Keystone Figure 129/139 Resilient Seated Butterfly Valve0 pages

Keystone Butterfly Valve Figures 129 and 139
Sizes 2" to 20" [50 to 500 mm], 200 psi

VALVES & CONTROLS

Resilient Seated Butterfly Valve
Heavy Duty Cartridge Seat Design

Features and Benefits

• Primary stem seal, formed by
preloaded contact of disc hub with
flatted seat surfaces, completely
isolates stem and body from the line
media.
• Secondary stem seal, formed by an
engineered interference fit of the stem
through the seat, provides additional
sealing integrity.
• Rounded, polished disc edge
provides full 360 degree concentric
seating, minimum flow restriction,
lower seating and unseating torques
and maximum seat life.
• Superior, one-piece thru-shaft
design provides high-strength and
positive disc control. Shaft ends
are standardized for operator
interchangeability.
• Self-locking disc screws allow quick
and easy disassembly and provide a
positive connection.
• Self-adjusting, bi-directional stem seal
is suitable for full industrial vacuum
and pressure, preventing external
contamination of the stem area.
• Heavy-duty, corrosion-resistant top
bushing absorbs actuator side thrust
loads.
• Replaceable, metal-reinforced seat,
completely encapsulated by rubber,
isolates the stem and body from the
media and eliminates seat distortion
due to high vacuum or turbulence.
• Each valve is factory tested to 110
percent of specified pressure rating
assures drop-tight shut-off.
• Cast-in top plate is an integral part of
the body and is standardized to allow
direct mounting of all Keystone
actuators.

www.pentair.com/valves

General Application

Figures 129 and 139 are heavy duty,
resilient seated butterfly valves that are
ideally suited for seawater service within
the commercial marine and offshore
markets.

Technical Data
Pressure Rating:

200 psi

Sizes:

2 to 20 inch
[50 to 500 mm]

Temperature:

-40°F to 250°F
[-40°C to 120°C]

Flange Accommodations:
ASME 125/150
JIS 10K/16K
KS 10K/16K
AS 2129E

© 2013 Pentair Ltd. All rights reserved.

KEYMC-0475-US-1103