Butterfly valves

CONCENTRIC RUBBER LINED BUTTERFLY (BFL)

The shaft is centered on the disc, while the body is lined with elastomers; indeed during the disc rotation, this rubs the valve seat, and to ensure good sealing performances and long life, the seat basically uses rubber or other elastic materials. Cost effective solution with the seal protecting the valve body from the medium, and upon request the disc too, with applications normally for low pressure.

DOUBLE ECCENTRIC BUTTERFLY VALVE (HP)

The rotation center of the disc and the body centerline are twice offset, with the axis of the shaft behind the centerline of the sealing point of the disc to the seat (1st offset), and the axis of the shaft is eccentric to the center of the valve/ pipeline (2nd offset), allowing a quick and easier disengagement of the disc and the seat sealing faces. The design of these butterfly valves guarantees low mechanical wear and deformation between the two sealing faces, making the sealing performance much better and eliminating the unnecessary excessive friction between the disc and seat, reducing torque, improving the service life and controllability. Metal seats can be used thus valves are suitable for higher pressure, temperature and fire resistance services.

TRIPLE ECCENTRIC BUTTERFLY VALVE (QTV)

In addition to the 2 offsets of the double eccentric valve, this valve design shows a 3rd offset, the geometry of the seating surface, creating a type of cone shape of the disc and seat. This cone angle, along with the two eccentric shaft offsets, allows the disc to seal against the seat with no friction. The optimized seat angle minimizes sticking or binding of the disc and lowers valve operating torque. The seat design also allows for uniform sealing, and thus a tight shutoff in a metal seat design.

Triple Offset Butterfly Valves offer several advantages when compared to other valves normally used in most upstream applications. Its Compact design makes the installation easier since the valves provide reductions in weight, thus less pipe bracing is required, and in space, with substantial cost savings, low torque allowing the selection of smaller actuators, thus lowering costs, and are inherently fire safe with a non-rubbing rotation and fire-tested designs per API 607, 5th Edition/ISO 10497-5; moreover bi-directional zero leakage closure with a metal seat, even after extensive cycling, provides sealing integrity formerly associated only with soft-seated valves, providing performance reliability for any harsh conditions in critical process applications, steam isolation, cryogenics and extreme temperatures.