Two more variations on the venturi theme are the V-cone and Segmental wedge flow elements.
The V-cone (or “venturi cone,” a trade name of the McCrometer division of the Danaher corporation)
may be thought of as a venturi tube or orifice plate in reverse17: instead of narrowing the tube’s
diameter to cause fluid acceleration, fluid must flow around a cone-shaped obstruction placed in the
middle of the tube. The tube’s effective area will be reduced by the presence of this cone, causing
fluid to accelerate through the restriction just as it would through the throat of a classic venturi
tube: