Keystone K-LOK® Series 36/37 High Performance Butterfly Valves

  • Keystone K-LOK® Series 36/37 high performance butterfly valves are rated to ASME Class 150 and 300, available in wafer, lugged and flanged style.
  • The unique design does not rely on pressure to assist sealing and therefore seals at high and low pressures, as well as dirty services.
  • K-LOK® polymer and elastomer seats provide bi-directional, drop-tight shut-off in vacuum as well as at full rated differential pressure. Its unique design does not rely on pressure to assist sealing therefore seals at high and low pressures, as well as dirty services. A variety of materials allows optimum seat life in all applications.
  • Blow-out resistant shaft is standard on all valves for increased safety.
  • Unique packing design allows for use in pressure as well as vacuum without modification or special assembly.
  • Disc taper pins are tangentially positioned half in disc and half in shaft, placing them in compression rather than shear, which eliminates potential for failure.
  • Rocker-shaped gland bridge compensates for uneven adjustment of gland nuts reducing packing leaks.
  • Integrally cast disc position stop perfectly locates the disc in seat, achieving maximum seat and seal life.
  • Extended neck allows for 50 mm of pipeline insulation.
  • Integrally cast mounting pad provides direct mounting of actuators eliminating the need for costly brackets and couplings.
  • Flattened body bore at shaft journal ports positions shaft bearings near disc, providing maximum shaft support resulting in reduced wear and longer life.
Size RangeNPS 2 – 36 (DN 50 – 900)
Temperature Rating-40°F to 1000°F (-40°C to 538°C)
Pressure RatingASME Class 150 – 300
Material316 Stainless Steel, 316L Stainless Steel, Carbon Steel, Duplex, Stainless Steel, Super Duplex
Pressure ClassASME
Process Connection Type150RF, 300RF
Seat/Seal TypeHigh Performance
Shutoff ClassZero Leakage
StandardsAPI 609, ASME B16.34
Valve SizePS 10 / DN 250, NPS 12 / DN 300, NPS 14 / DN 350, NPS 16 / DN 400, NPS 18 / DN 450, NPS 2 / DN 50, NPS 20 / DN 500, NPS 2-1/2 / DN 65, NPS 24 / DN 600, NPS 3 / DN 80, NPS 4 / DN 100, NPS 6 / DN 150
Valve Size StandardNPS
Valve TypeButterfly, High performance Butterfly Valve
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