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Keystone Figure 129/239 Butterfly Valve
Figure 129/239 Butterfly Valve
Heavy duty lugged/wafer valve with steel reinforced cartridge design seat
Keystone Figure 129/239 Butterfly Valve


American Bureau of Shipping Shipboard, ABS
End Connection
Lugged, Wafer
Marine Docks, Vacuum Systems
Aluminum Bronze, Buna-N, 316L Stainless Steel, 316 Stainless Steel, Carbon Steel, Cast Iron, Epdm Rubber, Monel, Stainless Steel, Ductile Iron
Operating Temperature
Standard Temperature (-40 - 250F)
Pressure Class
Seat/Seal Type
Shutoff Class
Zero Leakage
API 609, ASME B16.34
Valve Size
NPS 18 / DN 450, NPS 6 / DN 150, NPS 4 / DN 100, NPS 3 / DN 80, NPS 2-1/2 / DN 65, NPS 20 / DN 500, NPS 16 / DN 400, NPS 8 / DN 200, NPS 14 / DN 350, NPS 12 / DN 300, NPS 10 / DN 250
Valve Size Standard
Valve Type
Air, Vacuum, Water


  • Replaceable, metal-reinforced seat, completely encapsulated by rubber, isolates the stem and body from the media and eliminates seat distortion due to high vacuum or turbulence.
  • 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, 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.
  • Superior, one-piece thru-shaft design provides high-strength and positive disc control. Shaft ends are standardized for operator interchangeability.
  • Self-locking disc screws allow quick and easy disassembly and provide a positive connection.
  • Self-adjusting, bi-directional stem seal is suitable for full industrial vacuum and pressure, preventing external contamination of the stem area.
  • Heavy-duty, corrosion-resistant top bushing absorbs actuator side thrust loads.
  • Each valve is factory tested to 110 percent of specified pressure rating assures drop-tight shut-off.
  • Cast-in top plate is an integral part of the body and is standardized to allow direct mounting of all Keystone actuators.