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High Performance Butterfly Valves use a disc offset from the seat center, hence the name Double Offset.
In this configuration, the disc is eccentric, or offset, from the valve seat. As the disc starts to rotate, it moves away from the seat instead of across it. This design actually uses the line pressure to help give it its seal. This feature allows the use of offset butterfly valves in high‐pressure applications such as ethanol or HVAC. It generally uses PTFE or plastic as its seat material, but metal seats are also available to meet fire‐testing specifications like API 607
ANSI 150, 300, & 600 in all styles
Wafer, Lugged, & Flanged styles
WCB & CF8M bodies stocked
(A broad selection of other materials available)
Blow out proof stem design
Stainless Steel disc & stem standard on stocked trims
TFM 1600 seats are standard, other soft seats are available
Fire Safe & Metal seated versions are available
ISO 5211 mounting is standard. (Direct mount for 12” & smaller, w/ included bracket on larger size)
Class VI / bubble tight bi-directional sealing on all soft seated trims
Dead End service to full pressure rating in preferred direction
Control trim w/ anti-noise & anti-cavitation features available
High Performance Butterfly Valves use a disc offset from the seat center, hence the name Double Offset.
In this configuration, the disc is eccentric, or offset, from the valve seat. As the disc starts to rotate, it moves away from the seat instead of across it. This design actually uses the line pressure to help give it its seal. This feature allows the use of offset butterfly valves in high‐pressure applications such as ethanol or HVAC. It generally uses PTFE or plastic as its seat material, but metal seats are also available to meet fire‐testing specifications like API 607
ANSI 150, 300, & 600 in all styles
Wafer, Lugged, & Flanged styles
WCB & CF8M bodies stocked
(A broad selection of other materials available)
Blow out proof stem design
Stainless Steel disc & stem standard on stocked trims
TFM 1600 seats are standard, other soft seats are available
Fire Safe & Metal seated versions are available
ISO 5211 mounting is standard. (Direct mount for 12” & smaller, w/ included bracket on larger size)
Class VI / bubble tight bi-directional sealing on all soft seated trims
Dead End service to full pressure rating in preferred direction
Control trim w/ anti-noise & anti-cavitation features available
