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Keystone Series HiLok High Performance Butterfly Valves
Series HiLok Butterfly Valves
The HiLok high performance Butterfly valves offer efficient, bidirectional sealing
Keystone Series HiLok High Performance Butterfly Valves


SIL capable, PED, CUTR
End Connection
Lugged, Wafer
Metals Processing, Fuel Gas, Facilities & Process Utilities, Blowers, Biofuels, Air Circulation
Duplex, Carbon Steel, 316 Stainless Steel
Pressure Class
Process Connection Type
PN25, PN16
Seat/Seal Type
High performance
Shutoff Class
Zero Leakage
Valve Size
NPS 20 / DN 500, NPS 18 / DN 450, NPS 16 / DN 400, NPS 14 / DN 350, NPS 12 / DN 300, NPS 10 / DN 250
Valve Size Standard
Valve Type
Air, Air, Inert Gas, Ammonia, Fuel Oil, Hot Water, Liquids, Specialty Gases, Natural Gas, Water, Vacuum, Steam, Oxygen
Live loaded, Adjustable packing


  • Cast on ISO top plate.
  • Long neck for insulation service.
  • External travel stop, outside of the medium area.
  • Accessible packing adjustment without operator removal.
  • Positive sealing which is mechanically achieved and does not rely on line pressure assistance.
  • Bidirectional shut-off performance.
  • Available in soft, fire-safe and metal seated.
  • Long life durability due to double offset operating principle minimizing seat wear.
  • Two piece shaft for maximum flow and minimum headloss.
  • Quadruple shaft bearings to ensure stability during high pressure, high cycle applications.
  • Fast and simple seat replacement.
  • Uninterrupted gasket surface.