Friction Type SBF

In type D the contact pressure on the seal surface at the flanks, is still higher than optimum, even after the seal width has decreased to half. In the type SBF, one has been able to decrease the seal width and the friction and get closer to an optimum level. A shorter sealing length will result in lower total contact power and, with help of a twisting moment over seal's cross section, a redistribution of the contact pressure so it will be relatively even over the seal width. The capability to establish a hydrokinetic film in both directions and gain a lower friction will increase, at the same time, as transport of the media will be more even in both directions of movements.