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Keystone Series GRF (ISO) Butterfly Valves

Keystone™ series GRF is a heavy duty double flanged concentric design resilient seated butterfly valve.

CRYOGENIC & LNG Keystone WATER & SEVAGE

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Certifications	SIL capable, PED, DVWG, CUTR, CRN, ABS
Application	Cooling Towers, Air Circulation, Cooling Water , Facilities & Process Utilities, Desalination
Body Design	Short Pattern
Material	Duplex, Epdm Rubber, Ductile Iron, Carbon Steel, Buna-N, Aluminum Bronze, 316L Stainless Steel, 316 Stainless Steel, 304 Stainless Steel, Super Duplex
Operating Temperature	Less than 150 C
Pressure Class	PN, ASME
Process Connection Type	150FF, 150RF
Seat/Seal Type	Resilient
Shutoff Class	Zero Leakage
Standards	API 609, ASME B16.34
Valve Size	NPS 36, NPS 24 / DN 600, NPS 40, NPS 30, NPS 42, NPS 60, NPS 56, NPS 48, NPS 44
Valve Size Standard	DN, NPS
Valve Type	Butterfly
Media	Water Glycol, Water, Liquid, Air, Inert Gas, Air

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.
Actuator flange according to ISO 5211.
Top and bottom shaft bearings for optimized support and minimum friction and decreased torque.
Top bushing absorbs actuator side thrust loads.