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Keystone Series GRW/GRL Butterfly Valves
Series GRW/GRL Butterfly Valves
A heavy duty industrial resilient seated Butterfly valveGRW - Wafer body designGRL - Lugged body design
Keystone Series GRW/GRL Butterfly Valves


ABS, CRN, CUTR, PED, SIL capable
End Connection
Lugged, Wafer
Air Circulation, Balance of Plant, Bulk Storage, Bulk Conversion Other, Compressors , Conveyors, Cooling Water , Cruise Ship, Facilities & Process Utilities, Blowers
Ductile Iron, Duplex, Epdm Rubber, Monel, Nylon, Super Duplex, 316L Stainless Steel, 316 Stainless Steel, 304 Stainless Steel, Buna-N, Aluminum Bronze
Operating Temperature
Less than 150 C
Pressure Class
Process Connection Type
150RF, PN16
Seat/Seal Type
Shutoff Class
Zero Leakage
API 609, ASME B16.34
Valve Size
NPS 18 / DN 450, NPS 20 / DN 500, NPS 2-1/2 / DN 65, NPS 24 / DN 600, NPS 3 / DN 80, NPS 14 / DN 350, NPS 12 / DN 300, NPS 6 / DN 150, NPS 8 / DN 200, NPS 16 / DN 400, NPS 4 / DN 100, NPS 10 / DN 250
Valve Size Standard
Valve Type
Vacuum, Water, Air, Fuel Oil, Hot Water, Liquids


  • Wafer and lugged body design with face-to-face dimension, according to EN 558 Series 20 and API 609.
  • 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.
  • The two piece shaft allows for a thin disc and provides minimal obstruction to flow (up to DN 300/ NPS 12).
  • Rounded polished disc edge gives full concentric sealing, lower torques, longer seat life and drop-tight shut-off.
  • Body locating holes allow ease of installation and centering between the flanges.
  • Extended body neck allows for pipe insulation.
  • Top and bottom shaft bearings for optimized support and minimum friction and decreased torque.


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