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Figure 55 Butterfly Valve

Brand: Keystone

Double flanged valve design for services in the water treatment industry.
Features
  • The centric disc offers bidirectional service and allows with its symmetric shape high Kv (Cv) values.
  • Dry shaft design.
  • The inside body is protected by a bonded rubber liner extending over the flanges.
  • Primary stem sealing by preloaded contact between flatted seat surface and rounded polished disc-hub area exceeds the pressure rating of the valve and prevents leakage through shaft area to atmosphere.
  • A secondary sealing is provided by the interference fit between shaft and shafthole in seat at all positions.
  • Dirtscraper prevents moisture penetrating into the shaft area.
  • Bubble-tight shut off at full pressure rating.
  • Rounded, polished disc edge provides concentric sealing.
  • Actuator flange acc. ISO 5211.
  • Double flanged body design per EN 558 series 13 (short), series 14 (long) on request.
  • Excellent performance in media with sedimentation and contamination.
  • Suitable for severe vacuum applications and up to 16 bar (230 psi) drop tight shut off.

Specifications

Brand

Applications

  • Wastewater Treatment, Air Circulation, Wastewater Collection, Water Distribution, Water Treatment

Approvals & Certifications

  • PED

Body Design

  • Long Pattern, Short Pattern

Material

  • Buna-N, Cast Iron, Ductile Iron, EPDM Rubber

Media

  • Water, Liquids, Air, Inert Gas, Air

Operating Temperature

  • Up to 250° F (120° C)

Pressure Class

  • ASME , PN

Process Connection Type

  • Class 150 RF, PN 16

Seat / Seal Type

  • Resilient

Shutoff Class

  • Zero Leakage

Stem

  • O-Ring

Valve Size

  • NPS 24 / DN 600, NPS 4 / DN 100, NPS 6 / DN 150, NPS 8 / DN 200, NPS 16 / DN 400, NPS 20 / DN 500, NPS 12 / DN 300, NPS 14 / DN 350, NPS 18 / DN 450

Valve Size Standard

  • DN, NPS

Valve Type

  • Butterfly

  • Waterwork Industries Where A Double Flanged Valve Is Required.
  • Fire Fighting Systems.
  • Sea Water Applications.
  • For Drinking Water Applications
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