The Type 48VBF is a single seal that can operate without a cooling water system
(external heat exchanger, API Plan 23) in critical high temperature pumps. In
systems such as boiler feed water (hot, demineralized, deaerated water) for
fossil-fuel steam power plants or within the utilities section of a process plant,
can simplify operations and significantly reduce water consumption.
Marginally cooled or even uncooled, the Type 48VBF can run 20 °C hotter than
competitive solutions, so will run longer in marginal conditions. Using advanced
face technology and assembly techniques, unique “hydropads” allow the seal
faces to remain flat in operation, increasing lubrication efficiency and so enabling
the seal to run cooler.
The 48VBF is an easy upgrade from the existing John Crane 48V seal, requiring
nothing more than changing the primary ring.