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Keystone Series GR Butterfly Valves
Keystone Series GR Resilient Seated Butterfly Valves-FAMILY
Keystone Series GR Resilient Seated Butterfly Valves-FAMILY
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.