence of water hammer at
the valve.
7. The valve design has not taken into account
earthquake loading or traffic vibration.
8. The normal shelf life of the Figure 221/222
valve seat is 5 years under clean, dry
ambient and conditions without UV exposure
prior to installation.
9. Tighten all flange bolts as per the
nominated flange standards using the
diagonal sequence method.
FLANGE AND PIPELINE COMPATIBILITY
Keystone butterfly valves are designed for
installation between ANSI Class 125/150 flat or
raised faced flanges. Gaskets are not required.
Lined pipe, heavy wall pipe or flanges must
have a minimum allowable inside diameter at
the centered body face to clear the disc sealing
edge when opening the valve.
Weld neck flanges (flange ID approximates
flange bore) are recommended to ensure
maximum valve performance; however, slip-on
flanges may be used.
Do not weld near the valve, as this will result in
serious damage to the valve.
