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Keystone Figure 55 Butterfly Valve
Figure 55 Butterfly Valve
Double flanged valve design for services in the water treatment industry
Keystone Figure 55 Butterfly Valve

Specs

Certifications
PED
Application
Wastewater treatment, Air Circulation, Wastewater collection, Water distribution, Water Treatment
Body Design
Long Pattern, Short Pattern
Material
Buna-N, Cast Iron, Ductile Iron, Epdm Rubber
Operating Temperature
Up to 250 F (120 C)
Pressure Class
ASME, PN
Process Connection Type
CL150RF, PN16
Seat/Seal Type
Resilient
Shutoff Class
Zero Leakage
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
Media
Water, Liquids, Air, Inert Gas, Air
Stem
O-ring

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.

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