Welflex butterfly valves double eccentric HP
Both polymers and elastomers have temperature and pressure limitations. When the application has a higher temperature and/or pressure than these materials allow, a metal seat offers a solution. However, a metal or hybrid seal requires a modified valve design to prevent friction between the valve blade and seat. For this reason, the double eccentric valve design was developed.
This design allows the valve blade to close with lower friction in the seat, allowing a metal seat to be used. These valves are also called high performance butterfly valves.
Specifications
- Range: DN50 to DN2000
- Pressure: 0 barg to 40 barg (PN10-40 and 150lbs.-300lbs.)
- Temperature: -50⁰C to 450⁰C
- Design: 1 piece or 2 piece house
- Density: bi-directional density, (EN 12266-A or B)
- Housing material: cast iron, steel, stainless steel
- Material seal: 316 stainless steel, Inconel or other metals
- Exotic materials possible: yes
- Available with lever, hand wheel, pneumatic drive and electric drive
Application
When the operating temperature exceeds 230⁰C, elastomers and polymers are no longer suitable for use. Also, these relatively soft materials are unsuitable for abrasive media leading to rapid seal wear. Finally, elastomers and polymers have operational pressure limitations.
When one or more of the above situations occur then a metal seal or a combination of a metal and a non-metal seal (hybrid form) is recommended. A metal is more wear resistant and is suitable for higher temperatures and pressures.
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Additional Information
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