Keystone Double Eccentric Butterfly Control Valve with Split-Body Design for Bubble-Tight Shutoff and High Flow Capacity

The Keystone Figure 990 is a resilient seated, wafer-style butterfly valve with a split-body design. It features a thin-profile one-piece disc/stem that minimizes flow obstruction, delivering high flow capacity, low pressure drop, and excellent modulating performance. This valve is optimized for general industrial service where reliable bubble-tight shutoff and easy maintenance are important.

• One-piece thin-profile disc/stem for maximum flow and best control characteristics.
• Triple-function resilient seat isolates body and stem from media, provides bubble-tight shutoff, and seals against flanges (no separate gaskets needed).
• Split-body design allows easy seat and disc/stem replacement without removing the valve from the line.
• Wafer style for installation between ASME 125/150 or PN10/PN16 flanges.
• Available with elastomer or PTFE seats for different media compatibility.
• Corrosion and abrasion resistant options through material selections.

Suitable for water treatment, HVAC, food and beverage, chemical processing, and general industrial pipelines requiring high flow capacity and reliable modulating or on/off service.

Our team is ready to help with sizing, material selection, or actuator pairing. Reach out for your specific application needs.

Consider the Keystone Figure 920 lugged version for dead-end service, or pair with Keystone F79U pneumatic actuators for automated control.

The Keystone Figure 990 wafer butterfly valve features a split-body, thin-disc design engineered for high flow and modulating service. Its resilient seat and one-piece disc/stem construction deliver reliable bubble-tight shutoff and outstanding flow performance in a compact wafer body suitable for standard flange installations.

• Split-body construction for convenient in-line maintenance.
• One-piece disc/stem with thin profile for minimal flow restriction and high Cv.
• Resilient seat provides bubble-tight shutoff at full rating and flange sealing.
• Field-replaceable seat and disc/stem components.
• Available in a wide range of seat and body materials for broad media compatibility.
• Suitable for both on/off and modulating control applications.

Ideal for HVAC systems, water distribution, wastewater treatment, light chemical service, food processing, and other general industrial applications requiring cost-effective, high-flow butterfly valves with good modulating capability.

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