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Keystone Series GR Butterfly Valves

Resilient seated configuration offering maximum flow area and drop-tight shutoff across multiple body styles.

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.

Caratteristiche principali

  • 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/ NPS 12).
  • 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.
  • Top and bottom shaft bearings for optimized support and minimum friction and decreased torque.
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