Back To Top
Keystone Series GRF Butterfly Valves
Series GRF Butterfly Valves
A heavy duty double flanged concentric design resilient seated Butterfly valve
Keystone Series GRF Butterfly Valves


ABS, American Bureau of Shipping Shipboard, PED
Wastewater collection, Water Treatment, Water distribution, Plant Air, Wastewater treatment, Chillers , Air Circulation
Body Design
Short Pattern
Ductile Iron, Epdm Rubber, Carbon Steel, Buna-N, 316 Stainless Steel
Operating Temperature
Up to 250 F (120 C)
Pressure Class
Process Connection Type
CL150RF, 150FF, 125FF
Seat/Seal Type
Shutoff Class
Zero Leakage
API 609, ASME B16.34
Valve Size
NPS 60, NPS 56, NPS 48, NPS 44, NPS 42, NPS 40, NPS 36, NPS 30, NPS 24 / DN 600
Valve Size Standard
Valve Type
Air, Inert Gas, Air, Hot Water, Liquid, Water, Liquids


  • Double flanged body design with face-to-face dimensions, according to EN 558 Series 20, API 609 and AWWA C504 short.
  • Designed according to EN 593 and API 609.
  • The seat is field replaceable and fully isolates the body and shaft from the flow.
  • Primary shaft sealing exceeds the pressure rating of the valve and prevents leakage through shaft area to atmosphere.
  • A secondary shaft sealing provides back-up safety.
  • A molded-in O-ring in the seat for flange sealing eliminates the need for gaskets.
  • Shaft seals prevent moisture penetrating into the shaft area.
  • Rounded polished disc edge gives full concentric sealing, lower torques, longer seat life and drop-tight shut-off.
  • Extended body neck allows for pipe insulation.
  • Top and bottom shaft bearings for optimized support and minimum friction and decreased torque.
  • Top bushing absorbs actuator side thrust loads.
  • All valves comply to Pressure Equipment Directive (97/23/EU) Module B1 + D, CE Marking.


Interesting in attending a training class?

Visit Course Listing!