The Keystone Figure 221/222 series comprises rubber-lined butterfly valves designed for installation between ANSI Class 125/150 flat or raised faced flanges. These valves have a maximum working pressure of 16 bar and operate within a temperature range of -29°C to +120°C, contingent upon the seat material. The valves utilize a molded seat design. Proper installation and adherence to safety guidelines are crucial for optimal performance and longevity. This article details installation procedures, safety precautions, and pipeline design considerations based on provided documentation.
Valve Specifications and Operating Limits
The Keystone Figure 221/222 butterfly valve is engineered for specific operational parameters. The maximum working pressure is 16 bar. The acceptable temperature range extends from -29°C to +120°C; however, the specific seat material dictates the precise temperature limitations. The valve incorporates a molded seat design. Detailed technical data sheets, referenced in the documentation, provide specific pressure/temperature limits for different seat materials and valve configurations. Application pressure and temperature must remain within these specified limits.
Flange and Pipeline Compatibility
These butterfly valves are designed for compatibility with ANSI Class 125/150 flat or raised faced flanges. The documentation explicitly states that gaskets are not required when installing the valve between compatible flanges. When integrating the valve into a pipeline, it is essential to ensure sufficient internal diameter clearance at the valve body face to accommodate the disc sealing edge during valve operation. Lined pipe, heavy wall pipe, or flanges must meet this minimum clearance requirement. Weld neck flanges, where the flange ID closely approximates the flange bore, are recommended for maximizing valve performance. Slip-on flanges are also permissible for use.
Installation Procedures and Safety Precautions
Prior to installation, personnel must thoroughly read and understand all provided instructions. Installation should only be performed by properly qualified personnel. Before commencing any work on the valve or associated pipeline, it is imperative to fully drain or vent the pipeline. Appropriate personal protective equipment (PPE), including goggles, safety shoes, and industrial gloves, must be worn during the installation process.
The documentation emphasizes several critical safety considerations:
- Disregarding instructions can lead to improper operation and potential hazards.
- Improper use of the product may compromise its integrity and safety.
- Utilizing insufficiently qualified personnel can result in installation errors and safety risks.
- The product is not intended for use in areas where external fire is a potential hazard.
Pipeline Design Considerations
Effective pipeline design is integral to the safe and reliable operation of the Keystone Figure 221/222 valve. Several factors must be accounted for during the design phase:
- Valve Weights: The documentation stresses the importance of considering valve weights, as specified in the technical data sheet, when designing the supporting pipeline structure.
- Condensate Formation: In gas pipelines, the potential for condensate formation must be addressed in the design to prevent operational issues.
- Turbulence and Vortex Potential: The piping design should minimize turbulence and the potential for vortex formation at the valve location.
- Pipeline Vibrations: Pipeline vibrations can affect valve performance and longevity; the design should mitigate these effects.
- Water Hammer: The piping design should preclude the occurrence of water hammer at the valve to prevent damage.
The valve design does not account for earthquake loading or traffic vibration. These external factors must be considered separately during the overall system design if applicable.
Welding Precautions
The documentation provides a firm warning against welding near the valve. Welding in close proximity to the valve will cause serious damage to its components and compromise its functionality. This is due to the heat generated during the welding process affecting the valve’s internal materials and potentially damaging the rubber lining.
Seeking Guidance and Contact Information
If any doubt exists regarding any aspect of the Keystone Figure 221/222 valves, the documentation directs users to contact their local Emerson sales office for guidance. This ensures that any uncertainties are addressed by qualified professionals before proceeding with installation or operation.
Conclusion
The Keystone Figure 221/222 butterfly valve is a component designed for specific industrial applications. Successful implementation relies on strict adherence to installation instructions, comprehensive safety protocols, and careful consideration of pipeline design factors. Proper attention to these details ensures optimal valve performance, longevity, and safe operation within the specified pressure and temperature limits. Qualified personnel, appropriate PPE, and a thorough understanding of the provided documentation are essential for a successful installation.