Keystone Series GRW/GRL Butterfly Valves

Keystone Series GRW/GRL Butterfly Valves

Keystone™ series GRW/GRL is a heavy duty industrial resilient seated butterfly valve. GRW - Wafer body design. GRL - Lugged body design.

Any questions?

Anders Praem
Inside Sales Engineer
Phone. 2137 7759

Kenn Gerwien
Area Account Manager East
Phone. 2346 5513

Slawka Pedersen
Inside Sales Manager
Phone. 2137 7702

Certifications ABS, CRN, CUTR, PED, SIL capable
End Connection Lugged, Wafer
Application Air Circulation, Balance of Plant, Bulk Storage, Bulk Conversion Other, Compressors , Conveyors, Cooling Water, Cruise Ship, Facilities & Process Utilities, Blowers
Material 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 PN, ASME
Process Connection Type 150RF, PN16
Seat/Seal Type Resilient
Shutoff Class Zero Leakage
Standards 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 DN, NPS
Valve Type Butterfly
Media Air, Air, Inert Gas, Ammonia, Fuel Oil, Hot Water, Liquids, Specialty Gases, Natural Gas, Water, Vacuum, Steam, Oxygen
Stem Live loaded, Adjustable packing
  • 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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