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Keystone Figure 310/312 High Performance Butterfly Valve
Figure 310/312 High Performance Butterfly Valve
High performance applications such as steam, chill water, water, utility lines, gasoline, natural gas, air, oil, jet fuels and process lines.
Keystone Figure 310/312 High Performance Butterfly Valve


End Connection
Wafer, Lugged
Air Circulation, Air Cooled Heat Exchangers, Facilities & Process Utilities, Plant Air, Balance of Plant
316 Stainless Steel, Carbon Steel
Operating Temperature
Less Than 400 F (204 C)
Pressure Class
Process Connection Type
Seat/Seal Type
High performance
Shutoff Class
Zero Leakage
ASME B16.34, API 609
Valve Size
NPS 4 / DN 100, NPS 6 / DN 150, NPS 8 / DN 200, NPS 3 / DN 80, NPS 2-1/2 / DN 65, NPS 12 / DN 300, NPS 2 / DN 50, NPS 10 / DN 250
Valve Size Standard
Valve Type
Water, Vacuum, Liquids, Air
Adjustable packing


  • Uninterrupted gasket surfaces help eliminate problems associated with seat retaining screws in the gasket surface and allows use of standard spiral wound gaskets.
  • Unique interference seat design with energized elastomer O-ring allows bi-directional ANSI Class VI shut-off at lower pressures. The seat is further energized by line pressure, providing the same tight bi-directional shut-off at full-rated pressure.
  • Heavy duty circular key holds the seat and retaining ring in place, providing bi-directional, dead-end service at full-rated pressure. This helps eliminate the need for easily corroded and hard-to-remove retention screws.
  • Valve stem designed to API 609 standards is blow-out resistant.
  • Seat retaining ring is housed within the flange gasket ID to eliminate potential emission path.
  • Face-to-face conforms to MSS SP-68 and can be configured to ISO 5752 short.
  • Adjustable packing utilizes unique rocker-shaped gland bridge that compensates for uneven adjustment of gland nuts.
  • Extended neck allows for two inches of clearance for insulation.