Keystone Optiseal Resilient Seated Butterfly Valve
The Keystone Optiseal Resilient Seated Butterfly Valve is a high-reliability, cost-effective flow control solution engineered for versatile shutoff and regulation tasks. With a fully encapsulated resilient liner, it ensures excellent sealing, corrosion resistance, and long service life, even in aggressive or abrasive media. Its centric disc design enables bidirectional bubble-tight shutoff, making it suitable for liquids, gases, and slurries. Lightweight, easy to install, and compatible with various actuator types, the Optiseal valve is ideal for water treatment, HVAC, chemical processing, food and beverage, and general industrial applications.
The Keystone Optiseal Resilient Seated Butterfly Valve is a highly reliable and cost-effective solution designed for general-purpose flow regulation and shutoff applications. Featuring a robust, fully encapsulated resilient liner, this valve offers exceptional sealing performance, corrosion resistance, and extended service life, even when exposed to chemically aggressive or abrasive media. Its centric disc and seat design allows for bubble-tight shutoff in both directions, whether handling liquids, gases, or slurries. Manufactured by Keystone (an Emerson brand), the Optiseal valve combines high-performance engineering with simplified maintenance, making it a preferred choice in water treatment, HVAC, chemical processing, food and beverage, and general industrial applications. The lightweight construction enables easy installation, while the self-centering features ensure accurate alignment and leak-free operation. Available with manual, pneumatic, electric, or hydraulic actuation, the Keystone Optiseal offers exceptional versatility for both isolation and throttling processes.
Technical Specification of Keystone Optiseal Resilient Seated Butterfly Valve
- Certifications
- CUTR, SIL capable, PED
- End Connection
- Wafer, Lugged
- Application
- Winemaking, Beverages, Automotive, Air Circulation
- Material
- Super Duplex, Hastelloy, Epdm Rubber, Duplex, Cast Iron, Carbon Steel, Buna-N, 316L Stainless Steel, 316 Stainless Steel
- Operating Temperature
- Up to 250 F (120 C)
- Pressure Class
- PN
- Process Connection Type
- PN16
- Seat/Seal Type
- Resilient
- Shutoff Class
- Zero Leakage
- Valve Size
- NPS 10 / DN 250, NPS 8 / DN 200, NPS 6 / DN 150, NPS 4 / DN 100, NPS 3 / DN 80, NPS 2-1/2 / DN 65, NPS 1-1/2 / DN 40
- Valve Size Standard
- DN
- Valve Type
- Butterfly
- Media
- Liquids, Water, Hot Water, Liquid, Air
- Stem
- O-ring
Feature of Keystone Optiseal Resilient Seated Butterfly Valve
- Top bushing absorbs actuator side thrust loads.
- Actuator flange acc. ISO 5211.
- High solid, glossy, silicone free, paint system ensuring excellent corrosion resistance.
- Extended body neck allows pipe insulation.
- Body locating holes ease installation and centering between the flanges.
- Rounded polished disc edge gives full concentric sealing, lower torques, longer seat life and bubble-tight shut-off.
- The seat is field replaceable and fully isolates the body and stem from the flow.
- Primary stem sealing exceeds the pressure rating of the valve and prevents leakage through shaft area to atmosphere.
- A secondary shaft sealing provides back‑up safety.
- No flange gaskets required.
- High Cv value.
- Top and bottom shaft bearings for optimized support and minimum friction in all body materials up to DN 300, except cast iron.