Straight flow KB type is similar in appearance to the Weir-types; but, it does not include the typical saddle and instead has a straight track. Usually, their membranes are more compact and allow for a longer distance to pass, since the very bottom of the valve must be touched. When the straight-through valve is open, for maximum streamline flow in any direction, the diaphragm lifts high. When the valve is closed, even with coarse or fibrous material in the line, the diaphragm seals tight for positive sealing. These valves must also be repaired because owing to their more compact membranes, their lifetime is normally shorter than Weir-type designs. For slurries, viscous oils, and other conditions, where blocking must be minimized, straight through diaphragm valves are often used. In the beverage industry, the full-bore type of valve is most commonly used. It enables ball-brush cleaning, without opening or removing the valve from the line, with either steam or caustic soda. They are also suitable for bi-directional flow regimes since there is no saddle to avoid the sudden transition from inlet to outlet.