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Keystone Figure 310/312 High Performance Butterfly Valve
Figure 310/312 High Performance Butterfly Valve
This Keystone valve is suited for high performance applications such as steam, chill water, water, utility lines, gasoline, natural gas, air, oil, jet fuels and process lines.
Featuring an uninterrupted gasket surface, unique interference seat design, heavy-duty circular key, and more, you can depend on the reliability and durability of Keystone valves.
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


  • This Keystone Valve features uninterrupted gasket surfaces to 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.
  • This Keystone Valve features a 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.


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