KEYSTONE FIGURE 129/239 BUTTERFLY VALVE
• Replaceable, metal-reinforced seat, completely encapsulated by rubber, isolates
the stem and body from the media and eliminates seat distortion due to high vac-
uum or turbulence.
• Primary stem seal, formed by preloaded contact of disc hub with flatted seat sur- faces, completely isolates stem and body from the line media.
• Secondary stem seal, formed by an engineered interference fit of the stem through the seat, provides additional sealing integrity.
• Rounded, polished disc edge provides full 360 degree concentric seating, minimum flow restriction, lower seating and unseating torques and maximum seat life.
A complete butterfly valve line to provide optimal performance.
Emerson’s Keystone portfolio offers a complete range of butterfly valves from general purpose through to heavy duty and high performance models. With a tradition of more than 70 years, Keystone has built its reputation on providing industrial process butterfly valves known for their reliability, long service life and reduced operating costs.
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