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Keystone Butterfly Valve Figures 129 & 139

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Figure 129 and Figure 139 are heavy-duty, resilient-seated butterfly valves that are ideally suited for many industrial high-performance applications, such as air, water, and vacuum service. In addition, Figures 129 and 139 can also be used for marine and naval use where MIL-V-22133C specified valves are required.



Sizes 2-20 inch
Pressure ratings 200 psi
Temperature range -40 °F to 250 °F
Standards API 609, ASME B16.34
Body Cast iron, Ductile iron, Nickel aluminum bronze
Disc Ductile iron, Aluminum bronze, 316 Stainless Steel, Monel®




  • Replaceable, metal-reinforced seat, completely encapsulated by rubber, isolates the stem and body from the media and eliminates seat deformation due to high vacuum or turbulence.
  • Self-adjusting, bi-directional stem seal is ideal for full industrial vacuum and pressure, preventing external contamination of the stem area.
  • Heavy-duty, corrosion-resistant top bushing absorbs all actuator side thrust loads.
  • Primary stem seal, formed by preloaded contact of disc hub with flatted seat surfaces, completely isolates stem and body from the line media.
  • Secondary stem seal, crafted by an engineered interference fit of the stem through the seat, providing additional sealing integrity.
  • Self-locking, stainless steel disc screws allow for quick deconstruction, while also providing a solid connection.
  • ABS Type Approved

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