Keystone GRW General Service Butterfly Valves


The Keystone Series GR is a heavy duty industrial resilient seated butterfly valve aimed at general purpose applications.

Used on water, air, dry bulk conveying etc. These valves are for any service where a drop-tight shut-off with maximum flow area is required.

Available as manual lever operated valves or actuated valves to your specification, fully assembled, tested and certified at our factory.

  • 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.
  • Top and bottom shaft bearings for optimized support and minimum friction and decreased torque.
  • Top bushing absorbs actuator side thrust loads.
  • All valves comply to Pressure Equipment Directive (2014/68/EU) Module B + D, CE Marking.
  • Available approvals: NSF/ANSI 61, ACS, KIWA, WRAS, DVGW-G, ABS, CU-TR.

Sizes: 20mm – 900mm
Pressure: 16 bar (20mm – 300mm), 10 bar (350mm – 900mm)
Reinforced seat: 16 bar (350mm – 600mm)
End of line: 10 bar (20mm – 300mm), 6 bar (350mm – 900mm)
Reinforced seat: 10 bar (350mm – 600mm)>
Vacuum service: 0.4 bar
Temperature: -28°C to +160°C
Flange accommodation: PN 6/10/16, ASME 125/150, JIS 10K, JIS 16K, BS Table E, AS4087 PN 16, AS2129 Table E

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Centerline RS General Service Butterfly Valves

A resilient seated butterfly valve with superior design features and materials of construction to provide repeatable tight shutoff in severe abrasive and corrosive environments for a variety of applications.

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T-Series - PTFE Sealed Firesafe Valve

  • Firesafe and non-Firesafe: Certified Firesafe to BS 6755 part 2 and BS EN ISO 10497.
  • Sizes: 3” (80mm) to 48” (1200mm)
  • Body styles: Double Flanged, Wafer Lugged, Wafer Flangeless
  • Geometry: Double offset giving low unseating and seating torques electroless nickel plated spherical blade periphery is an option.
  • Pressure ratings: ANSI 150#, 300#. PN 10, PN 16, PN 25. Others on request
  • Materials - Carbon Steel (ASTM A216 WCB), Stainless Steel (ASTM A351 CF8M), Duplex & Super Duplex stainless steels, 6Mo stainless steel, Aluminum Bronze, Monel,  Incoloy, Inconel, Hastelloy B&C, Titanium

The shaft is of one piece construction with an anti-blowout feature on the non-drive side and a reduced diameter at the actuator end. If failure of the shaft -to -disc connection, or internal failure of the shaft occurs due to excessive torque, no portion of the shaft can be ejected from the valve as result of internal pressure.

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