Keystone Figure 55 Butterfly Valve

Double flanged valve design for services in the water treatment industry.

Specifications:

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.
• Flat facing for GRP flanges as option.