Jamesbury Wafer-Sphere Butterfly Valve, Series 800
Jamesbury Wafer-Sphere high-performance butterfly valves combine unique off-center disc, proprietary seat design, and Xtreme sealing technology. Tight, long-lasting sealing, and yet light and low-cost design makes it a good alternative to gate valves and other heavier rotary-type designs.
Jamesbury™ brand valves have always been recognized leaders in valve technology. For nearly 50 years, our unique features have been field-proven to provide trouble-free shut-off in thousands of applications just like yours. This experience allows us to provide a butterfly valve that can lower your costs without risking performance.
Our Wafer-Sphere™ high- performance butterfly valve combines a special off-center disc with proprietary seat designs and revolutionary Xtreme™ sealing technology to provide you with the tightest-sealing, longest-lasting, lowest-cost alternative to gate valves, as well as to other heavier, rotary-type valves.
Since our cycle life is far greater than a traditional butterfly valve, Wafer-Sphere high-performance butterfly valves are often a more cost-effective solution even for applications without high-performance service demands. They are especially suited for applications in grain/corn processing, chemicals, petrochemicals, power, refining, steel, air separation, HVAC, and more.
Jamesbury Wafer-Sphere benefits over typical gate valves
• Flexible lip seats and eccentric discs resist erosion and wear.
• Total costs are comparatively lower as valve size increases.
• Simple tightening of the valve gland packing stops leakage.
• Actuators easily accept limit switches and positioners.
• Easy to automate and accessorize
Jamesbury Features
- Driveshaft with trunnion (Model D only) or through the shaft
- High flow capacity design (Model D)
- Robust engineering design
- Flexible lip seat technology
- Low emissions stem seal technology
- Fire-tested & cryogenic designs
- High cycle options
- High quality.
Jamesbury Valve Specifications
| Series | 800 series (Model D) | 800 series |
| Size range | 3″ – 12″ (excluding 5″) | 2 ½” – 60” |
| Design | Wafer, lug and double flanged | Wafer or lug |
| Maximum temperature | +260 °C / +500 °F | +260 °C / +500 °F |
| Pressure rating | ASME Class 150 – 300/ PN 10 – 40 | ASME Class 150, 300 & 600 |
| Materials | Carbon steel, Stainless steel, Monel | Carbon steel, Stainless steel, Monel, Hastelloy C |
Wafer-Sphere benefits over typical gate valves
- Significantly less weight.
- Higher pressure ratings.
- Compact design requires less space.
- Leaktight shut-off over long cycle life.
- Ease of automation.
- A multitude of applications.
- Ease of maintenance.
- Lower overall installed cost.
The Jamesbury high performance valve is a heartier concept than the rubber lined version. The term ‘high performance’ when considering the butterfly valve means the valve will take full ANSI pressure ratings, shuts off ‘bubble tight’, has higher temperature ratings and, through the use of design and materials, has a much higher cycle life (extending into the millions of cycles without failure or leakage).
To make a proper comparison, we need to understand the technology behind both. The rubber-lined butterfly valve bodies are typically cast iron or ductile iron. High-performance valves do have the option for ductile iron, but are primarily utilized with cast steel (or SS) bodies. The rubber-lined valves have a rubber-lined boot that acts as its seat. That boot is fitted and glued into the body of the valve. These rubber liners are sensitive to chemicals and have a shorter life expectancy (hardening and cracking over time). The high-performance butterfly valves utilize polymeric seats which have an infinite life expectancy and have a very high chemical resistance – very few chemicals are known to affect the fluorocarbon-based polymers which makes these products attractive to an industrial valve application. Jamesbury has a proprietary product called ‘Xtreme’ which is an engineered fluorocarbon that has received the Chemical Processing Magazine’s highest award, the ‘Vaaler Award’ for innovative products. Its qualities take the pressures, temperatures, and abrasion resistance beyond that of rubber or other fluorocarbon-based polymers. The attached table shows the extended life expectancy of the Xtreme seat in a high-performance butterfly valve. The rubber-lined products operate without leaks from the 1,000 – 5,000 cycle range. An extremely high-quality rubber liner may last up to 10,000 cycles.
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Reference: valmet.com
