Butterfly Valves
Butterfly valves include triple offset, double offset and resilient seated concentric designs complying with API 609. They cover sizes 2"â120" (DN50âDN3000) and pressure ranges from PN6 / Class 150 up to Class 2500, with metal and soft seat options for water treatment, petrochemical, LNG, shipbuilding and severe service applications.
Design Features & Core Benefits
Triple Offset â Zero-Leakage Metal Seat
Bidirectional triple offset butterfly valves with metal seats provide zero-leakage shutoff, low torque and long life in high-temperature and severe services.
Double Offset â Low Torque Soft Seat
Bi-directional double offset valves with PTFE / RPTFE seats offer low friction, low operating torque and in-line replaceable seats for extended service life.
Concentric â Corrosion-Resistant Rubber Seat
Resilient seated concentric valves with fully rubber-encapsulated bodies suit corrosive and low-pressure services with reduced weight versus gate or globe valves.
ISO 5211 Top Flange & Actuation
Standard ISO 5211 top flange supports lever, gear, pneumatic, electric and hydraulic actuators across all series.
Stem Safety & Low Emission Options
Triple stem sealing, anti-blowout stem design and optional low emission packing help reduce fugitive emissions and improve safety.
In-Line Maintenance & Replaceable Parts
Replaceable seats and in-line maintenance capability reduce downtime and lifecycle cost for critical process lines.
Butterfly Valve Technical Specifications
Size Range
2"â120" (DN50âDN3000) depending on series (Triple Offset, Double Offset or Resilient Seated)
Pressure Rating
ASME Class 150â2500; PN6âPN420 (depending on series and design type)
Temperature Range
-196°C to +600°C (-320°F to +1112°F) per seat material and Offset configuration (Standard, Cryogenic or High-Temp)
Body Materials
Ductile Iron, ASTM A216 WCB, A352 LCC, ASTM A351 CF8/CF8M, CF3/CF3M, Duplex Steel (2205/2507), Monel, Alloy 20
Special Features
Triple/Double offset zero-leakage shutoff; resilient seated concentric options; bi-directional sealing; fire-safe design; ISO 5211 direct mount actuation flange.
End Connections
Wafer, Lug, Flanged RF/RTJ (ASME B16.5 / B16.47), and Butt-weld ends (ASME B16.25).
Design Codes
API 609, ASME B16.34, ISO 5752, API 598, Fire-safe certification (API 607/6FA)
Applications
Reliable performance in Water Treatment, Petrochemical complexes, Refining, LNG terminals, Marine applications, and Air Separation units requiring robust flow control.
Industrial Applications & Services
Water & Wastewater Treatment
Isolation and control for large-diameter water and wastewater lines using concentric and double offset designs.
Petrochemical & Refinery
Triple and double offset valves for process, utility and offsite services in petrochemical and refinery units.
LNG, Air Separation & Cryogenic
Triple offset butterfly valves for high and low temperature services in LNG and air separation plants.
Shipbuilding & Marine
Butterfly valves for ballast, cooling water and process systems on ships and offshore facilities.