Keystone Series GRW/GRL Butterfly Valves (ISO)

Keystone Series GRW/GRL Butterfly Valves (ISO)

Keystone™ series GRW/GRL is a heavy duty industrial resilient seated butterfly valve.

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Tommi Penttilä
Sales Manager Conventional Power
Phone. 0207 416 208

Certifications ABS, PED, DVWG, CUTR, CRN
End Connection Lugged, Wafer
Application Cruise Ship, Cooling Water , Compressors , Air Circulation, Facilities & Process Utilities
Material Super Duplex, 316 Stainless Steel, Aluminum Bronze, Buna-N, Ductile Iron, Duplex, Epdm Rubber, Nylon 
Operating Temperature Less than 150 C
Pressure Class PN, ASME
Process Connection Type 150RF, PN16
Seat/Seal Type Resilient
Shutoff Class Zero Leakage
Standards ASME B16.34, API 609
Valve Size 5 inch, NPS 10 / DN 250, NPS 12 / DN 300, NPS 14 / DN 350, 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 30, NPS 36, NPS 4 / DN 100, NPS 6 / DN 150, NPS 8 / DN 200, NPS 16 / DN 400
Valve Size Standard DN, NPS
Valve Type Butterfly
Media Water Glycol, Water, Liquid, Air
Stem O-ring
  • 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).
  • 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.
  • Actuator flange according to ISO 5211.

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