The Keystone Figure 990/920 Butterfly Valve is designed to provide optimal performance in a wide range of industrial applications. Its one-piece, thin profile disc stem is engineered to minimize flow obstruction, ensuring maximum Cv, reduced pressure drops, and enhanced control characteristics. The rounded, polished disc edge contributes to a full concentric sealing, offering lower operating torques, extended seat life, and reliable tight shut-off capabilities. This design ensures high efficiency while maintaining longevity in demanding environments.

A key feature of this valve is its triple-function resilient seat, which not only isolates the body and stem from the line media but also guarantees drop-tight shut-off at full-rated pressure. This seat also delivers positive flange sealing, eliminating the need for additional flange gaskets. This multi-functional seat design enhances overall operational reliability while reducing maintenance complexities. Further contributing to durability, the valve is equipped with a heavy-duty, corrosion-resistant top bushing, providing upper stem support and absorbing actuator sideloading, extending the overall valve cycle life.