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Keystone Series GRW/GRL Butterfly Valves (ISO)

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

Keystone Water treatment

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Bernhard Witzelsteiner
Account Manager
Phone. +46 70 378 83 35

Fredrik Malmström
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Phone. +46 40-33 02 33

Johan Riedenlow
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Anders Praem
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Slawka Pedersen
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Joonas Jägerroos
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Tommi Penttilä
Sales Manager Isolation Valves
Phone. +358 207 416 208

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.