Back To Top
Keystone Series GR Butterfly Valves
Keystone Series GR general purpose resilient seated butterfly valves are available in flanged, lugged or wafer body style for any service where drop-tight shut-off and maximum flow area is required.
Keystone Series GR Butterfly Valves

Specs

Sizes:
DN 50 - 900 (NPS 2 - 36)
Pressure:
16 bar DN 50 - 300 (230 psi NPS 2 - 12)
10 bar DN 350 - 900 (150 psi NPS 14 - 36)
Reinforced seat:
16 bar DN 350 - 600 (230 psi NPS 14 - 24)
End of line:
10 bar DN 50 - 300 (150 psi NPS 2 - 12)
6 bar DN 350 - 900 (90 psi NPS 14 - 36)
Reinforced seat:
10 bar DN 350 - 600 (150 psi NPS 14 - 24)
Vacuum service:
0.4 bar (5.8 psia)
Temperature:
`-40°C to +160°C (-40 °F to +320°F)
Flange accommodation:
PN 6/10/16, 125/150, JIS 10K, BS Table E, AS4087 PN 16, AS2129 Table E

Features

  • 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 the shaft area to the 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.

Education

Interested in attending a training class?

Visit our Education Course Listing.