Double eccentric Butterfly valve with PTFE sealing-AOBV21
A double offset wafer or lug type butterfly valve suitable for high pressure and high temperature applications.
·All AVANNTO valves are pressure tested to 110% of rated pressure to assure bubble tight shutoff.
·All AVANNTO butterfly valves are pin-less design
·Chemical resistant, weather resistant, abrasion and impact resistant coating
·Internal disc-to-stem connection
·ISO 5211 international compatibility
·Direct mount all AVANNTO actuators including handles, gear operators, pneumatic and electric actuators
Body Materials: Ductile Iron, Carbon Steel, Stainless Steel,Nickel Aluminum Bronze
Disk Materials: Stainless Steel, Nickel Aluminum Bronze
Stem Materials: Stainless Steel, Monel
Seat Materials: RTFE with Resilient Energizer,
Applications: Metallurgy, Power Generation, Chemical Process, Oil & Gas, Pulp & Paper, Bulk Solids, Mining, High Pressure, High Temperature, Critical Service
Material availability depends on valve size & series. Other materials are available. Please consult to us or your local AVANNTO representative for your specific condition.
DN 50 - DN 600
EN 558 Series 20
ISO 5752 Series 20
API 609 Table 1
EN 1092 PN 10/16/25/40 (up to DN 150)
EN 1092 PN 10/16/25 (DN 200 - DN 600)
ASME Class 150
Flange Surface Design:
EN 1092 Form A /B
ASME RF, FF
EN ISO 5211
EN 12266 (Leakage rate A)
ISO 5208, Category 3
-40 °C to + 260°C (depending on pressure, medium and material)
Max. Operating pressure:
max. 40 bar
Double Offset Stem and Disc DesignThe double offset design of the AVANNTO assures reduced seat wear and bi-directional, zero leakage shutoff throughout the full pressure range. At the initial point of disc opening, the offset disc produces a cam–like action, pulling the disc from the seat. This cam–like action reduces seat wear and eliminates seat deformation when the disc is in the open position. When open, the disc does not contact the seat, therefore seat service life is extended and operating torques are reduced. As the valve closes, the cam–like action converts the rotary motion of the disc to a linear type motion to effectively push the disc onto the seat. The wiping action of the disc against the seat prevents undesirable material build-up from slurries or suspended solids.